A COMPARISON OF SOME RESPIRATORY AND CIRCULATORY REACTIONS OF ATHLETES AND NON-ATHLETES

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Abstract
When the minute-vol. of breathing is stated in terms of square meters of skin surface or in terms of the ventilation equivalent the economy of the breathing of the athlete is emphasized. The athlete and non-athlete, during rest and moderate exertion, consume approximately equal amts. of O2 per square m. of body surface. They also withdraw equal amts. of O2 from a liter of blood. The circulatory gains that result from a period of physical training are a reduction in the frequency of heart beat and an increase in the output of the heart per beat. The min.-vol. of circulation, when stated in terms of skin surface, seems to be approximately the same for athletes and non-athletes. The O2 pulse, when stated in terms of skin surface, gives a good index of differences in heart stroke as found for the athlete and non-athlete.

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