Over the past 150 years of competitive rowing:
- Winning times have decreased by around 25-30%, with the average velocity of boats increasing.
- Physical dimensions of elite rowers have increased, with current average heights around 197cm compared to 173-180cm in the late 19th century.
- Aerobic capacity of elite rowers has also increased significantly, from an estimated maximum of around 5 liters/minute in the 1920s to over 7 liters/minute currently.
- Training methods and volumes have advanced enormously over the decades, with current elite rowers training over 30 hours per week compared to 1-2 hours in the 1860s.
- Improved boat design, equipment, training and
Olympic weightlifting snatch presentation from my 2016/17 Strength and Conditioning placement at the Sports Institute of Northern Ireland (SINI). Includes presentation overview, snatch phases and bar trajectory (first and second pull) etc. Any names of athletes have been replaced with ''Athlete 1'' etc. to maintain confidentiality. I had the presentation sitting on my desktop but they might be a useful starting point for someone studying the area. Feel free to comment.
This is John Grace's slidedeck for the 2016 North Carolina Coaches Clinic in Greensboro, North Carolina. This presentation covers the basics of weight room training design for the Track & Field athlete.
Slides will cover research on general training concepts, research on resistance training for Track & Field athletes, exercise selection, and basics of periodization.
For a sport rated as the number 1 healthiest sport by the Forbes magazine, Squash doesn’t fare as well in popularity except in a few regions around the world. In this UDL, I’ll try to introduce this great game, playing benefits, challenges and the squash circuit in Salt Lake City. Special Attention To- Why squash is not racquetball.
Los relevos, que normalmente se celebran como última prueba en el programa de una
competición, consisten en una disciplina por equipos dentro de un deporte individual como es el
Atletismo.
COMMON ROWING INJURIES
Prevention and Treatment
Jo A. Hannafin, MD, PhD Professor of Orthopaedic Surgery Hospital for Special Surgery, Cornell University Medical College Team Physician, US Rowing FISA Medical Commission
Rowing Rigging practical: Angle changes due to span & inboardrowperfect
An experiment to find what changes in rigging do to catch and finish angles in scull and sweep. Get spreadsheet from http://www.rowperfect.co.uk/?p=12436
Olympic weightlifting snatch presentation from my 2016/17 Strength and Conditioning placement at the Sports Institute of Northern Ireland (SINI). Includes presentation overview, snatch phases and bar trajectory (first and second pull) etc. Any names of athletes have been replaced with ''Athlete 1'' etc. to maintain confidentiality. I had the presentation sitting on my desktop but they might be a useful starting point for someone studying the area. Feel free to comment.
This is John Grace's slidedeck for the 2016 North Carolina Coaches Clinic in Greensboro, North Carolina. This presentation covers the basics of weight room training design for the Track & Field athlete.
Slides will cover research on general training concepts, research on resistance training for Track & Field athletes, exercise selection, and basics of periodization.
For a sport rated as the number 1 healthiest sport by the Forbes magazine, Squash doesn’t fare as well in popularity except in a few regions around the world. In this UDL, I’ll try to introduce this great game, playing benefits, challenges and the squash circuit in Salt Lake City. Special Attention To- Why squash is not racquetball.
Los relevos, que normalmente se celebran como última prueba en el programa de una
competición, consisten en una disciplina por equipos dentro de un deporte individual como es el
Atletismo.
COMMON ROWING INJURIES
Prevention and Treatment
Jo A. Hannafin, MD, PhD Professor of Orthopaedic Surgery Hospital for Special Surgery, Cornell University Medical College Team Physician, US Rowing FISA Medical Commission
Rowing Rigging practical: Angle changes due to span & inboardrowperfect
An experiment to find what changes in rigging do to catch and finish angles in scull and sweep. Get spreadsheet from http://www.rowperfect.co.uk/?p=12436
British Rowing Technique presented in words and images. A clear instruction guide about sculling technique and rowing technique. Thanks to Rowperfect.co.uk for the source.
NOTE there are 2 slides per page = 41 images so use scroll bar not arrow forward or you'll miss half the message.
Rowing ergometers as an aide to on-water training pros and consrowperfect
Ivan Hooper from Australian Institute of Sport gave this presentation about the advantages and disadvantages of training on ergos. They don't replicate the water well, sliders and variable K drag factors and ratings don't match water boat rates.
Rowing Rigging practical: Angle changes due to span & inboardRebecca Caroe
An experiment to find what changes in rigging do to catch and finish angles in scull and sweep. Get spreadsheet from http://www.rowperfect.co.uk/?p=12436
Physiological support for professional boxingalanruddock
The Centre for Sport and Exercise Science, Sheffield Hallam University's approach to sport science support to professional boxers including the world famous Ingle gym.
The almost constant ratio of record speeds for women vs. men elite athletes :...אלין המרמן
Gender Differences in Sport Performance
Running, Swimming, Skating, Rowing, Kayaking, Cycling
sexual dimorphism
ira@mailaps.org
Ira Hammerman
Revava, Israel
Although lightweight rowers can be considered as “small” heavyweight rowers, in reality their respective sports are two different disciplines. Lightweight rowers rely on their ideal body composition and perfect technique, while heavyweights on the other hand are characterized more by their general strength capabilities.
Maximal incremental tests might not be the best solution to monitor changes in performance after high-volume, low-intensity training period as a rower spends only 20-30% of the time during the incremental tests at low intensities.
Therefore, if a training period was intended to stress the low intensity energy systems then the measurement validity would be higher if we test the athlete using similar intensities.
Abstract
Purpose: The purpose of this pilot study was to develop test methodology that would allow for an estimation of the relative contributions of buoyancy and hydrodynamics on swim performance.
Methods: One trained swimmer completed three familiarization trials followed by eighteen randomized swim sessions where each condition no wetsuit (NS), low buoyancy wetsuit (LBW), high buoyancy wetsuit (HBW), NS plus pull buoy (NSB), and HBW matched to buoy buoyancy (HBW+) were tested four times each. Buoyancy for all conditions was measured via hydrostatic weighing system. All data are presented as means+SD and change scores (95% CI).
Results: Coefficients of variations with each condition were about 2%. DB decreased by 2.29% for LBW, 2.80% for HBW, 1.93% for NSB, and 1.96% for HBW+, which resulted in an increase in buoyancy lift force. LBW and HBW improved 800-yd swim times over NS -70.6 (-86.2, -55.0) sec, and -69.1 (-84.0, -54.3) sec, respectively. Swim times for 100-yd were also similar between LBW, -9.4 (-10.7, -8.1) sec, and HBW, -7.9 (-11.4, -4.5) sec. Neither stroke rate nor total strokes differed between LBW and HBW, though both appeared significantly lower than NS. In HBW+ trials, the difference in 800- yd and 100-yd times between NSB and NS was -25.2 (-60.3, 10.0) and -1.7 (-19.6, -16.3), respectively, while HBW+ vs NSB 800-yd and 100-yd time differences were -26.6 (-28.3, -24.9) and -5.7 (18.9, 7.5).
