alveolar-arterial oxygen partial pressure difference

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The difference between the partial pressure of oxygen in the alveolus and the mean arterial pressure of oxygen, measured in mmHg or kPa. It indicates the efficiency of gaseous exchange in the lungs. During heavy exercise, the alveolar–arterial oxygen partial pressure difference increases 2.0–2.5 times the resting levels.

Subjects: Sports and Exercise Medicine.

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