PHYSIOLOGY
MUSCLE ENERGETICS ATP AND CP
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The “burning” sensation during exercise and eventual muscular fatigue may be explained by:
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Lactate accumulation in the muscles
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Increase in acidity due to hydrogen ion (H+) accumulation from ATP breakdown within the muscles
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Injection of citric acid into the muscles
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None of the above
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Explanation:
Detailed explanation-1: -Lactic acid is formed and accumulated in the muscle under conditions of high energy demand, rapid fluctuations of the energy requirement and insufficient supply of O2. During intense exercise sustained to fatigue muscle pH decreases to about 6.4-6.6.
Detailed explanation-2: -The present data suggest that elevated muscle acidity does not reduce muscle glycogenolysis/glycolysis and is not the only cause of fatigue during intense exercise in man. Instead, accumulation of potassium in muscle interstitium may be an important factor in the development of fatigue.
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