Individual Differences in Oxygen Debt Curves Related to Mechanical Efficiency and Sex

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Abstract
A closed circuit method was used to obtain 62 intake measurements during rest, exercise, and recovery periods on 22 men and 21 women (college students) who performed a submaximal exercise on an electric bicycle ergometer (680 kg. m./min. for 6 min. at 62 pedal r.p.m.). Analysis of the exponential 2-component O2 recovery curves showed that men have a faster alactic velocity constant than women but do not differ in other factors. Less efficient men and less efficient women have larger lactate debt components, larger proportions of lactate debt in the total debt, higher zero-time intercepts for the lactate components, and slower lactate velocity constants than more efficient men and women. The differences were statistically significant.

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