Physical Education - Lactic acid accumulation
Other causes of fatigue
- if intensity of work is maximal, PC stores (which are stored in the
muscle) are depleted in approximately 10 seconds.
- is stored in the liver and muscles. Once depleted, performance
deteriorates as the body switches to fats. As a result, performance is
Fats release less ATP per molecule/gram than glycogen. Rate and amount of
depletion is dependent on exercise intensity, diet and initial levels of
Dehydration is largely a result of increased body temperature. The body's
most effective method of cooling is through evaporation of water. The
increase in body temperature can be dangerous (40 degrees can lead to
unconsciousness). Losses of water greater than 2% result in a significant
decrease in performance.
Dehydration is detrimental to performance as it restricts blood flow,
which is responsible for carrying oxygen and removing waste from muscles.
The result is slower restoration of PC stores and more rapid accumulation
of lactic acid, both leading to fatigue.
Fast twitch fibres are suited to anaerobic activities. Explosive efforts
of short duration only.
Slow twitch fibres are suited to aerobic conditions. Slower contractions,
slower to fatigue.
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