Table 1.
Physiological responses from the graded exercise test using two “collateral” systems (1 and 2: mean ± SD), and p value from paired t tests, absolute percentage error (APE), coefficient of variation (CV), and effect size
| Variable | System 1 | System 2 | Paired t p value | APE mean (range) | CV mean (range) | Effect size |
|---|---|---|---|---|---|---|
| V E (L min−1) | ||||||
| Rest | 11.91 ± 6.29 | 11.84 ± 6.14 | 0.850 | 12.4 (2.0–39.7) | 8.4 (1.4–23.4) | 0.01 |
| 30 W | 19.57 ± 4.29 | 20.01 ± 4.47 | 0.110 | 4.3 (0.5–12.9) | 2.9 (0.4–8.6) | 0.11 |
| 60 W | 26.83 ± 3.40 | 27.41 ± 3.50 | 0.280 | 6.7 (0.0–18.1) | 4.6 (0.0–11.7) | 0.17 |
| 90 W | 37.37 ± 4.49 | 37.94 ± 3.43 | 0.160 | 3.1 (0.1–11.7) | 2.2 (0.1–7.8) | 0.15 |
| 120 W | 49.33 ± 7.49 | 50.71 ± 5.64 | 0.170 | 6.2 (0.4–17.3) | 4.2 (0.3–11.2) | 0.21 |
| VO2 (L min−1) | ||||||
| Rest | 0.30 ± 0.06 | 0.31 ± 0.06 | 0.780 | 11.6 (1.1–26.2) | 8.1 (0.8–20.2) | 0.05 |
| 30 W | 0.73 ± 0.08 | 0.74 ± 0.08 | 0.200 | 4.7 (0.0–16.5) | 3.2 (0.0–10.8) | 0.18 |
| 60 W | 1.06 ± 0.08 | 1.07 ± 0.08 | 0.380 | 4.2 (0.7–9.4) | 2.9 (0.5–7.0) | 0.17 |
| 90 W | 1.44 ± 0.09 | 1.46 ± 0.07 | 0.340 | 3.1 (0.1–10.5) | 2.2 (0.1–7.1) | 0.20 |
| 120 W | 1.83 ± 0.14 | 1.85 ± 0.10 | 0.320 | 3.7 (0.2–8.5) | 2.6 (0.1–5.7) | 0.18 |
| VCO2 (L min−1) | ||||||
| Rest | 0.28 ± 0.09 | 0.28 ± 0.10 | 0.720 | 12.6 (1.0–37.4) | 8.6 (0.7–22.3) | 0.04 |
| 30 W | 0.63 ± 0.08 | 0.64 ± 0.09 | 0.160 | 4.5 (0.5–14.9) | 3.1 (0.4–9.8) | 0.17 |
| 60 W | 0.95 ± 0.08 | 0.97 ± 0.08 | 0.120 | 5.2 (0.1–13.5) | 3.5 (0.1–9.0) | 0.32 |
| 90 W | 1.36 ± 0.11 | 1.39 ± 0.09 | 0.090 | 3.3 (0.2–14.0) | 2.2 (0.2–9.2) | 0.27 |
| 120 W | 1.77 ± 0.19 | 1.82 ± 0.17 | 0.070 | 3.9 (0.1–13.4) | 2.7 (0.1–8.9) | 0.26 |
| F EO2 (%) | ||||||
| Rest | 17.58 ± 0.60 | 17.57 ± 0.55 | 0.890 | 1.1 (0.2–2.9) | 0.8 (0.1–2.0) | 0.02 |
| 30 W | 16.42 ± 0.54 | 16.43 ± 0.58 | 0.810 | 0.6 (0.1–1.9) | 0.4 (0.1–1.3) | 0.02 |
| 60 W | 16.14 ± 0.45 | 16.18 ± 0.43 | 0.500 | 0.9 (0.0–2.8) | 0.6 (0.0–2.0) | 0.08 |
| 90 W | 16.21 ± 0.37 | 16.24 ± 0.31 | 0.600 | 0.8 (0.0–2.5) | 0.6 (0.0–1.7) | 0.08 |
| 120 W | 16.37 ± 0.37 | 16.44 ± 0.36 | 0.170 | 1.1 (0.2–2.1) | 0.8 (0.1–1.5) | 0.20 |
| F ECO2 (%) | ||||||
| Rest | 3.06 ± 0.40 | 3.06 ± 0.37 | 0.840 | 3.7 (0.1–12.6) | 2.6 (0.0–8.4) | 0.02 |
| 30 W | 4.03 ± 0.46 | 4.02 ± 0.47 | 0.860 | 2.2 (0.4–7.6) | 1.6 (0.3–5.6) | 0.01 |
| 60 W | 4.41 ± 0.42 | 4.42 ± 0.43 | 0.560 | 2.1 (0.1–5.4) | 1.5 (0.1–3.7) | 0.05 |
| 90 W | 4.55 ± 0.38 | 4.55 ± 0.33 | 0.890 | 2.6 (0.6–7.9) | 1.8 (0.4–5.4) | 0.01 |
| 120 W | 4.48 ± 0.32 | 4.46 ± 0.34 | 0.610 | 3.1 (0.4–6.6) | 2.2 (0.3–4.5) | 0.07 |
| RER | ||||||
| Rest | 0.90 ± 0.13 | 0.90 ± 0.15 | 0.930 | 4.1 (0.0–14.3) | 2.9 (0.0–10.9) | 0.01 |
| 30 W | 0.86 ± 0.04 | 0.86 ± 0.06 | 0.770 | 2.6 (0.1–7.5) | 1.8 (0.0–5.1) | 0.05 |
| 60 W | 0.89 ± 0.04 | 0.90 ± 0.04 | 0.090 | 2.5 (0.2–7.6) | 1.7 (0.1–5.2) | 0.29 |
| 90 W | 0.95 ± 0.03 | 0.95 ± 0.05 | 0.210 | 2.0 (0.0–7.3) | 1.4 (0.0–5.0) | 0.22 |
| 120 W | 0.97 ± 0.04 | 0.98 ± 0.05 | 0.070 | 2.6 (0.3–4.9) | 1.8 (0.2–3.4) | 0.30 |
* Significantly different means by paired t test with Holm’s sequential Bonferroni adjustment