Conclusion: The outlined protocol can produce reliable results. These data support earlier assertions that buoyancy may reach a point of diminishing returns, and also indicate that wetsuit hydrodynamics play larger role in swim performance as velocity increases. The protocol outlined could aid in optimal wetsuit design without the need for advanced testing equipment.
Anaerobic power is a physiological factor dominating 2000 m rowing race during the start and the finish. Anaerobic capacity relies on carbohydrate availability, therefore lower glycolytic capacities may be of negative effect at the start acceleration and the final spurt in the rowing race.
Barrero, A., Carrasco, M., Irurtia, A., Chaverri, D., Iglesias, X., Rodríguez, F.A. Energy balance during an ultra-endurance triathlon. 18th Annual Congress of the European College of Sport Science, INEFC Barcelona. (Barcelona).
Presentation examining the track and field events from a strength coach's perspective. Part of a presentation I did at the 2013 Australian Track and Field Coach's Association's Coaching Congress.
VO2max (maximal oxygen consumption) refers to the amount of oxygen that can be consumed within 1 minute – this value has been called the absolute VO2max and this parameter is one of the highest in rowers among other sport disciplines.
24 9153 adjusting the origin of buoyancy edit satIAESIJEECS
Surf-riding actions in reliable attractive following oceans for cases with a variety of LCBs and
Froude information are mimicked utilizing the numerical model. Comes concerning display that the surfriding
can't be forestalled by the modify of LCB. Be that as it may, it happens with an upper limit
momentum when ship's focal point of lightness (COB) is stimulated towards stem contrasted with affecting
towards stern, which is for the majority part since the distinctions on wave resistance brought concerning
by the changing of LCB.
Definition : The ability to carry out daily tasks with alertness, without undue fatigue, and with ample energy to enjoy leisure-time pursuits and meet unforeseen emergencies.
Purpose of Fitness Testing:
Educating participants about their present health status relative to health-related standards , age , gender.
Providing data that are helpful in development of exercise prescription.
Collecting baseline and follow-up data that allow evaluation of progress by exercise program .
Motivating participants by establishing reasonable and attainable fitness goals.
Satisfying cardiovascular risk.
Components of Physical fitness are : Health related physical fitness component and Skill related physical fitness component. Health related physical fitness components include cardiorespiratory endurance , body composition, muscle strength, muscle endurance , flexibility and Skill related physical fitness components include Agility, power, coordination , balance, reaction time, speed.
Serbia vs England Tickets: Serbia Prepares for Historic UEFA Euro 2024 Debut ...Eticketing.co
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Belgium coach Domenico Tedesco will wait for several key players to recover from injury. Even if it means they miss the opening Euro Cup Germany stages of the European Championship in Germany this month. Veteran defender Jan Vertonghen, midfielder Youri Tielemans and defender Arthur. Theate are being given time to play in the tournament because they are considered vital to Belgium’s cause, Tedesco said on Tuesday.
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"Of course, you prefer to take players who are fully fit, but that's okay. We want to wait and be patient for some players even if they cannot play in those first matches," he told a press conference. The 37-year-old Vertonghen, Belgium’s Euro Cup 2024 most-capped international with 154 appearances, is struggling to shake off a groin injury.
"He will be there normally. This also applies to Youri Tielemans and Arthur Theate. The latter's position is very sensitive. We don't have many choices at left back. "It will only change if it turns out that they will only be available when, say, the final of the Euro 2024 Championship comes around. That's too long to wait. "However, I am confident that the injured boys are on track for the Euros.
Belgium vs Romania: Radu Dragusin Prepares for Crucial Role in Euro Cup Germany
Some of them have taken not one but two steps forward in their rehabilitation," he said. None of the injured players will feature in this week’s warm-up friendlies against Montenegro and Luxembourg. Romania centre-back Radu Dragusin found chances limited at Tottenham Hotspur in the second half of the 2023-24 season.
But is crucial to his country's cause at UEFA Euro 2024 where his aerial ability, physicality and hard graft make him a standout player. The 22-year-old moved to North London from Italian side Genoa in January but was kept on the sidelines by the form of another new arrival for the season, Mickey van de Ven, something Romania coach Edward Iordanescu admitted was a concern.
It will mean limited game-time going into the finals, but Dragusin, who cites Netherlands defender Virgil van Dijk as a role model, started every Euro Cup Germany qualifier as Romania went through the campaign unbeaten in their 10 games. He will be among their most important players in their first game in Germany against Ukraine in Munich on June 17, taking the right centre-back role in what is likely to be a back four.
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Narrated Business Proposal for the Philadelphia Eaglescamrynascott12
Slide 1:
Welcome, and thank you for joining me today. We will explore a strategic proposal to enhance parking and traffic management at Lincoln Financial Field, aiming to improve the overall fan experience and operational efficiency. This comprehensive plan addresses existing challenges and leverages innovative solutions to create a smoother and more enjoyable experience for our fans.
Slide 2:
Picture this: It’s a crisp fall afternoon, driving towards Lincoln Financial Field. The atmosphere is electric—tailgaters grilling, fans in Eagles jerseys creating a sea of green and white. The air buzzes with camaraderie and anticipation. You park, join the throng, and make your way to your seat. The stadium roars as the Eagles take the field, sending chills down your spine. Each play is a thrilling dance of strategy and skill. This is what being an Eagles fan is all about—the joy, the pride, and the shared experience.
Slide 3:
But now, the day is marred by frustration. The excitement wanes as you struggle to find a parking spot. The congestion is overwhelming, and tempers flare. The delays mean you miss the pre-game excitement, the tailgate camaraderie, and even the opening kick-off. After the game, the joy of victory or the shared solace of defeat is overshadowed by the stress of navigating out of the parking lot. The gridlock, honking horns, and endless waiting drain the energy and joy from what should have been an unforgettable experience.
Our proposal aims to eliminate these frustrations, ensuring that from arrival to departure, your experience is extraordinary. Efficient parking and smooth traffic flow are key to maintaining the high spirits and excitement that make game days special.
Slide 4:
The Philadelphia Eagles are not just a premier NFL team; they are an integral part of the community, hosting games, concerts, and various events at Lincoln Financial Field. Our state-of-the-art stadium is designed to provide a world-class experience for every attendee. Whether it's the thrill of game day, the excitement of a live concert, or the camaraderie of community events, we pride ourselves on delivering a fan-first experience and maintaining operational excellence across all our activities. Our commitment to our fans and community is unwavering, and we continuously strive to enhance every aspect of their experience, ensuring they leave with unforgettable memories.
Slide 5:
Recent trends show an increasing demand for efficient event logistics. Our customer feedback has consistently highlighted frustrations with parking and traffic. Surveys indicate that a significant number of fans are dissatisfied with the current parking situation. Comparisons with other venues like Citizens Bank Park and Wells Fargo Center reveal that we lag in terms of parking efficiency and convenience. These insights underscore the urgent need for innovation to meet and exceed fan expectations.
