A height-adjusted step test for predicting maximal oxygen consumption in males.

A suitable testing device that is generally favored for estimating maximal oxygen consumption (VO2max) under field conditions or in environments where testing equipment is limited is the step test. Recently a mathematical model was reported to standardize the height of stepping for individuals of various heights. The purpose of this study was to validate this model in males. Thirty-three men aged 18 to 47 (x = 28) performed each of three rate-specific step tests and a Bruce treadmill test. Direct measurements of VO2max obtained from the treadmill test were correlated with a 15 second recovery heart rates after three different step tests were performed at stepping frequencies of 22, 26 and 30 ascents/minute. The correlation coefficients for prediction of VO2max from the recovery heart rate and directly measured oxygen consumption were 0.77 at 22 and 0.81 at 26 and 30 ascents/minute. Each relationship was statistically significant at the p < 0.01 level. It can be concluded that the single-stage height adjusted step test provides an effective predictor of VO2max in males and can be used when more complex methods of clinical testing are unavailable or not feasible.