Run, change direction, acceleration and deceleration are basic movement in many sports, which forces are involved? How we can improve our athletes safety?

1. Captiks
Run, Change of Direction, Acceleration and Deceleration studied with
Inertial Sensors

2. HUMAN MOTION ANALYSIS
«One of the society's mission is to promote the study and clinical applications of the MOTION ANALYSIS methods
in order to improve the assessment of motor disorders, to increase the effectiveness of treatments through
quantitative data analysis and a more focused treatment planning, and also to quantify the results of current
therapies.» http://www.siamoc.it/it-it/home.aspx
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3. HUMAN MOTION ANALYSIS
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Clinical Area:
• Analysis of the balance;
• Analysis of efficacy deriving from pharmacological, surgical and
rehabilitative treatments;
• Analysis on the physiopathology of the skeletal and locomotor system;
Bioengineering Area:
• Fitting of prostheses/orthoses and evaluating their effectiveness (pre-
and post-operative comparisons);
Sport Area:
• Identify harmful movements during training in order to prevent
injuries;
• Improve the performance of athletes through the quantitative analysis
of their gestures.

4. MOTION ANALYSIS LAB
The central element of a motion analysis lab can be well represented by the acquisition systems present within it:
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OPTOELECTRONIC SYSTEM
ELECTROMYGRAPHIC SYSTEM
FORCE PLATE
BAROPODOMETRIC PLATFORM
INERTIAL SENSOR

5. MOTION ANALYSIS LAB
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Other Measures:
• Foot pressure
• Balance
• Body Asimmetry
Electromyographic
Analysis:
• Muscle Activations
Dynamic Analysis:
• Forces
• Moments
• Powers
Kinematics Analysis:
• Joint Angles
• Spatio-Temporal
parameter

6. MOTION ANALYSIS LAB
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Other Measures:
• Foot pressure
• Balance
• Body Asimmetry
Electromyographic
Analysis:
• Muscle Activationes
Dynamic Analysis:
• Forces
• Moments
• Powers
Kinematics Analysis:
• Joint Angles
• Spatio-Temporal
parameter

7. KINEMATIC AND DYNAMIC ANALYSIS
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INERTIAL SYSTEMGOLD STANDARD

8. INERTIAL SYSTEM
System based on:
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9. INERTIAL SYSTEM
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System based on:

10. APPLICATION AREAS
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INDUSTRY
• New products and applications development
• Pilot projects
SIMULATION
• Advanced Simulations
• Motion Capture
• Interaction / Gaming
SPORT
• Performance
• Training
• Injury’s Prevention
MEDICAL
• Rehabilitation
• Range of motion
• Motion Analysis
RESEARCH
• Robotics
• Analysis
• Remote Control

11. Captiks

12. Sistema INERZIALE
MOTION CAPTURE
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13. INERTIAL SYSTEM PROS and CONS
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ADVANTAGES
• Easy Sensors Positioning
• Small Sensor Size
• Reduced calibration time
• Possibility of carrying out analyzes in any environmental
condition
• Possibility of carrying out tests in natural conditions
• Possibility to carry out kinematics and dynamics measurements
with a single instrument
• Low costs
Technological Limits
• Duration of calibration
• Gyroscope drift
• Disorders related to the magnetometer
• Identification of linear and gravitational
acceleration components

14. INERTIAL SENSORS : SPORT
BEHIND THE PERFORMANCE
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PERFORMANCE
PARAMETERS
PREVENTION
PARAMETERS

15. PREVENTION PARAMETERS
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GRF
BMC
SPECTRAL
COMPONENT
Ground Reaction Force
Body Motion Control
Resonance and Vibration

16. PREVENTION PARAMETERS
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GRF
BMC
SPECTRAL
COMPONENT
It represents the average of the module vector obtained
from the accelerations along the three directions.

17. Captiks
GRF
BMC
SPECTRAL
COMPONENT
* Daniel W.T. Wundersitza, Kevin J. Nettoab , Brad Aisbetta & Paul B. Gastina. «Validity
of an upper-body-mounted accelerometer to measure peak vertical and resultant force
during running and change-of-direction tasks.» Sports Biomechanics (2014).
It represents the force exerted by the ground on the whole
body with which it is in contact. It is expressed in Newton or
in Body Weight.
PREVENTION PARAMETERS

18. Captiks
GRF
BMC
SPECTRAL
COMPONENT
* Winslow, Martyn R. Shorten and Darcy S. «Spectral Analysis of impact Shock During
Running.» (1992).
PREVENTION PARAMETERS
It represents the harmonic content of the accelerometric
signal. It allows analyzing data according to the distribution
of energy at different frequencies. Signals that show greater
spectral content at high frequencies are those that most
weigh on the athlete from the point of view of the vibrations
arising from the impact.

19. SHUTTLE TEST
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20 m
Shuttle Test: 20m front and back sprint with 180 ° change of direction performed at top speed
with deceleration in the last 5 meters before the change
*Test was conducted on natural pitch from 14 professional football players that have performed 2 repetitions of the
shuttle test (28 tests in total). Athletes were analysed with an inertial sensor Movit G1 placed in the middle of the pelvis
above the iliac crest.