Slide 6:
As we delve into the intricacies of our operations, one glaring issue emer
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150 Years of Rowing Faster!
1. 150 Years of Rowing150 Years of Rowing
Faster!Faster!
Stephen Seiler PhD FACSMStephen Seiler PhD FACSM
Faculty of Health and SportFaculty of Health and Sport
Agder University CollegeAgder University College
Kristiansand, NorwayKristiansand, Norway
2. Oxford-Cambridge Boat Race
Winning Times 1845-2005
y = -0,0331x + 83,872
R
2
= 0,6153
14
16
18
20
22
24
26
28
1845 1865 1885 1905 1925 1945 1965 1985 2005
Year
Time (min)
3. FISA Men’s championship 1x
Winning Times 1894-2004
y = -0,0137x + 34,292
R
2
= 0,5434
6
6,5
7
7,5
8
8,5
9
9,5
1890 1910 1930 1950 1970 1990 2010
Year
Time (min)
4. 25-30% increase
in average velocity over 150 years
of competitive rowing
What are the performance variables and
how have they changed?
How will future improvements
be achieved?
5. Decrease
Power
Losses
Decrease
Drag Forces
on Boat
Increase Propulsive
Efficiency
of oar/blade
Improve
Technical
Efficiency
Increase
Propulsive
Power
Aerobic
Capacity
Anaerobic
Capacity
Maximal
Strength
Increased
Physical
Dimensions
Improved
Training
6. ””Evolutionary Constraints”Evolutionary Constraints”
• Race duration ~ 6-8 minutes
• Weight supported activity
• Oar geometry dictates relatively low cycle
frequency and favors large stroke distance
to accelerate boat
• High water resistance decelerates boat
rapidly between force impulses
7. These constraints result in:These constraints result in:
• High selection pressure for height and arm
length
• High selection pressure for absolute
(weight independent) aerobic capacity
• Significant selection pressure for muscular
strength and anaerobic capacity
8. Ned Hanlan ca 1880
173cm
71kg
Biglin Brothers ca 1865
180cm? 75-80kg? Ward Brothers ca 1865
185cm?
80+kg?
9. ””Since the 19th century there have beenSince the 19th century there have been
clearly documented secular trends toclearly documented secular trends to
increasing adult height in most Europeanincreasing adult height in most European
countries with current rates of 10-countries with current rates of 10-
30mm/decade.”30mm/decade.”
Cole, T.J. Secular Trends in Growth. Proceedings
of the Nurition Society. 59, 317-324, 2000.
10. Redrawn after data from Fredriks et al, in Cole, T.J. Secular Trends in Growth.
Proceedings of the Nutrition Society. 59, 317-324, 2000.
165
170
175
180
185
190
195
200
Height (cm)
1965 1980 1997
Males
Females
97th percentile for height in Dutch
21 year-olds
11. Oxford Crew-2005
Average Height: 197cm
Average bodyweight
98.3 kg
Taller Population= Taller Elite RowersTaller Population= Taller Elite Rowers
12. Scaling problems- Geometry orScaling problems- Geometry or
fractal filling volumes?fractal filling volumes?
Based on Geometric scaling:
Strength and VO2max will increase in
proportion to mass 2/3
.
BUT, Metabolic rates of
organisms scale with
mass3/4
.
See: West, G.B et al A general model for the
origin of allometric scaling laws in biology.
Science 276 122-126, 1997.
13. VOVO22 body massbody mass
scaling in elite rowersscaling in elite rowers
Relationship between maximal
oxygen uptake and body mass for
117 Danish rowers
(national team candidates)
From: Jensen, K., Johansen, L, Secher, N.H.
Influence of body mass on maximal oxygen
uptake: effect of sample size. Eur. J. Appl. Physiol.
84: 201-205, 2001.
r = - 0.39
A key finding of this study was that VO2 scaled with body mass
raised to the =.73 power, or close to the 0.75 value predicted
by metabolic scaling
14. Measuring Rowing Specific Physical Capacity
Photo courtesy of Mathijs Hofmijster, Faculty of Human
Movement Sciences, Free University Amsterdam, Netherlands
15. photos 1-4 from Miller, B. ”The development of rowing
equipment” http://www.rowinghistory.net/equipment.htm
1.
2.
3.
4.
5.
16. The Maximum of HumanThe Maximum of Human
Power and its FuelPower and its Fuel
From Observations on the YaleFrom Observations on the Yale
University Crew, Winner of the OlympicUniversity Crew, Winner of the Olympic
Championship, Paris, 1924Championship, Paris, 1924
Henderson, Y and Haggard, H.W. American J. Physiology. 72, 264-282, 1925
Height: 185 cm
Weight: 82 kg
Crew average:
17. Estimated external work required
at racing speed based on:
1. Boat pulling measurements
2. Work output on a rowing
machine
3. Rowing ergometer VO2
measurements (but did not go
to max)
Estimated an external work requirement
of ~6 Calories/min or (assuming 20%
efficiency)
30 Calories/min energy expenditure.
Equals ~ 6 Liter/min O2 cost
Assumed 4 L/min VO2 max and 2 L/min
anaerobic contribution during 6 min race.
The ergometer of the day had to be redesigned to
allow a quantification of work and power.
18. 1970s - VO1970s - VO22 max vs boat placementmax vs boat placement
in international regattain international regatta
From Secher NH. Rowing.
Physiology of Sports
(ed. Reilly et al)
pp 259-286. 1971
Even if we assume 5 liter/min
max for the dominant,
champion 1924
crew, they would have been at
the bottom of the international
rankings 50 years later, as this
team boat VO2 max data
compiled by Secher
demonstrates.
19. 193 cm, 92 kg 6.23 L/min VO2 cycling.
Subject reached 6.1 to 6.4 L/min during
repeated testing in different boats.
Jackson, R.C. and N. H. Secher.
The aerobic demands of rowing in
two Olympic rowers. Med. Sci.
Sports Exerc. 8(3): 168-170, 1976.
This study was unique because 1) on water measurements were made
of champion rowers and, 2) the authors of the paper WERE the
Champion rowers (Niels Secher, Denmark and Roger Jackson, Canada)
who went on to very successful sport science careers.
20. Aerobic Capacity Developments ?Aerobic Capacity Developments ?
Dr. Fred Hagerman
X
3
3,5
4
4,5
5
5,5
6
6,5
7
1860 1910 1960 2010
Year
VO2max(L/min)
?
?
■
7+
L/min
Ohio University
? There is just not much
data available prior to the
late 60s, so the question
marks emphasise that
this is guessing. But that
aerobic capacity has
increased Is clear. Today,
isolated 7 liter values VO2 max
values have been recorded in
several good laboratories for
champion rowers.
21. 6.3 L/min, 75 kg,
85 ml/kg/min
270 ml/kg0.73
/min
”Typical World Class”
XC skiers
7.5 L/min, 95kg, (do they exist?)
79 ml/kg/min,
270 ml/kg0.73
/min
Allometrically equivalent rower?
?
