Trained individuals have a lower oxygen deficit; this may be due to A) having a lower VO₂ max. B) having a greater reliance on anaerobic pathways. C) the involvement of the ATP-CP energy system. D) having a better developed aerobic bioenergetic capacity.

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Trained individuals have a better developed aerobic bioenergetic capacity, which enables them to efficiently use oxygen to produce energy. This results in a lower oxygen deficit during exercise. A lower VO₂ max would actually result in a higher oxygen deficit, while a greater reliance on anaerobic pathways and the ATP-CP energy system would not necessarily result in a lower oxygen deficit.

Trained Individuals Have a Lower Oxygen Deficit; This May Be