Lecture6-2009W

Lecture6-2009W - (2) lactic acid type of fatigue Light...

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Interplay of aerobic and anaerobic catabolism during exercise h Sustained activity: steady-state aerobic catabolism h Sudden, intense exertion: aerobic cat. is not enough Metabolic transitions during exercise (1) at the start: oxygen deficit - unbalance between O 2 need/supply (2) the pay-as-you-go - steady-state aerobic cat. (3) at the end: EPOC [excess postexercise O 2 consumption] - metabolize lactic acid - oxygen debt , but EPOC preferred Supramaximal exercise (1) not enough ATP supply by pay-as-you-go
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Unformatted text preview: (2) lactic acid type of fatigue Light submaximal exercise ATP source varies with exercise or activity duration (1) Sprinter (100-m dash) - anaerobic (a) + phosphogens (b) + O2 stores (c)- total ATP demand, very low b/c short duration (2) A mile race- ATP demand > a+b+c = 25~50% total ATP demand- aerobic metabolism (slow) b slower speed (3) Marathon- ATP demand very high (a+b+c = 2-3% total demand)- aerobic dependency, very high...
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