22. How much of performance improvement isHow much of performance improvement is
attributable to increased physical dimensions?attributable to increased physical dimensions?
2%
4%
0
1
2
3
4
5
6
Lightweight Heavyweight
Velocity(m/s)
Males
Females
Based on W Cup results
from Lucerne over:
• 3 years
• 3 boat types
• 1st 3 places
Here I use present day differences
in boat velocity for world class
lightweight and heavyweight crews
to demonstrate that the massive
scale up in body size has not
resulted in a proportional
increase in boat speed, due to
increased power losses associated
with greater boat drag. The
difference between these two
weight classes today is about the
same as the increase in body size
observed over 150 years
23. Rise at 7 a.m: Run 100-200
yards as fast as possible
About 5:30: Start for the river and row
for the starting post and back
Reckoning a half an hour in rowing to and
half an hour from the starting point, and a
quarter of an hour for the morning run- in all,
say, one and a quarter hours.
24. US NationalUS National
Team trainingTeam training
during peakduring peak
loading periodloading period
3 sessions/day
30+ hr/wk
From US
Women’s
national team
1996
Mon 8:00 Weights 120 min
10:00 Row 70 min Steady state in pairs HR 144-148
4:00 Row 100 min Steady state in pairs HR 140-144
Tues 8:00 Row 2 x 5x5 min ON/1 min OFF in
pairs
HR 180-185
10:30 Erg 12 kilometers HR 150
4:00 Row 100min Steady state in eight
Wed 8:00 Weights 120 min
10:00 Run 3 x 10 laps 160-175
4:00 Row 100min steady in eight 140-148
Thurs 8:00 Row 2 sets 12 x 20 power strokes in
eight
10:30 Erg 75 min (about 17500m) 140-148
4:00 Erg 3 x 20 min 140-148
Fri 8:00 Weights 120 min
10:30 Erg 15 km 140-160
3:30 Row 90 min steady state in eight 144-170
Sat 9:00 Row 90 min steady state in eight 140-160
3:00 Row 90 min steady state in four 144-170
Sun 9:00 Row 3 sets 4 x 4 min ON/1 min OFF
in pairs
180-190
25. Developments in training over last 3Developments in training over last 3
decadesdecades
0
5
10
15
20
25
70s 80s 90s
hours
.
wk
-1
Winter
Summer
924 hrs.
yr-1
966 hrs.
yr-1
1128 hr.
yr-1
5.8 l.
min-1
6.4 l.
min-1
6.5 l.
min-1
Fiskerstrand A, Seiler KS
Training and performance
characteristics among
Norwegian international rowers
1970-2001. Scand J Med Sci
Sports. 2004 (5):303-10.
26. Developments in training over last 3Developments in training over last 3
decadesdecades
0
10
20
30
40
50
60
Training
hours/
month
70s 80s 90s
Basic endurance
High intensity
Fiskerstrand A, Seiler KS
Training and performance
characteristics among
Norwegian international
rowers 1970-2001. Scand J
Med Sci Sports. 2004
(5):303-10.
27. 1860s - ”Athletes Heart” debate1860s - ”Athletes Heart” debate
beginsbegins
• 18671867- London surgeon F.C. Shey- London surgeon F.C. Shey likened The Boat Race
to cruelty to animals, warning that maximal effort for 20, warning that maximal effort for 20
minutes could lead to permanent injury.minutes could lead to permanent injury.
• 18731873- John Morgan (physician and former Oxford crew- John Morgan (physician and former Oxford crew
captain) compared 251 former oarsmen with non-rowerscaptain) compared 251 former oarsmen with non-rowers
-concluded that the rowers had lived 2 years longer!-concluded that the rowers had lived 2 years longer!
• Myocardial hypertrophy was key topic of debate, butMyocardial hypertrophy was key topic of debate, but
tools for measurement (besides at autopsy) were not yettools for measurement (besides at autopsy) were not yet
available.available.
See: Park, R.J. High Protein Diets, ”Damaged Hearts and Rowing Men: antecendents of
Modern Sports Medicine and Exercise Science, 1867-1928. Exercise and Sport Science
Reviews, 25, 137-170, 1997.
See also: Thompson P.D. Historical aspects of the Athletes Heart. MSSE 35(2), 364-370
2003.
28. Big-hearted Italian Rowers - 1980sBig-hearted Italian Rowers - 1980s
• Of 947 elite Italian athletes tested, 16 had
ventricular wall thicknesses exceeding normal
criteria for cardiomyopathy. 15 of these 16 were
rowers or canoeists (all international medalists).
• Suggested that combination of pressure and
volume loading on heart in rowing was unique,
but adaptation was physiological and not
pathological.
from: Pelliccia A. et al. The upper limit of physiologic cardiac hypertrophy
in highly trained elite athletes. New England J. Med. 324, 295-301, 1991.
29. From: Pelliccia et al. Global left ventricular shape is not altere
as a consequence of physiologic remodelling
in highly trained athletes. Am. J. Cardiol. 86(6), 700-702, 2000
elite rower
untrained control
These ultrasound images show the
hypertrophied but geometrically similar
heart of an elite Italian rower compared to
the smaller heart of an untrained subject.
30. Pelliccia et al. Remodeling of Left Ventricular
Hypertrophy in Elite Athletes After Long-Term
Deconditioning Circulation. 105:944, 2002
Myocardial adaptation to
heavy endurance training was
shown to be reversed with
detraining.
The functional and
morphological changes
described as the
”Athlete’s Heart” are
adaptive, not pathological.
31. Force production andForce production and
strength in rowingstrength in rowing
• Ishiko used strain gaugeIshiko used strain gauge
dynamometers mounted ondynamometers mounted on
the oars of the silver medalthe oars of the silver medal
winning 8+ from Tokyo 1964winning 8+ from Tokyo 1964
to measure peak dynamicto measure peak dynamic
forces.forces.
• Values were of theValues were of the
magnitude 700-900 N basedmagnitude 700-900 N based
on the figures shownon the figures shown
Ishiko, T. Application of telemetry to sport activities. Biomechanics.
1:138-146, 1967.
Photo from WEBA sport GMBH
32. 1971 - Secher calculated power
to row at winning speed in 1972
championships = 450 watts (2749
kpm/min)
”In accordance with the force-
velocity relationship a minimal
(isometric) rowing strength of 53 ÷
0.4 = 133 kp (1300N) will be
essential.”
From: Secher, N.H. Isometric rowing strength of
experienced and inexperienced oarsmen.
Med. Sci. Sports Exerc.7(4) 280-283, 1975.
How Strong do Rowers
need to be?
33. Force production and rowingForce production and rowing
strengthstrength
From: Secher, N.H. Isometric rowing strength of
experienced and inexperienced oarsmen.
Med. Sci. Sports Exerc.7(4) 280-283, 1975.
Measured isometric force in
7 Olympic/world medalists,
plus other rowers and
non-rowers
Average peak isometric force
(mid-drive): 2000 N
in medalists
NO CORRELATION
between ”rowing strength”
and leg extension, back
extension, elbow flexion, etc.
