Table 2.
Test-retest reliability of the cardiopulmonary performance parameters
| TB1 (mean ± SD) | TB2 (mean ± SD) | p-value | MD | 95%CI | SDD | 95 % LoA | CoV (%) | ICC (95 % CI) | |
|---|---|---|---|---|---|---|---|---|---|
| Absolute V'O2peak (mL/min) | 1130.5 ± 349.4 | 1156.4 ± 376.6 | 0.60 | 25.8 | −77.4, 129.1 | 200.8 | −0.26x̄, 0.26x̄ | 11.6 | 0.85 (0.64, 0.94) |
| Relative V'O2peak (mL/kg/min) | 15.7 ± 4.7 | 16.0 ± 4.9 | 0.65 | 0.3 | −1.1, 1.7 | 2.8 | −0.26x̄, 0.26x̄ | 11.6 | 0.84 (0.61, 0.94) |
| HRpeak (beats/min) | 120.9 ± 26.3 | 124.2 ± 25.2 | 0.26 | 3.2 | −2.6, 9.0 | 11.3 | −18.9, 25.3 | 6.9 | 0.90 (0.76, 0.96) |
| HRpeak% of APMHR | 78.0 ± 15.0 | 80.1 ± 13.6 | 0.26 | 2.04 | −1.6, 5.7 | 7.2 | −12.1, 16.2 | 6.9 | 0.87 (0.69, 0.95) |
| RERpeak | 1.06 ± 0.09 | 1.08 ± 0.08 | 0.10 | 0.02 | −0.01, 0.52 | 0.06 | −0.1, 0.1 | 4.1 | 0.78 (0.49, 0.91) |
| WRpeak (W) | 28.0 ± 12.4 | 29.0 ± 13.3 | 0.36 | 1.07 | 1.4, 3.5 | 4.6 | −7.9, 10.1 | 13.4 | 0.94 (0.83, 0.98) |
| Absolute V'O2VAT (mL/min) (n = 16) | 575.4 ± 105.9 | 635.5 ± 177.3 | 0.045 | 60.1 | −1.4, 118.9 | 110.2 | −0.34x̄, 0.34x̄ | 14.5 | 0.67 (0.27, 0.87) |
| Relative V'O2VAT (mL/kg/min) | 8.0 ± 1.6 | 8.8 ± 2.4 | 0.050 | 0.8 | 0.0, 1.6 | 1.5 | −0.34x̄, 0.34x̄ | 14.5 | 0.68 (0.29, 0.88) |
| V'O2VAT% of V'O2peak (%) | 50.3 ± 9.4 | 53.1 ± 9.1 | 0.27 | 2.8 | −2.4, 8.2 | 10 | −16.8, 22.4 | 15.4 | 0.41 (−0.07, 0.74) |
| HRVAT (beats/min) (n = 15) | 89.5 ± 9.3 | 91.9 ± 9.7 | 0.17 | 2.4 | −1.1, 6.0 | 6.5 | −10.3, 15.1 | 5.5 | 0.76 (0.44, 0.91) |
| HRVAT % of HR reserve | 32.6 ± 9.2 | 35.1 ± 11.5 | 0.33 | 2.5 | −2.8, 7.8 | 9.5 | −16.1, 21.1 | 19.5 | 0.58 (0.13, 0.84) |
| HRVAT % of APMHR | 57.3 ± 5.4 | 58.8 ± 5.2 | 0.20 | 1.5 | −0.9, 3.8 | 4.3 | −0.62x̄, 0.62x̄ | 5.5 | 0.67 (0.28, 0.87) |
| Absolute V'O2RCP (mL/min) (n = 12) | 956.5 ± 197.9 | 1002.9 ± 179.4 | 0.33 | 46.3 | −54.1, 146.6 | 157.9 | −263.2, 355.8 | 11.6 | 0.65 (0.17, 0.88) |
| Relative V'O2RCP (mL/kg/min) | 13.4 ± 2.5 | 14.1 ± 2.5 | 0.28 | 0.7 | −0.7, 2.1 | 2.1 | −3.4, 4.8 | 11.6 | 0.77 (0.24, 0.87) |
| V'O2RCP% of V'O2peak (%) | 77.2 ± 8.8 | 82.1 ± 6.8 | 0.035 | 4.9 | 0.4, 9.5 | 7.1 | −9.0, 18.8 | 8.3 | 0.50 (−0.02, 0.82) |
| HRRCP (beats/min) (n = 11) | 112.5 ± 18.2 | 113.6 ± 17.7 | 0.42 | 1.1 | −5.3, 7.4 | 9.4 | −17.3, 19.5 | 5.8 | 0.87 (0.59, 0.96) |
| HRRCP % of HR reserve | 70.2 ± 16.2 | 73.6 ± 10.8 | 0.48 | 3.5 | −7.0, 14.0 | 15.6 | −27.1, 34.1 | 18.4 | 0.37 (−0.28, 0.78) |
| HRRCP % of APMHR | 71.3 ± 12.1 | 71.9 ± 11.7 | 0.72 | 0.7 | −3.2, 4.6 | 5.8 | −10.7, 12.1 | 5.8 | 0.89 (0.64, 0.97) |
| RPE dyspnea | 5.1 ± 2.0 | 5.2 ± 2.7 | 0.93 | 0.1 | −0.8, 0.9 | 1.7 | −3.2, 3.4 | 28.4 | 0.76 (0.44, 0.91) |
| RPE leg effort | 6.8 ± 2.1 | 7.5 ± 1.6 | 0.23 | 0.8 | −0.3, 1.8 | 2 | −3.1, 4.7 | 29.5 | 0.41 (−0.04, 0.73) |
| V'E/V'O2 at VAT | 31.8 ± 4.8 | 32.8 ± 5.0 | 0.28 | 0.9 | −0.8, 2.7 | 3.3 | −5.6, 7.4 | 7.3 | 0.77 (0.48, 0.91) |
| V'E/V'CO2 at RCP | 33.8 ± 3.7 | 33.8 ± 3.7 | 0.91 | 0.1 | −1.2, 1.3 | 2.0 | −3.9, 4.0 | 4.5 | 0.87 (0.60, 0.96) |
| V'E-vs-V'CO2 slope to RCP | 32.2 ± 4.8 | 33.0 ± 5.5 | 0.36 | 0.8 | −1.0, 2.6 | 2.8 | −4.7, 6.3 | 6.1 | 0.85 (0.58,0.96) |
| 6 MWD (n = 12) | 502.5 ± 113.4 | 528.3 ± 113.1 | 0.010 | 25.8 | 7.5, 44.1 | 28.7 | −30.5, 82.1 | 5.6 | 0.95 (0.65, 0.99) |
n = 17, unless otherwise indicated
TB1 baseline test 1, TB2 baseline test 2, APMHR age-predicted maximal heart rate, VAT ventilatory anaerobic threshold, RCP respiratory compensation point, 6 MWD 6 min-walk distance, MD mean difference, SDD standard deviation of difference, LoA limits of agreement, CoV coefficient of variation, ICC intraclass correlation coefficient, CI confidence interval, x̄ individual average