Table 2 Test–re-test reliability and measurement error rate estimates at baseline and 6 weeks
Workload | Parameter | Baseline mean (SD) | 6-week mean (SD) | Mean difference (95% CI) | Tau-correlation (absolute difference v mean) | ICC(2,1) (95% CI) | SEM (95% CI) | SEM % | MDC90 (%) |
|---|---|---|---|---|---|---|---|---|---|
Original measurements | |||||||||
1.0 W kg/FFM | |||||||||
(n = 41) | \(\dot{V}{\text{O}}_{2}\) (ml/kg/min) | 12.68 (3.14) | 12.47 (3.61) | 0.21 (− 0.92, 1.34) | < 0.01 | 0.44 (0.16, 0.66) | 2.54 (2.08, 3.94) | 20.2 | 5.93 (47.1) |
(n = 41) | \(\dot{V}{\text{O}}_{2}\) (L/min) | 0.87 (0.29) | 0.84 (0.29) | 0.03 (− 0.04, 0.10) | 0.12 | 0.67 (0.45, 0.81) | 0.17 (0.14, 0.21) | 19.8 | 0.40 (46.1) |
(n = 38)* | Heart rate (bpm) | 89.11 (12.43) | 86.97 (13.74) | 2.13 (− 0.95, 5.21) | − 0.11 | 0.74 (0.56, 0.86) | 6.67 (5.50, 8.62) | 7.6 | 15.6 (17.7) |
(n = 41) | RER | 0.92 (0.08) | 0.92 (0.08) | 0.01 (− 0.02, 0.03) | 0.13 | 0.57 (0.32, 0.75) | 0.05 (0.04, 0.07) | 5.4 | 0.12 (12.7) |
1.5 W kg/FFM | |||||||||
(n = 34) | \(\dot{V}{\text{O}}_{2}\) (ml/kg/min) | 16.06 (3.86) | 16.28 (3.92) | − 0.21 (− 1.54, 1.11) | < 0.01 | 0.53 (0.23, 0.73) | 2.69 (2.17, 3.54) | 16.1 | 6.28 (37.6) |
(n = 34) | \(\dot{V}{\text{O}}_{2}\) (L/min) | 1.11 (0.36) | 1.12 (0.36) | − 0.01 (− 0.14, 0.12) | 0.23 | 0.69 (0.46, 0.83) | 0.20 (0.17, 0.27) | 17.7 | 0.47 (41.3) |
(n = 33)* | Heart rate (bpm) | 98.45 (10.78) | 97.91 (13.18) | 0.54 (− 2.20, 3.29) | 0.13 | 0.80 (0.63, 0.89) | 5.48 (4.41, 7.25) | 5.6 | 12.8 (13.0) |
(n = 32)** | RER | 0.95 (0.06) | 0.95 (0.06) | − 0.00 (− 0.02, 0.02) | − 0.12 | 0.63 (0.37, 0.80) | 0.03 (0.02, 0.05) | 3.2 | 0.07 (7.4) |
2.0 W kg/FFM | |||||||||
(n = 25) | \(\dot{V}{\text{O}}_{2}\) (ml/kg/min) | 20.87 (4.84) | 20.29 (5.04) | 0.58 (− 1.16, 2.33) | 0.15 | 0.64 (0.33, 0.82) | 2.99 (2.34, 4.16) | 14.5 | 6.98 (33.9) |
(n = 25) | \(\dot{V}{\text{O}}_{2}\) (L/min) | 1.49 (0.51) | 1.43 (0.48) | 0.06 (− 0.09, 0.21) | 0.23 | 0.74 (0.49, 0.87) | 0.25 (0.20, 0.35) | 17.1 | 0.58 (40.0) |
(n = 25) | Heart rate (bpm) | 109.88 (15.63) | 109.88 (15.65) | 0.00 (− 6.63, 6.63) | 0.28 | – | – | – | – |
(n = 25) | RER | 0.98 (0.07) | 0.98 (0.07) | − 0.00 (− 0.03, 0.02) | 0.08 | 0.57 (0.22, 0.78) | 0.04 (0.03, 0.06) | 4.1 | 0.09 (9.5) |
2.5 W kg/FFM | |||||||||
(n = 17) | \(\dot{V}{\text{O}}_{2}\) (ml/kg/min) | 24.63 (4.86) | 24.75 (6.15) | − 0.11 (− 2.46, 2.22) | − 0.01 | 0.67 (0.29, 0.87) | 3.22 (2.40, 4.91) | 13.0 | 7.51 (30.4) |
(n = 17) | \(\dot{V}{\text{O}}_{2}\) (L/min) | 1.74 (0.76) | 1.75 (0.59) | − 0.01 (− 0.18, 0.16) | 0.21 | 0.84 (0.60, 0.94) | 0.24 (0.18, 0.36) | 13.8 | 0.56 (32.2) |
(n = 16)* | Heart rate (bpm) | 119.31 (9.28) | 120 (12.48) | − 0.69 (− 4.05, 2.67) | 0.13 | 0.54 (0.11, 0.81) | 9.80 (7.30, 14.92) | 8.1 | 22.9 (18.9) |
(n = 17) | RER | 0.98 (0.06) | 0.98 (0.06) | − 0.00 (− 0.03, 0.02) | − 0.01 | 0.57 (0.13, 0.82) | 0.04 (0.03, 0.07) | 4.1 | 0.09 (9.5) |
RER = 1.00 | |||||||||
(n = 40) | \(\dot{V}{\text{O}}_{2}\) (ml/kg/min) | 19.88 (8.39) | 19.83 (8.18) | 0.05 (− 1.37, 1.46) | − 0.01 | 0.86 (0.75, 0.92) | 3.56 (2.92, 4.55) | 17.6 | 8.31 (41.1) |
(n = 40) | \(\dot{V}{\text{O}}_{2}\) (L/min) | 1.45 (0.61) | 1.52 (0.65) | − 0.06 (− 0.23, 0.10) | 0.08 | 0.65 (0.43, 0.80) | 0.40 (0.33, 0.51) | 26.9 | 0.93 (62.9) |
Log-transformed measurements | |||||||||
2.0 W kg/FFM | Heart rate (bpm) | 2.03 (0.01) | 2.03 (0.01) | 0.01 (− 0.01, 0.02) | 0.24 | – | – | – | – |