34. Decrease
Power
Losses
Decrease
Drag Forces
on Boat
Increase Propulsive
Efficiency
of oar/blade
Improve
Technical
Efficiency
Increase
Total Propulsive
Power
Aerobic
Capacity
Anaerobic
Capacity
Maximal
Strength
Physical
Dimensions
?
Improved
Training
?
36. 3
4
5
6
7
8
9
10
11
12
13
14
15
3 3.5 4 4.5 5 5.5 6 6.5 7
1x Boat Velocity (m/sec)
OxygenDemand(l/min)
Boat Velocity – Oxygen Demand Relationship
Boat velocity
range for Men’s
and women’s 1x
This figure shows that achieving a 10% increase in average boat velocity
would require an impossibly large increase in aerobic capacity. This
means that any revolutionary boat velocity increases in the future must be
achieved by decreasing power losses (boat drag for example).
37. Drag Forces on the Boat andDrag Forces on the Boat and
RowerRower
• Boat Surface DragBoat Surface Drag - 80% of- 80% of
hydrodynamic drag (depends onhydrodynamic drag (depends on boatboat
shapeshape andand total wetted surface areatotal wetted surface area))
• Wave drag contribution smallWave drag contribution small - <10%- <10%
of hydrodynamic dragof hydrodynamic drag
• Air resistanceAir resistance – normally <10% of– normally <10% of
total drag, depends on cross-total drag, depends on cross-
sectional area of rowers plus shellsectional area of rowers plus shell
38. In-rigged wherry
typical of those
used in racing
prior to 1830
figures from Miller, B. ”The development of rowing equipment”
http://www.rowinghistory.net/equipment.htm
39. All radical boat form improvementsAll radical boat form improvements
completed by 1856.completed by 1856.
• 1828-1841. Outrigger tried by
Brown and Emmet, and perfected
by Harry Clasper
• Keel-less hull
developed by William
Pocock and Harry
Clasper 1840-1845
• Thin-skin applied to keel-less frame
by Matt Taylor- 1855-56
photo and timeline from Miller, B. ”The development of rowing
equipment” http://www.rowinghistory.net/equipment.htm
• Transition to epoxy and carbon fiber
boats came in 1972. Boat weight of
8+ reduced by 40kg
40. Effect of reduction inEffect of reduction in Boat WeightBoat Weight
on boat velocityon boat velocity
ΔV/V = -(1/6) Δ M/Mtotal
Example: Reducing boat+oar weight from
32 to 16kg = 2.4% speed increase for 80 kg
19th century rower.
From: Dudhia, A Physics of Rowing.
http://www-atm.physics.ox.ac.uk/rowing/physics/
V= boat velocity
M = Mass
ΔV= Change in Velocity
ΔM= Change in Mass
41. To achieve a radical reduction in drag forces
on current boats, they would have
to be lifted out of the water!
42. To run this video, download it to the same directory from http://sportsci.org/2006/flyak.wmv (7.4 MB)
Video of a hydrofoil kayak with two submerged wings. See http://www.foilkayak.com/
44. Oar movement translates rowerOar movement translates rower
power to boat velocitypower to boat velocity
Figure from:
Baudouin, A. &
Hawkins D.
A biomechanical
review of factors
affecting rowing
performance. British
J. Sports Med. 36:
396-402
Boat
Travel
45.
46. The slide properly used is a decided
advantage and gain of speed, and only
objection to its use is its complication and
almost impracticable requirement of skill
and unison in the crew, rather than any
positive defect in its mechanical theory.
J.C. Babcock 1870
1876 Centennial Regatta, Philadelphia,
Pennsylvania. London Crew winning heat
47. Photo from www.concept2.com
Boat direction
From: Nolte, V. Die Effektivitat des ruderschlages. 1984
in: Nolte, V ed. Rowing Faster. Human Kinetics, 2005
A common conception of the oar blade-water connection is that it is
solid, but it is not. Water is moved by the blade. Energy is wasted in
moving water instead of moving the boat as the blade “slips”
through the water. Much or oar development is related to
improving blade efficiency and decreasing this power loss. However,
the improvement has been gradual, in part due to technological
limitations in oar construction.
48. Oar hydrodynamic efficiency- propellingpropelling
the boat but not the waterthe boat but not the water
E hydro = Power applied rower – Power loss moving water
Power applied rower
Oar power loss = blade drag force * blade velocity (slip)
Power applied = Force Moment at the oar * oar angular velocity
Affeld, K., Schichl, Ziemann, A.
Assessment of rowing efficiency Int. J.
Sports Med. 14 (suppl 1): S39-S41, 1993.
50. Affeld, K., Schichl, Ziemann, A. Assessment of rowing efficiency
Int. J. Sports Med. 14 (suppl 1): S39-S41, 1993.
Big blades found
to be 3% more
hydrodynamically
efficient compared
to Macon blade
?
52. Effect of Improved Oars on boatEffect of Improved Oars on boat
speed?speed?
• Kleshnev (2002) used instrumented boats and
measurement of 21 crews to estimate an 18%
energy loss to moving water by blade
• Data suggests 2-3% gain in boat velocity possible
with further optimization of oar efficiency (30-50% of
the present ~ 6 % velocity loss to oar blade energy
waste)
55. Larger fluctuations
require greater
propulsive power for
same average
velocity
Decreasing Velocity
Fluctuations
Figure from Affeld et al. Int. J.
Sports Med. 14: S39-S41, 1993
Sources
• Pulsatile Force application
• Reactions to body mass
acceleration in boat
56. The Sliding RiggerThe Sliding Rigger
1954 Sliding Rigger developed
by C.E. Poynter (UK)
From: Miller, B. The development of Rowing Equipment. http://www.rowinghistory.net
• Idea patented in 1870s
• Functional model built in
1950s
• Further developed by Volker
Nolte and Empacher in early
1980s
• Kolbe won WCs in 1981 with
sliding rigger
• Top 5 1x finalists used sliding
rigger in 1982.
• Outlawed by FISA in 1983.
The sliding rigger was outlawed on the basis of its high cost (an unfair
advantage). This argument would not be true today with modern
construction methods.
57. How much speed could be gained byHow much speed could be gained by
reducing velocity fluctuations by 50%?reducing velocity fluctuations by 50%?
• Estimated ~5% efficiency loss due to velocity
fluctuations (see Sanderson and Martindale
(1986) and Kleshnev (2002)
• Reducing this loss by 50% would result in
a gain in boat velocity of ~ 1% or ~4
seconds in a 7 minute race.
• Sliding rigger effect probably bigger!
due to decreased energy cost of rowing and
increased stability (an additional 1%+ ?)
58. Better Boat Balance?Better Boat Balance?
0.3 to 0.5 degrees
50% of variability attributable
to differences in rower mass
0.1 to 0.6 degrees.
0.5 degrees = 2.5 cm
bow movement
0.3 to 2.0 degrees.
