Which statement about EPOC is true?

Which statement about EPOC is true?

• A. It represents the oxygen cost after exercise in terms of extra oxygen consumed
• B. It occurs only during exercise
• C. It has nothing to do with oxygen
• D. It reduces metabolic rate after exercise

Answer: (A)

Excess post-exercise oxygen consumption (EPOC) is the extra oxygen the body must take in after activity to return to its resting state. After exercise, the body works to restore energy stores (like ATP and phosphocreatine), clear metabolic byproducts (such as lactate), re-saturate oxyhemoglobin and myoglobin, and re-balance body temperature and hormones. All of these processes require energy supplied by oxygen, so the rate of oxygen uptake stays above resting levels for a period after exercise. That elevated oxygen uptake is precisely what EPOC measures—the oxygen cost after exercise. The other statements don’t fit because EPOC occurs after exercise, not during; it is directly related to oxygen use, and it actually increases metabolic rate temporarily as the body works to return to homeostasis, rather than reducing it. The amount of EPOC depends on how intense and long the exercise was.

Excess post-exercise oxygen consumption (EPOC) is the extra oxygen the body must take in after activity to return to its resting state. After exercise, the body works to restore energy stores (like ATP and phosphocreatine), clear metabolic byproducts (such as lactate), re-saturate oxyhemoglobin and myoglobin, and re-balance body temperature and hormones. All of these processes require energy supplied by oxygen, so the rate of oxygen uptake stays above resting levels for a period after exercise. That elevated oxygen uptake is precisely what EPOC measures—the oxygen cost after exercise.

The other statements don’t fit because EPOC occurs after exercise, not during; it is directly related to oxygen use, and it actually increases metabolic rate temporarily as the body works to return to homeostasis, rather than reducing it. The amount of EPOC depends on how intense and long the exercise was.