Journal of Applied Physiology
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J Appl Physiol 17: 47-50, 1962;
8750-7587/62 $5.00
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Use of respiratory quotients in assessment of aerobic work capacity

B. Issekutz JR. 1, N. C. Birkhead 1, and K. Rodahl 1

1 Division of Research, Lankenau Hospital, Philadelphia, Pennsylvania

Oxygen uptake and carbon dioxide output were measured in 32 untrained subjects during exercise on the bicycle ergometer. It was shown that the work respiratory quotient (RQ) under standardized conditions can be used as a measure of physical fitness. DeltaRQ (work RQ minus 0.75) increases logarithmically with the work load and maximal O2 uptake is reached at a DeltaRQ value of 0.40. This observation offered the possibility of predicting the maximal O2 uptake of a person, based on the measurement of RQ during a single bicycle ergometer test at a submaximal load. For each work RQ between 0.95 and 1.15 a factor was presented, together with the aid of a simple equation, which gave a good approximation (generally better than ±10%) of the maximal O2 uptake.

Submitted on April 20, 1961




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