Highest variability
between rowers here
Smith, R. Boat orientation and skill level in sculling boats. Coaches
Information Service http://coachesinfo.com/
59. The Rowing Stroke Force Curve-The Rowing Stroke Force Curve-
A unique signatureA unique signature
From: Ishiko, T. Biomechanics of Rowing. Medicine and Sport
volume 6: Biomechanics II, 249-252, Karger, Basel 1971
”Oarsmen of a
crew try to row in
the same manner
and they believe
that they are
doing so. But
from the data it
may be concluded
that this is actually
not true.”
60. From Schneider, E., Angst, F. Brandt, J.D. Biomechanics
of rowing. In: Asmussen and Jørgensen eds.
Biomechanics VI-B Univ. Park Press, Baltimore, 1978.
pp 115-119.
A ”Good Crew”
”A new crew with visible success”
2 juniors with ”only 1 year experience
in the same boat”
Rowers 1 and 2 have very similar force curves, showing that the
timing of blade forces in the two rowers is well matched. Rowers
3 and 4 are quite different from 1 and 2, reaching peak force
earlier in their stroke. They are similar to each other though,
perhaps explaining their ”visible success”. Rowers 7 and 8 show
markedly different stroke force profiles, with rower 7 reaching
peak force late in the stroke.
61. From: Wing, A.M. and Woodburn, C. The
coordination and consistency of rowers in a
racing eight. Journal of Sport Sciences. 13,
187-197, 1995
Rowing Together: Synchronizing forceRowing Together: Synchronizing force
curvescurves
Fatigue changes the amplitude
of the curve, but not its shape.
Changing rowers in the boat
did not change the force curves
of the other rowers, at least not
in the short term.
62. Is there an optimal force curve?Is there an optimal force curve?
• For a 1x sculler: perhaps yes, one thatperhaps yes, one that
balances hydrodynamic and physiologicalbalances hydrodynamic and physiological
constraints to create a personal optimum.constraints to create a personal optimum.
• For a team boat: probably no singleprobably no single
optimum exists due to interplay betweenoptimum exists due to interplay between
biomechanical and physiologicalbiomechanical and physiological
constraints at individual level.constraints at individual level.
see also: Roth, W et al. Force-time characteristics of the rowing stroke and corresponding
physiological muscle adaptations. Int. J. Sports Med. 14 (suppl 1): S32-S34, 1993
63. Contribution of rowing variables to
increased velocity over 150 years
Increased Physical
Dimensions - 10%
Improved
Training – 33%
Improved Boat Design
/reduced dead weight – 12%
Improved hydrodynamic
efficiency of oar – 25%
Sliding Seat/Evolved Rowing
Technique – 20%
This is my best estimate of the relative contribution of the different performance variables
addressed to the development of boat velocity over 150 years. Future improvements are probably best
achieved by further developments in oar efficiency, and perhaps the return of the sliding rigger!
Good afternoon.
The nice thing about giving a talk on a narrow topic like this during the afternoon session is that you can be fairly certain who your audience is. So, welcome ACSM rowers!
With a title like this, there are a number of different paths one can take. I have chosen to follow this one:
This talk will focus on the evolution of rowing performance that is
depicted in the next two slides. Here we see the Oxford Yale boat race results since 1845, when the distance became standardized.
At the other end of the rowing boat type spectrum, here is data from the men’s 1x, where world championships have been contested under the organization of the International Rowing Federation FISA, since 1893.
Unfortunately, similar data over such a long time frame are not available for women’s rowing, so I apologize for the gender bias in this talk. However, every conclusion I will draw is applicable to both males and females.
Two points emerge from the figures I just showed you:
Performance improvements have been essentially continuous for 150 years and
The rate of improvement in rowing performance is approximately 2% per decade for men.
So, with that historical reference frame, what are the performance variables and how have they changed?
The rower wishing to improve his or her velocity over 2000m must 1) increase propulsive power and/or 2) decrease power losses.
On the left side of the equation, increasing propulsive power may involve increasing aerobic capacity, increasing anaerobic capacity, or possibly increasing muscular strength. In turn, changes in these characteristics over time in the elite rowing population might be attributable to changes in the physical dimensions of the athletes, and/or changes in training.
On the power loss side of the equation, I have chosen to organize power losses in terms of three basic sources of inefficiency in converting mechanical power to boat velocity: 1) drag forces on the boat, 2) inefficiencies at the oar/water connection associated with hydrodynamics and oar design, and 3) ”technical efficiency” which we might summarize as being all those aspects of rowing performance that rowing on an ergometer tells one little, or nothing about.
Let’s set the stage by establishing the ”evolutionary constraints” if you will that might influence athlete selection.
These constraints result in selection pressure for a specific type of athlete:
Here are a number of rowing champions of the period 1860s to 1880s.
Ned Halan, the Canadian world champion, was a bit small even for rowers of the day at 173cm and 71 kg. The champion crews the Biglin brothers and Ward Brothers were somewhat larger and probably above average in height for the era, but it seems safe to guess that they were not larger than 180-185cm and 75-85 kg
Since that time, the populations of all ”rowing nations” have become taller and heavier. Cole summarizes a large number of studies and concludes that adult height has increased by 1 to 3 cm per decade for over a century.
And, as these data indicate, the most important thing about a rightward shift in the normal distribution for height from the coach’s perspective is that there will be more unusually tall males and females walking around waiting to be directed to the nearest boathouse.
So our 175 to 185 cm tall champions of the late 19th century have evolved into the 190 to 2m tall elite oarsmen of today. The 19th century champion Ned Hanlan would likely have been confused with the coxwain in this crowd.
But it is not height that propels the boat, but physical capacity and power.
Does physical capacity scale directly with an increase in physical dimensions?
Biologists will quickly tell us that it does not. But what is the correct scaling factor?
Jensen et al recently put allometric scaling laws to the test in 117 national class rowers from Denmark. The top panel shows absolute VO2 max in liters/min as a function of body mass. The middle panel shows how VO2 max per kg body weight actually goes down with increasing body mass. Finally, the lower panel shows VO2 max scaled with body mass to the 0.73 power in these athletes.
These data support the concept of a ¾ power scaling law for the body mass to aerobic capacity relationship
Today, we have valid reliable ergometers that allow measurement of physical capacity that is reasonably rowing specific. However, training and measuring rowing capacity off the water is not a recent development.
Already by 1870 a rowing machine design was presented and numerous rowing simulators and ergometers have appeared over time. However, up until the 60s, no production rowing ergometer was designed to accurately quantify work rate, or power.
Because accurate ergometry was lacking, and on water experiments were impractical without telemetry, few studies of rowers and their physical capacity exist prior to the 60s.
I would encourage all of you rowing physiologists out there to buy this classic article from the American Physiological Society. Henderson and Haggard investigated a group of world class performers of the day and highlighted a number of challenges associated with testing high performance athletes that resonate still today.
They also described, over 85 years ago, essentially all the rowing performance variables that remain in focus today.
This undefeated and quite dominant team averaged 186 cm and 82kg by the way.
