TABLE 1.
Reproducibility and Minimal Detectable Change for Oxygen Consumption (VO2) at Submaximal Walking Speeds
| Rest | 40% Below Nominal Speed 0.71 (0.02) m/s | 20% Below Nominal Speed 0.94 (0.03) m/s | Nominal Speed 1.18 (0.04) m/s | 20% More Than Nominal Speed 1.41 (0.05) m/s | 40% More Than Nominal Speed 1.65 (0.06) m/s | Self-Selected Walking Speed 1.28 (0.14) m/s | |
|---|---|---|---|---|---|---|---|
| Gross VO2 (ml/kg/min) | |||||||
| Test 1 (SD) | 3.46 (0.41) | 9.22 (1.05) | 10.51 (1.04) | 12.24 (1.06) | 14.98 (1.42) | 18.56 (1.64) | 13.45 (1.95) |
| Test 2 (SD) | 3.49 (0.44) | 9.19 (0.86) | 10.47 (0.84) | 12.23 (0.98) | 14.95 (1.15) | 18.47 (1.43) | 13.46 (1.70) |
| ICC [CI] | .43 [−.41, .77] | .92 [.81, .97] | .85 [.63, .94] | .89 [.74, .96] | .89 [.73, .95] | .91 [.78, .96] | .96 [.89, .98] |
| CV% | 7.3 | 2.6 | 2.6 | 2.0 | 2.3 | 2.0 | 2.5 |
| SEM | 0.32 | 0.27 | 0.36 | 0.34 | 0.43 | 0.46 | 0.37 |
| MDC (%M) | 0.88 (25.5) | 0.75 (8.1) | 1.01 (9.6) | .94 (7.6) | 1.18 (7.9) | 1.27 (6.9) | 1.01 (7.5) |
| Net VO2 (ml/kg/min) | |||||||
| Test 1 (SD) | 5.92 (1.02) | 7.22 (1.08) | 8.96 (1.11) | 11.68 (1.43) | 15.26 (1.73) | 10.19 (1.79) | |
| Test 2 (SD) | 5.70 (0.68) | 6.98 (0.69) | 8.74 (0.84) | 11.46 (1.00) | 14.97 (1.37) | 9.96 (1.55) | |
| ICC [CI] | .74 [.40, .89] | .66 [.21, .86] | .83 [.59, .93] | .83 [.60, .93] | .88 [.71, .95] | .93 [.84, .97] | |
| CV% | 7.3 | 6.4 | 4.1 | 3.7 | 3.0 | 4.0 | |
| SEM | 0.43 | 0.52 | 0.40 | 0.50 | 0.54 | 0.44 | |
| MDC (%M) | 1.20 (20.3) | 1.43 (19.8) | 1.11 (12.4) | 1.39 (11.9) | 1.49 (9.8) | 1.23 (12.0) | |
Note. SD = standard deviation; ICC = intraclass correlation coefficient; CI = 95% confidence interval; CV = coefficient of variation; SEM = standard error of measurement; MDC = minimum detectable change; %M = MDC expressed as a percent of measurement mean.