A maximal multistage 20-m shuttle run test to predict \(\dot V\) O2 max

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Summary

In order to validate a maximal multistage 20-m shuttle run test for the prediction of \(\dot V\) O2 max, 91 adults (32 females and 59 males, aged 27.3±9.2 and 24.8±5.5 year respectively and with mean \(\dot V\) O2 max (± SD) of 39.3±8.3 and 51.6±7.8 ml·kg−1·min−1 respectively) performed the test and had \(\dot V\) O2 max estimated by the retroextrapolation method (extrapolation to time zero of recovery of the exponential least squares regression of the first four 20-s recovery \(\dot V\) O2 values). Starting at 8 km·h−1 and increasing by 0.5 km·h−1 every 2 min, the 20-m shuttle run test enabled prediction of the \(\dot V\) O2 max (y, ml·kg−1·min−1) from the maximal speed (x, km·h−1) by means of the following regression equation: y=5.857x — 19.458; r=0.84 and SEE=5.4. Later, the multistage protocol was slightly modified to its final version, in which the test started at stage 7 Met and continued with a 1 Met (3.5 ml O2·kg−1·min−1) increment every 2 min. Twenty-five of the 91 subjects performed the 20-m shuttle test twice, once on a hard, low-friction surface (vinyl-asbestos tiles) and another time on a rubber floor, as well as a walking maximal multistage test on an inclined treadmill. There was no difference between the means of these tests or between the slopes of the \(\dot V\) O2max — maximal speed regressions for the two types of surfaces. The 20-m shuttle run test and another maximal multistage field test involving continuous track running gave comparable results (r=0.92, SEE=2.6 ml O2·kg−1·min−1, n=70). Finally, test and retest of the 20-m shuttle run test also yielded comparable results (r=0.975, SEE=2.0 ml O2·kg−1·min−1, n=50). It is concluded that the 20-m shuttle run test is a valid and reliable test for the prediction of the \(\dot V\) O2 max of male and female adults, individually or in groups, on most gymnasium surfaces.

Supported by the Ministère du Loisir, de la Chasse et de la PÊche du Québec (H.C.S.R. 7919)