Henderson and Haggard attacked both sides of the energy balance equation, measuring both drag forces on a loaded boat pulled at racing speeds, and mechanical and metabolic power associated with rowing on a rowing ergometer of their own design that allowed them to quantify work output. It was probably an adaptation of the ergometer shown here, which could not be used to quantify work output. Unfortunately, for a number of reasons, both technical and practical , they did not perform MAXIMAL tests on these athletes and were probably influenced by prevailing views of the day that the maximum oxygen consumption for humans was 4 liters /min.
Based on the 6 liter min equivalent oxygen cost they arrived at, and a more reasonable anaerobic contribution of 15% of energy cost, these athletes might have averaged closer to 5 L/min VO2 max.
Even with modern equipment, their physical capacity would not have been sufficient for the 1924 gold medalists to number among the top 10 boats in an international final 50 years later, as these data compiled by Niels Secher demonstrate.
If we jump forward about 50 years after Henderson and Haggard’s work to 1976, another study on the physical capacity of world class rowers deserves some specific mention.
It is not uncommon for exercise physiologists to convince world class athletes to be tested in their laboratory. It IS uncommon when the exercise physiologists ARE the world class athletes being tested!
Niels Secher was World Champion in 1970 and Roger Jackson Olympic Champion in 1972. Jackson went on to have a distinguished career at the University of Calgary while Professor Secher,
coauthor of over nearly 300 research studies remains very active at The Copenhagen Muscle Research Center.
This study provided on water oxygen consumption measurements collected at competition boat speeds.
One observation made by the authors was that although peak VO2 was the same on the water as during bicycle testing,
peak ventilation was lower during the rowing bouts.
Since 1970 a fair number of studies reporting the physical capacity of elite rowers have been reported. A number of these were performed by Dr. Fred Hagerman, now officially retired from Ohio University, who tested national team rowers for over 3 decades. Measurements before the late 1960s are very scarce. So, in the chart above, yellow points are measured results. The green dot is an attempt at correcting the underestimation of Henderson and Haggerd. And, red dots are educated guesses. What seems reasonable to conclude is that physical capacity of elite rowers has increased dramatically over 150 years due to both size increases AND major increase in training load, as we will soon see.
Today elite rowers are characterized by an absolute max between 6 and 7 liters per minute. And, yes there are a few reliable measurements of rowerrs exceeding 7 liters per minute, including a recent world and Olympic champion in the 1x.
Living in Scandinavia and being familiar with the testing results of a group of endurance athletes well known for their aerobic capacity, it is tempting to make some comparisons. If we scale up typical international class test results from XC skiers using the 0.73 power scaling factor quantified by Jensen and colleagues, we get an allometrically equivalent 95kg rower with a 7.5 liter VO2 max. While test results of 7 liters/min have been reported, a reputable value of 7.5 L/min has not been reported to my knowledge. Where are these athletes? Why are they so rare?
It is clear that we have witnessed a dramatic scale-up of physical dimensions and in turn physical capacity among the best rowers over time. However, how much has this increase in physical dimensions contributed to improved performance, independent of other factors, such as training? Comparing modern lightweight and heavy weight performers gives us a clue. Here I quantified the performance velocity difference for the top 3 finishers from 3 boat classes over 3 years from Lucerne, a venue with generally stable racing conditions. Athletes from these two groups differ in bodyweight and height by an amount quite similar to the difference between elite rowers before the turn of the century and today.
But, of course, not only have physical dimension changed, but both lightweight and HWt rowers train differently today then 150 years ago. This book by British coach Archibald McClaren from 1866 gives us some clues to what state of the art training looked like in the mid to late 19th century.
Here is a training description for US national team rowers preparing for the Olympics.
&lt;number&gt;
If we zoom in on training developments over the last few decades, Fiskerstrand and I recently published a retrospective analysis
of the training and physical characteristics of 28 international medal winning Norwegian rowers from the 70s, 80s, and 90s. Make note that the average VO2 max
of the athletes increased about half a liter/min form the 70s to the 80s. This was not attributable due to a size increase, as physical dimensions were unchanged.
It also does not seem to be well explained by the small increase in training volume.
&lt;number&gt;
There was a significant change in training philosophy from the 1970s that seems to correspond with a better understanding of the energetics of rowing.
Specifically, very high intensity training was decreased and more training at lower intensities was added. Notice that the change in training intensity distribution corresponds with the change in physical
capacity of the rowers.
Seen in the context of the training loads endured by modern elite rowers, it is difficult to imagine that the training and competition program described by Archibald McClaren In 1866 was once viewed as potentially hazardous to one’s health, but it was.
Questions about the athletes heart and a potential connection to cardiomyopathy and sudden cardiac death have continued to the present day.
In 1991, Pelicia publiched the results of cardiological screenings of almost 1000 elite Italian athletes. Among them only 16 were found to have
ventricular wall thicknesses exceeding clinical standards for hypertrophic cardiomyopathy. Interestingly, most of these were rowers, often highly successful ones.
Pelicia went on in subsequent studies to show that the myocardial remodeling induced by elite level training was
physiological and not pathological. Here we see a elite rowers heart in the 2 panels above and the heart of an untrained control below.
In this study, Pelicia showed that the extreme ventricular hypertrophy observed in some eltie endurance athletes was
reversed with long term detraining. More than any other research group, the Italian cardiologists lead by Pelicia have clarified the true nature of the “Athletes heart” first described almost 150 years ago.
Rowing is often viewed as a sport that bridges strength and endurance. Among endurance sports, rowing is probably the sport where the most attention has been given to the role of muscular strength as a limiting factor in performance.
Attempts at measuring forces at the pin were already made at the turn of the century. However, the first useful data was provided by Ishiko collected on Olympic medalists form the 64 Tokyo Olympics.
We will come back to another aspect of Ishiko’s force measurement work later
A few years after Ishiko’s work was published, Secher related the average force per stroke to the known
features of the force velocity relationship and assumed that the rowing stroke was performed at about 0.4 times peak
contractile velocity during a race. From this he estimated an isometric strength requirement of 1300N for “Rowing Strength”
Secher than measured 7 Olympic and world medalists on a series of strength tests, including the one pictured which he called a rowing strength test.
Lower level rowers and non-rowers were also measured.
The 2 interesting findings were:
1) The difference in rowing strength between the champion rowers and the club rowers and non rowers was not impressive
and 2) rowing strength was not correlated with strength measures for the different muscle groups involved when measured in isolation. This suggests that typical weight room exercises may transfer poorly to rowing.
Le us now look to the other side of the power balance equation
We begin with the issue of the drag forces acting on the boat
It has long been established that the resistance on a rowing shell moving through the water increases exponentially with velocity. Haggerd and Henderson showed this for rowing shells in their boat pulling studies in 1925.
While resistance increases with the square of velocity, power demands increase in proportion to the cube of the velocity change. If we express power demands in terms of oxygen demand the picture looks roughly like this.
