Prediction of maximal oxygen uptake from a 20-m shuttle run as measured directly in runners and squash players

The aim of this study was to assess the validity of the multistage shuttle run test in predicting maximal oxygen uptake (<(V)over dot>O-2 max) in athletes trained in sports with different physical demands. Over a 14-day period, 10 male long-distance runners (continuous high-intensity exercise) sind 10 male squash players (intermittent high-intensity exercise) performed, in random order, the multistage shuttle run test and a maximal treadmill protocol of increasing elevation which elicited <(V)over dot>O-2 max. Compared with direct measurement of <(V)over dot>O-2 max, the shuttle run test significantly underpredicted the <(V)over dot>O-2 max of the group of runners (n = 10; P < 0.01) and of the athletes as a whole (n = 20; P < 0.01). The correlation (r) between <(V)over dot>O-2 max determined by the shuttle run test and by the treadmill protocol was 0.61 (P < 0.05) for the squash players, 0.71 (P < 0.05) for the runners and 0.67 (P < 0.01) for the athletes as a whole. As the subjects represented athletes trained specifically in sports with different physical demands, this may explain why the correlations between the shuttle run test and direct measurement of <(V)over dot>O-2 max are less robust than those reported in previous studies. Furthermore, our results indicate that there are sport-specific differences when predicting <(V)over dot>O-2 max from the multistage shuttle run test.