Identification of the main targets when quantifying exercise intensities during training in PwMS.
Content:
1.Definitions
2.Introduction
3.Endurance Training
3.1 Maximum Oxygen Consumption(VO2max)
3.2 Maximum Heart rate (HRmax)
3.3 Rating of percieved exertion
3.4 Recommendations
4.
Resistance Training
4.1 Normatives
4.2 Quantification of the training intensity
4.3 Conclusions
5.
Discussion
Presentation of Dr. Dean Hess at 10th Pulmonary Medicine Update Course, Cairo, Egypt. Pulmonary Medicine Update Course is organized by Scribe : www.scribeofegypt.com
Identification of the main targets when quantifying exercise intensities during training in PwMS.
Content:
1.Definitions
2.Introduction
3.Endurance Training
3.1 Maximum Oxygen Consumption(VO2max)
3.2 Maximum Heart rate (HRmax)
3.3 Rating of percieved exertion
3.4 Recommendations
4.
Resistance Training
4.1 Normatives
4.2 Quantification of the training intensity
4.3 Conclusions
5.
Discussion
Presentation of Dr. Dean Hess at 10th Pulmonary Medicine Update Course, Cairo, Egypt. Pulmonary Medicine Update Course is organized by Scribe : www.scribeofegypt.com
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When exercising for a very long period of time, sweating will occur and other physiological responses such as dehydration, decrease blood glucose, increase in heart rate, loss of electrolytes, fatigue etc which will lead to a decrease in exercise performance. Hence, there is an important function of rehydrating the body with fluids (sport drinks) containing electrolytes and carbohydrates to improve exercise endurance and performance. In this study examined the effects of effect of home made fruit drink (coconut and pineapple) on exercise endurance time of young adult females, (age: 17-26 years) of their height ranges (1.53-1.74 meters), weight ranges (42-98kg) and their BMI ranges (16.41-35.25 kg/m2) jogged at designated points for 45 minutes. After the 45 minutes exercise, they rested for 10 minutes and were administered the different drinks (control 1(water), control 2 (lucozade sport drink) and test sample (home-made coconut-pineapple fruit drink)). After administering the drinks, their heart rates and blood pressures were taken and measured then they rested for 5 minutes. After a period of rest for 15 minutes in total, they continued the exercise till they were exhausted. The result indicated that the home made coconut-pineapple fruit drink observed to have an effect on the endurance time as well as the lucozade sport isotonic drink, while water was observed not to improve the endurance time. Okonkwo, C. O. J | Oguaka V.N. | Mbachu, P"The Effect of Homemade Drink on Exercise Endrance Time in Young Adult Females" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd10757.pdf http://www.ijtsrd.com/medicine/physiology/10757/the-effect-of-homemade-drink-on-exercise-endrance-time-in-young-adult-females/okonkwo-c-o-j
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4. Role of dehydration in heat stress-induced
variations in mental performance
A battery of tests was performed to assess the effect of
various degrees of dehydration on mental performance,
n=11 soldiers of India
After 1, 2, 3, 4% dehydration induced by exercise in heat:
Short-term memory impaired at 2% or more
dehydration
Visual-motor tracking impaired at 2% or more
Attention impaired at 2% or more dehydration
Arithmetic ability impaired at 2% or more
Gopinathan PM. Arch Environ Health 43:15–17, 1988
5. Role of hydration on cognitive function
Cognitive test battery was administered prior and
30 min post- intervention (exercise or heat –
induced dehydration)
2.8% dehydration by exercise or climatic heat:
Increased perception of fatigue
increased tracking errors,
increasedreaction time to making a decision,
decreased short-term memory impaired
Long-term memory : Impaired recall, especially
following exercise
Cian C, J Psychophysiology 14:29–36, 2000
6. Dehydration
Performance in physical and cognitive tasks is
impaired.
Fluid ingestion during exercise can decrease the
sensation of fatigue when exercise > 40 minutes
A high core temperature, especially a high brain
temperature, seems to be associated with the
onset of fatigue in endurance exercise in warm
environments
Changes in brain neurotransmiters, (dopamine)
and alterations of cerebral blood flow appear to
be responsible for fatigue when exercising in the
7. Significant dose-related effects of dehydration
Symbol substitution test effects
were observed at the 3% level
of dehydration (p < .05),
Eye-hand coordination effects
were observed at all three
levels of dehydration
Sharma VM, Sridharan K, Pichan G,
Panwar MR: Influence of heat-stress
induced dehydration on mental
functions.Ergonomics29 :791,1986
8. “How sore does your head feel now?”
