Exercise physiology · Physiology

The term 'oxygen deficit' during exercise refers to:

  1. The amount of oxygen lacking in circulating arterial blood
  2. Gap between oxygen need and uptake at exercise onset
  3. Reduced oxygen saturation during recovery
  4. Excess oxygen consumed after exercise
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Correct answer: Gap between oxygen need and uptake at exercise onset

Oxygen deficit is the gap between the oxygen required for a given workload and the oxygen actually consumed at the start of exercise. It occurs because aerobic metabolism takes time to reach steady state.

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