Abstract

The single-stage treadmill walking test of Ebbeling et al. is commonly used to predict maximal oxygen consumption (V O2max) from a submaximal effort between 50% and 70% of the participant’s age-predicted maximum heart rate. The purpose of this study was to determine if this submaximal test correctly predicts V O2max at the low (50% of maximum heart rate) and high (70% of maximum heart rate) ends of the specified heart rate range for males and females aged 18 – 55 years. Each of the 34 participants completed one low-intensity and one high-intensity trial. The two trials resulted in significantly different estimates of V O2max (low-intensity trial: mean 40.5 ml * kg-1 * min-1, s = 9.3; high-intensity trial: 47.5 ml * kg-1 * min-1, s = 8.8; P<0.01). A subset of 22 participants concluded their second trial with a V O2max test (mean 47.9 ml * kg-1 * min-1, s = 8.9). The low-intensity trial underestimated (mean difference = 73.5 ml * kg-1 * min-1; 95% CI = 76.4 to 70.6 ml * kg-1 * min-1; P = 0.02) and the high-intensity trial overestimated (mean difference = 3.5 ml * kg-1 * min-1; 95% CI = 1.1 to 6.0 ml * kg-1 * min-1; P = 0.01) the measured V O2max. The predictive validity of Ebbeling and colleagues’ single-stage submaximal treadmill walking test is diminished when performed at the extremes of the specified heart rate range. Verf.-Referat