“How well can you concentrate just
now?”
Changes in body mass over time for fluid
restriction and euhydration conditions
Subjects reported feelings of headache during the trial and
their ability to concentrate and their alertness were reduced.
9. Decrements in psychomotor, and
cognitive performance can occur when>
2% of body weight is lost due to water
restriction, heat, and/or physical
exertion
A major limitation of most studies
conducted to date is the inability to
determine the effects of dehydration
independent of the effects of thermal
stress, physical stress, and/or fatigue.
10. Mild dehydration impairs cognitive
performance and mood
Randomised, single-blind, trial (N= 26)
exercise-induced dehydration plus a diuretic
exercise-induced dehydration plus placebo
exercise while maintaining euhydration , plus placebo
A cognitive test battery, mood states and symptom
questionnaire (headache, concentration and task difficulty) was
administered
Dehydration degraded aspects of cognitive performance:
errors increased on visual vigilance
visual working memory response latency slowed
Fatigue and tension/anxiety increased
Plasma osmolality increased but resting temperature was not altered
Even mild dehydration without hyperthermia
induced adverse changes in vigilance and working
memory, and increased tension/anxiety and fatigue.
Ganio, MS. Br J Nutr. 2011;106(10):1535-43
12. Exercise-associated hyponatraemia
The first reports of hyponatraemic
encephalopathy in athletes, army
personnel, and hikers appeared
shortly after the new dictum: “drink
the maximal amount that can be
tolerated”.
To date at least seven fatalities and
more than 250 cases have been
described in the medical literature.
Presumably reported cases represent
only a small proportion of all such
cases.
13. Hyponatraemic encephalopathy is a potentially life threatening
condition, with cerebral oedema causing vomiting, headache,
confusion, coma, seizures and pulmonary oedema
14. hyponatremia (Na<135 mmol/l) in 13% participants
0.6% critical hypona (<120 mmol/l).
Predictors:
• weight gain while
running
• Long racing time,
• BMI extreme
16. Exercise-associated hyponatraemia
Thought to be due to overconsumption of
hypotonic fluid
inability to suppress antidiuretic hormone during
exercise or to mobilise adequate sodium from
osmotically inactive internal stores.
Non-specific symptoms- difficult to diagnose on
site without the assistance of Na measurement,
Any delay in treatment of patients with
encephalopathy can prove fatal.
Mainstays of treatment include fluid restriction,
hypertonic saline, loop diuretics and mannitol.
Editorial. Overconsumption of fluids by athletes BMJ 2003;327:113-114
17. Risk factors of EAH
military personnel,
female
marathon runner,
gains weight during exercise because
she drinks excessively
To prevent it, the advice is “ drinking
according to the personal dictates of
thirst”(fluid intake 400- 800 ml/hour)
Wijdicks EFM. Noncardiogenic pulmonary Edema in Marathon
Runners. Ann Intern Med, 2000; 133(12): 1010 - 1011.
SiegelAJ. Noncardiogenic Pulmonary Edema in Marathon
Runners. Ann Intern Med, 2000; 133(12): 1010
18. 44 years old patient admitted with serum Na 121 mmol/L &
oxigen saturation 66%
Ayus, J. C. et. al. Ann Intern Med 2000;132:711-714
19. Plasma AVP
concentrations were
markedly elevated after a
marathon despite
unchanged plasma (Na).
Pathogenesis of EAH
1. voluntary fluid intake exceeds urinary and sweat water
losses.
2. inability to maximally suppress (AVP)P during exercise
as a result of nonosmotic stimulation of AVP secretion
20.
21. Chronic hyponatremia:
potomany associated with
eating disorders
Overzealous correction of chronic
hyponatremia can lead to central pontine
myelinolysis, with permanent neurologic
deficits
The initial rate of sodium correction with
hypertonic saline should not exceed 1 to 2
mmol per L per hour
Correction of chronic hyponatremia should
be kept at a rate less than 10 mmol/L in
any 24-hour period
23. Healthy elderly subjects, 3 groups:
1. caloric restriction (30% reduction)
2. increased intake of UFAs (20%, unchanged total
fat),
3. control
Before and after 3 months of intervention, memory
was assessed under standardized conditions.
