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App Phys week 6

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bethdrysdale94's version from 2017-01-27 18:06

Section 1

Question Answer
Muscle temperature on forcenegative curve
Muscle temperature on mechanical powerincrease then decrease curve
Muscle temperature on energy utilisationexponential increase followed by plateau
Muscle temperature on efficiencyexponential increase followed by less rapid decrease
Muscle temperature on %force and angular velocityspeed of contraction increases at higher temperatures. force doesnt change but speed of contraction does (force = number of cross bridges, fixed value)
in 1945 what was said about increased body temp and exercise?quicker sprint, higher jump etc
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Section 2

Question Answer
What was the wingate sprint study in 1987 about force generating capability?water bath temperature effects on power generating capability - warmer bath, higher power generation however the end force/minimum power at the end is the same - higher temperatures cause quicker fatigue. limitations: water bath temperature instead of muscle temperature
velocity dependence in wingate sprint studytemperature had marginal effects at lower speeds (which are more dependent on number of cross bridges). at higher velocity, theres a higher contractile speed and temperature had far greater effect >>> warmer temp increased peak power and ability to pedal at higher rates
What happens to PCr ATP turnover and glycolytic ATP turnover at different temperatures?higher temp = increased ATP turnover (which is an enzymatic process). resulted in a greater depletion of PCr and glycolysis so fatigue time decreased. PCr and glycolysis depletion rate increased in both muscle fibre types at higher temperatures
What increase in power can you expect with a 1degree increase in temp?4-10% (however many factors to consider)
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Section 3

Question Answer
How much does muscle temperature reduce in 30 mins?1 degree which is around 10% decrease in power potential
What can be done to reduce loss in muscle temp during the "call room" period?heated trousers in cycling - allows for prevention of 141W decrease which is about 10%
What temperature are velodromes typically maintained at?28 degrees to reduce air density and drag allowing for better velocity
What happens at rest and after exercise to muscle temperature in a cool environment? (less than 15degrees)at rest, temp gradient across muscle increases with depth. with 15 mins of exercise, temp at 3cm increase, temp at 2cm increases, but temp at 1cm depth remains the same. 15 more minutes of exercise, temp at 3&2cm only slightly increases but 1 cm hardly changes.
Are athletic warm ups effective at increasing muscle temp?No, no heated clothing allowed in athletics. after warm up including stretches, striding, and 18-20 mins of drills (total 30 mins), temperature only increased by less than 0.5degree after call room period in comparison to pre warm up
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Section 4

Question Answer
What are the advantages of summation whilst warming up?avoids muscle fatigue, optimises warm up procedure through this as fatigued muscle is less powerful.
explain "less is more"standard directed warm up caused fatigue and less cycling power, no warm up wouldve meant more cycling power.
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