Explain the differences between oxygen deficit and excess postexercise oxygen consumption (EPOC)
At the onset of exercise, the increase in O2 delivery and the VO2 lags behind the demand for the energy released from the ATP until a steady state in VO2 is achieved. During this period of rapid disruption to homeostasis of the body, the energy demand of the exercise is partially met by anaerobic processes and is defined as an oxygen deficit.
After exercise the VO2 does not return to resting values immediately, as excess O2 consumption occurs when the efficiency between mitochondrial oxidation and phosphoryltion of substrates is unequal. This excess O2 consumption can be attributed to the body's gradual cooling, and to the return of cellular membrane sodium-potassium pump function and metabolism to resting, or homeostatic operation that was disrupted at the onset of exercise.
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