Witte A V et al. PNAS 2009;106:1255-1260
24. Percentage changes in weight, BMI , and unsaturated-to-saturated
fatty acids ratio after caloric restriction (group 1),
UFA enhancement (group 2), and control condition.
Witte A V et al. PNAS 2009;106:1255-1260
25. Significant increase in verbal memory scores after caloric
restriction (mean 20%), which was correlated with
decreases in plasma levels of insulin and CRP
Mechanisms: higher synaptic plasticity and stimulation of
neurofacilitatory pathways in the brain because of improved
insulin sensitivity and reduced inflammation
26. Beneficial effect of CR or
RSV supplementation on
specific cognitive functions
in a primate.
RSV could be a good
candidate to mimic long-
term CR effects
29. Evidence has accumulated suggesting that the
beneficial effect of fish is due to its content in omega-
3 polyunsaturated fatty acids (n-3 PUFAs)
2 kinds of omega-3 fatty acids:
plant-derived (α-linolenic acid) and
marine-derived (eicosapentaenoic acid [EPA] and
docosahexaenoic acid [DHA])
30. N-3 polyunsaturated fatty acids (PUFA)
1. α-linolenic acid: long-chain, 18-carbon atom with 3
double bonds
2. Eicosapentaenoic acid (EPA): 20 carbon atoms and
5 double bonds
3. Docosahexaenoic acid (DHA): 22 carbon atoms
and 6 double bonds
n-3 PUFA are "essential“: we cannot make them in our
bodies and they are needed for normal growth,
development, and optimal function of brain, heart, and
other systems
31. N3-PUFA
Important during early brain development, with low intake
resulting in poor neurological development and low IQ
(Innis SM. Dietary omega 3 fatty acids and the developing brain. Brain
Res. 2008;1237:35–43)
Such associations may extend through adolescence
(Aberg MA. Fish intake of Swedish male adolescents is a predictor of
cognitive performance. Acta Paediatr. 2009;98:555–60).
In late life, low fish intake predicts greater age-related
cognitive dysfunction and elevated risk for Alzheimer's
dementia
(Morris MC. Fish consumption and cognitive decline with age in a large
community study. Arch Neurol. 2005;62:1849–53)
32. 280 volunteers, 35 - 54 y.o.
Distributed by quintiles of DHA
intake
Higher DHA (mol %) was
related to better performance
on tests of nonverbal
reasoning and mental
flexibility, working memory,
and vocabulary (P ≤ 0.05).
Muldoon MF. Serum phospholipid docosahexaenonic acid is associated with
cognitive functioning during middle adulthood. J Nutr. 2010;140(4):848-53.
33. Chicago Health and Aging Project
Annual rate of change in cognitive score
(standardized units per year [SU/y])
by number of fish meals per week 3718 persons , > 65 years:
•cognitive testing were
conducted (basal & 3 years)
• self-administered food frequency
questionnaire (FFQ)
were conducted (basal & 3 years)
Fish consumption may
be associated with
slower cognitive decline
with age
Morris, M. C. et al. Arch Neurol 2005;62:1849-1853.
34. DHA May Prevent Age-Related Dementia
DHA acts at multiple steps to
reduce the production of the β-
amyloid
1. moderates some of the
kinases that
hyperphosphorylate the τ-
protein, a component of the
neurofibrillary tangle.
2. help suppress
neuroinflammation, and
oxidative damage that
contribute to synaptic loss and
neuronal dysfunction
3. increases brain levels of
neuroprotective brain-derived
neurotrophic factor
AD pathways targeted by DHA.
Cole G M , Frautschy S A J. Nutr. 2010;140:869
36. Hyperhomocystenemia
and B12 deficiency
Evidence is convincing that hyperhomocysteinemia
is a risk factor for dementia (leukoaraiosis )
B12 deficiency manifestations include abnormal
psychiatric, neurological, gastrointestinal, and
hematological findings (pernicious anemia)
Subclinical deficiencies exit (metformin¡¡)
Assessing serum B12 : <200 pg/ml
Patients with B12 deficiency and mild cognitive
impairment or dementia, might show cognitive
improvement with supplemental B12 treatment.
