A comparison of maximal oxygen uptake by treadmill and step-test procedures.

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Abstract
Estimations of maximal O2 uptake by a treadmill and step-test procedure were obtained on 12 subjects within a 7-day period. Expressed in ml/min. per kilogram STPD [standard temperature and pressure dry], treadmill values ranged from 40.2 to 54.1, with a mean of 48.3 and a standard deviation of 4. 5. The step-test values ranged from 37.2 to 56.0, with a mean of 48.0 and a standard deviation of 5.1 ml/min. per kg STPD. The coefficient of correlation between treadmill and step-test scores was + . 95. From this and a negligible difference of means of 0. 24 ml/min. per kg the results of the 2 procedures were practically indentical. Test-retest by 5 subjects using the step-test procedure showed a mean difference favoring the 2 test of 1. 5, with a greatest difference of 1. 6 ml/min. per kg. Because of its apparent reliability, economy, safety, and versatility in accommodating a wide age range of normal and impaired subjects, the step-test procedure is preferred.

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