What we can quickly concede is that any large increase in boat velocity from present levels, say 10%, would require what I would call a “genetically prohibitive” increase in physical capacity of the rowers, using today’s boats.
There is general agreement that skin drag, or the drag associated with water being dragged along by the surface of the boat as it passes through, represents the major source of drag on rowing shells. Normally wave drag is the largest source of resistance on water craft, but rowing shells have such a large length to beam ratio that wave drag only accounts for about 7% of total drag.
Air resistance can be meaningful, but normally only accounts for 10% of total drag. Plus there is just not much that can be won in terms of improving the aerodynamics of the rowing movement or the large rowers performing them.
Some have tried.
Here was the racing standard boat of the day in 1830, an inrigged boat with keel and a “rough” hull construction. The beam of the boat was about 1.1 meters
Over a 25 year period, rowing boats underwent a metamorphosis, immediately shedding half a meter of width thanks to the invention of the outrigger, lengthening to achieve the present extreme length to beam ratio, removing the keel, and covering an internal frame with a smooth wooden skin.
By 1856, the metamorphosis was essentially complete.
Small refinements have continued to the present day, but as this picture shows, the 4 man shell built by Matt Taylor in 1855 would be hard to distinguish from a wooden boat 100 years later.
From the 1850s there were probably no radical improvements in boat hull design until 1972, when the transition to epoxy and carbon fiber materials resulted in a dramatic reduction in boat weight. For example, the weight of an 8+ went down by 40kg.
This equation derived by Oxford physicist Alex Dudhia is one of several that deal with the impact of dead weight in boat velocity.
So, since the radical changes in boat characteristics already happened 150 years ago, and boat weight has been reduced to a standardized level, the only way to achieve a radical improvement in boat velocity might well be to lift it completely out of the water. Former international kayak paddler and hobby physicist Erling Rasmussen has achieved this with flatwater kayaks. Two hydrofoil wings allow a sufficiently high lift to drag ratio to lift the entire boat out of the water under human power. He calculates that a foil kayak 1x could beat a rowing 8+ over 2000m due to the dramtatic reduction in drag.
Now we turn our attention to the link between rower power and boat movement, the oar and its propulsive efficiency.
The distance over which the oar blade acts on the water is obviously a direct function of the distance the hands pull through. To achieve a long powerful stroke you have to be able compress and extend the entire body. A key development in rowing propulsion was therefore the development of the sliding seat. It has been suggested that the idea of the sliding seat happened during a rainy day race when some rowers realized that their reach was extended as they slid slightly on their fixed seat.
The first true sliding seat was developed by Babcock in 1857. It had a limited run of maybe 30 cm. The proper length of the slide in 1870 was described as 4 to 6 inches, or perhaps 15 cm. The evolution of the sliding seat towards the modern version with ~80 cm run took time to achieve technologically. But, as Babcock himself describes, it also complicated the technique of rowing.
Clearly the gain in power output overweighed the increased technical demands, and the sliding seat and the mastery of a highly compressed catch and powerful whole body drive became a fundamental characteristic of fast rowing.
So the sliding seat transformed rowing into a whole body endurance sport and lengthened the distance over which handle forces could be maintained. This also changed the behavour of the oar blade in the water.
We often describe the catch and drive in rowing in terms of “locking on” to the water at the catch. This implies a solidity in the oar- water interface that is not really there.
The oar blade moves through the water WITH the boat movement direction, which has lead to suggestions that hydrodynamic lift plays an important role in boat propulsion. AND, the oar slips backwards through the water. In other words energy is lost to moving water.
The hydrodynamic efficiency can be measured in terms of power applied at the oar handle relative to power loss moving water
Much of the evolution of oar shape has been in an effort to reduce the slip of the oar through the water and improve hydrodynamic efficiency. Many of you in the audience are familiar with the transition from Macon blades to the current big blade or cleaver design that took the rowing world by storm in 1991.
The idea of the big blade was already patented in the 1870s.
Subsequent studies quantified what rowers quickly recognized to be a meaningful increase in hydrodynamic efficiency and faster boat speed. It seems reasonable to conclude that oar efficiency has improved incrementally over the last 150 years as technology has permitted changes in blade surface area and shape.
Oar developments continue today. The present focus seems to be centered around taking advantage of lift forces at the start and finish of the drive. Volker Nolte seems to have been the first to describe a role for lift in boat propulsion. However, it is oar manufactorers, particularly the Dreissigacker brothers from the US, who have applied an experimental approach to making better oars that continues today. I like these guys. Though not sport scientists, they have certainly applied science and an experimental mindset to the sport of rowing with great success.
Based on current measurements of oar efficiency, we might se a further gain in boat speed of 2-3% if current power losses to the water were cut by 30-50% with better oar design.
This brings us to the final big variable, rowing technique!
Good rowing technique can be boiled down to 1) minimizing velocity fluctuations, 2) minimizing boat rotations, and 3) optimizing and/or synchronizing force curves.
A rowing shell surges through the water. This is due to both the pulsatile nature of the force application, and the reactions of the boat to rowers’ body mass being accelerated in the boat.
Larger fluctuations in boat speed require greater propulsive power for the same average velocity. We don’t want to reduce the peak velocity of the boat, but we try to minimize the rapid velocity reduction occurring during the recovery and early catch.
We cant eliminate the power surges in the stroke, but we do try to reduce the negative impact on boat speed of the body sliding into the catch.
What if we could essentially eliminate the problem of body movement altogether?
Bringing the sliding rigger back would undoubtedly increase boat speed, perhaps as much as 2% if one includes the impact of decreasing the energy cost of rowing, and perhaps an improvement in boat stability
As Babcock noted already in 1870, moving 90kg body rapidly in very light, very narrow boats can make for a technical challenge. Setting up or balancing the boat plays a fundamental role in optimizing performance. So, the question is how much can this aspect of rowing be improved?
Elite level rowers allow a boat roll of 0.3 to 2 degrees during rowing.
Finally, we come to the rowing stroke itself and its optimization. The work of Ishiko published in 1971 really laid the foundation for a debate which continues today. Ishiko showed that no two rowers have the same exact force profile, even when they came from an experienced crew. He wrote:
German investigators followed up in 1978 by comparing pairs of 2 rowers rowing together. They pointed out for example the similarity in force curves of the “good pair” on top. However, notice the pair on the bottom. They had been rowing together for a year, and yet their force curves were still fundamentally different. Are great crews “born” in the sense that we find rowers who fit together, or can they be made by reshaping individual force curves?
Wing and Woodburn examine the force curves of the bow 4 of an 8 and showed that
the force curves were stable with fatigue and
switching out a rower had no impact on the force curves of the other rowers in the short term. Other studies have showed some adaptability of the rowing force curve to other rowers, so this issue is debated.
A current focus in rowing science is the optimization of the force curves of a crew. IS there an optimal force curve in rowing?
In conclusion, here is a best estimate of the relative contribution of different variables to the dramatic improvements in boat velocity we have seen over the first 150 years of modern rowing history.
The question is, how much faster can they go?