The increase in VO₂ max following training is caused by an increase in A) maximal stroke volume only. B) maximal a-vO₂ difference only. C) both maximal stroke volume and maximal a-vO₂ difference. D) maximal heart rate only.

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The increase in VO₂ max following training is caused by both maximal stroke volume and maximal a-vO₂ difference. This is because training can lead to an increase in the volume of blood pumped with each beat (stroke volume) as well as an increase in the amount of oxygen extracted from the blood by the working muscles (a-vO₂ difference). Maximal heart rate may also increase with training, but it is not the sole contributor to the increase in VO₂ max.

The Increase in VO2 Max Following Training Is Caused by an Increase

The Increase in VO₂ Max Following Training Is Caused by an Increase