20. SHUTTLE TEST
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21. SHUTTLE TEST
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22. SHUTTLE TEST
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Acceleration Phase

23. SHUTTLE TEST
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Deceleration Phase

24. SHUTTLE TEST
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Crossover – Cut Phase

25. SHUTTLE TEST
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Acceleration Post CD Phase

26. RESULTS
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The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)
Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]

27. RESULTS
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The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)
Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]
p_value= 0,6

28. RESULTS
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The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)
Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]
p_value << 0,05

29. RESULTS
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Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]
The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)

30. SPECTRAL COMPONENT SHUTTLE PHASES
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ACCELERATION PHASE
DECELERATION PHASE
AREA:
0,1(g2)
AREA:
0,5(g2)

31. SPECTRAL COMPONENT SHUTTLE PHASES
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ACCELERATION PHASE
DECELERATION PHASE
AREA:
0,1(g2)
AREA:
0,5(g2)

32. Captiks
Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]
The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)
RESULTS

33. GRF SHUTTLE PHASES
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75 kg
75 kg 75 kg75 kg75 kg
ACCELERATION PHASE
75 kg 75 kg75 kg75 kg
75 kg75 kg75 kg
DECELERATION PHASE
GRF:
3,9(BW)
2765(N)
GRF:
7,1(BW)
5145(N)

34. GRF SHUTTLE HIP-SHANK
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75 kg 75 kg75 kg75 kg
75 kg75 kg75 kg
DECELERATION PHASE HIP
75 kg 75 kg75 kg75 kg
75 kg75 kg75 kg
DECELERATION PHASE TIBIA
75 kg 75 kg75 kg75 kg
75 kg75 kg75 kg
75 kg 75 kg75 kg75 kg
75 kg75 kg75 kg
At the ankle level the shock
impact is amplified 3-4 times*
*Allison H. Gruber, Katherine A. Boyer, Timothy R.
Derrick, Joseph Hamill. «Impact shock frequency
components and attenuation in rearfoot and forefoot
running.» Journal of Sport and Health Science (2014).
*Carrie A. Laughton, Irene McClay Davis, Joseph Hmil.
«Effect of Strike Pattern and Orthotic Intervention on
Tibial Shock During Running.» JURNAL OF APPLIED
BIOMECHANICS (2003).
*Niell G. Elvin, Alex A. Elvin,and Steven P. Arnoczky.
«Correlation Between Ground Reaction Force and Tibial
Acceleration in Vertical Jumping.» (2007).
GRF:
7,1(BW)
2765(N)
GRF:
∼21(BW)
5145(N)

35. Captiks
Acceleration Phase Deceleration Phase Crossover-Cut Phase Acceleration post CD Phase
BMC 2,1 ± 0,3 [g] 3,0 ± 0,5 [g] 1,6 ± 0,2 [g] 2,2 ± 0,4 [g]
SPECTRAL COMPONENT 0,1 ± 0,08[g2] 0,5 ± 0,2 [g2] 0,07 ± 0,03 [g2] 0,1 ± 0,07 [g2]
GRF 3,9 ± 1,3 [BW]
2765 [N]
7,3 ± 1,9 [BW]
5145 [N]
2,8 ± 1,3 [BW]
1998 [N]
3,9 ± 1,2 [BW]
2739 [N]
The inertial sensor Movit G1 has been set with: Fs: 200Hz, Acc FSR: 16g, GyroFSR: 2000dps
*Test conducted by 14 professional football players on natural turf that have performed 2 repetitions of the shuttle test (28 tests in total)
RESULTS

36. Captiks
Change direction is one of the most unbalanced
situations in sports.
Not only the lower body, but the whole body is
involved in these type of movement.
The pelvis area must be considered as one of the most
important since its take many compensation derived
by technical movement.
CHANGE DIRECTIONS

37. Captiks
CHANGE DIRECTIONS
Change direction is one of the most unbalanced
situations in sports.
Not only the lower body, but the whole body is
involved in these type of movement.
The pelvis area must be considered as one of the most
important since its take many compensation derived
by technical movement.

38. Captiks
THE FOOT’S BIOMECHANIC IN CHANGE DIRECTION
Ankle and subtalar
joint are crucial in
many sport
movements
Running and
Crossover-cut
movements are
not excluded!

39. Captiks
THE FOOT’S BIOMECHANIC IN CHANGE DIRECTION
Correct ankle movements are strictly related to the integrity of the foot’s anatomy and to its function

40. Captiks
THE FOOT’S BIOMECHANIC IN CHANGE DIRECTION
Rock and Roll movements show the
importance of the ankle’ structures
in athletes foot to sustain any type
of technical movements

41. Captiks
THE FOOT’S BIOMECHANIC IN CHANGE DIRECTION
Injuries is a strongly related to misuse of the
part of body involved in movement.
Ankle block is one of the consequences of
many injuries in sport

42. Captiks
THE FOOT’S BIOMECHANIC IN CHANGE DIRECTION
We suggest some simple trick, like our
“Biocup” to training the foot structures
to the instability to increase their
mobility and function, keeping in mind
the sport specific movement

43. www.biomoove.com
www.captiks.com
info@captiks.com
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THANK YOU FOR
YOUR ATTENTION