37. SAM
Aceptor ATP
Receptor Metionina
Ser
SAHomocis
THF
Aden Gly
Homocys metilen THF
B12
B6
Ser metil THF
Cistationina
B6
K-butirato Cys
38. Folic Acid
Low levels of folate are associated with
high blood levels of homocysteine which
has been linked with the risk of arterial
disease, dementia and Alzheimer's disease
long-term folic acid supplements appear to
improve cognitive function of healthy older
people with high homocysteine levels
There is a risk that folate supplementation
can delay the diagnosis of B12 deficiency,
which can cause irreversible neurological
damage. So, folic acid supplementation
must associate vitamin B12
40. A case-control study
Cases were 54 patients with probable AD
Controls ,54 persons, cognitively normal, matched
Patients with AD had an average daily caffeine
intake of 73 mg during the 20 years that preceded
diagnosis of AD, whereas the controls had an
average daily caffeine intake of 198.7 +/- 135.7 mg
Caffeine intake was associated with a
significantly lower risk for AD, independently
of other possible confounding variables
Maia & de Mendonça. Eur J Neurol 2002 9:377
41. Cardiovascular Risk, Aging and Dementia
(CAIDE Study)
After an average follow-up of 21 years, 1409 individuals
(71%) aged 65 to 79 completed the re-examination in 1998.
A total of 61 cases were identified as demented
Coffee drinkers at midlife had lower risk of dementia and AD
later in life adjusted for demographic, lifestyle and vascular
factors, apolipoprotein E epsilon4 allele and depression
The lowest risk (65% decreased) was found in people who
drank 3-5 cups per day.
Coffee drinking at midlife is associated with a decreased risk of
dementia/AD later in life. This finding might open possibilities
for prevention of dementia/AD
Eskelinen, M et al. Midlife Coffee and Tea Drinking and the Risk of
Late-Life Dementia: A Population-Based CAIDE Study . J Alzheimer Dis 16 (2009) 85-91
42. Caffeine
Epidemiological studies have found an association between
coffee consumption and improved cognitive function in AD
patients and in the elderly.
Long-term administration of caffeine (non-selective adenosine
antagonist) in animals showed a reduced amyloid burden in
brain with better cognitive performance.
Adenosine receptors play important roles in the modulation of
cognitive function. Antagonists of adenosine A2A receptors
mimic the beneficial effects of caffeine on cognitive function.
The adenosinergic system constitutes a new therapeutic target
for AD, and caffeine and A2A receptor antagonists may have
promise to manage cognitive dysfunction in AD
44. Mean Differences in Change in Cognitive
Function Scores by Quintile of Physical Activity*.
higher levels of physical activity, including
walking, are associated with better cognitive
function and less cognitive decline
Weuve, J. et al. JAMA 2004;292:1454-1461
45. Clear and strong associations between greater physical activity
and reduced cognitive decline in women with vascular disease
Adjusted global cognition composite score during the cognitive follow-up period (1998-2005) by
quintile of total physical activity at baseline (n = 2809)
Vercambre, M.-N. et al. Arch Intern Med 2011;171:1244-1250.
46. AEE as 90% of total energy Cognitive function was assessed at
expenditure (assessed using doubly baseline and 2 or 5 years later
labeled water) minus resting metabolic using the Modified Mini-Mental
rate (measured using calorimetry) State Examination
In this study, older adults with higher objectively
measured total daily activity had a lower incidence
of cognitive impairment
47. PRCT, randomized to a high-intensity aerobic exercise (45 to 60 min/d, 4 d/wk for 6
months) vs control. Results Six months of high-intensity aerobic exercise had effects on
cognition
Mean values representing the change from baseline for cognitive measures
Baker, L. D. et al. Arch Neurol 2010;67:71-79.
48. These studies showed that systematized
physical activity contributed to at least
improve temporarily some cognitive
functions of patients with Alzheimer's
disease, particularly, attention, executive
functions and language
Coelho et al. Rev Bras Psiquiatr.2009 ;31(2):163-70.