Table 3.
Comparison of HR, SpO2 and symptoms during the 6MWT and CPET.
| Variable (N = 20) | CPET (mean ± SD) | 6MWT (mean ± SD) |
|---|---|---|
| Resting HR (beats minute−1) | 85 ± 13 | 83 ± 10 |
| Peak HR (beats minute−1) | 128 ± 18 | 119 ± 15b |
| Peak HR (%pred HRmax)a | 84 ± 11 | 79 ± 10b |
| ΔHR (beats minute−1) | 44 ± 16 | 37 ± 14 |
| Resting SpO2 (%) | 97 ± 2 | 97 ± 1 |
| Nadir SpO2 (%) | 95 ± 3 | 93 ± 2b |
| ΔSpO2 (%) | −1 ± 3 | −4 ± 2b |
| End-test BORGd | 6.9 ± 2.6 | 3.1 ± 1.6c |
| End-test BORGf | 6.8 ± 2.4 | 2.0 ± 1.9c |
6MWT: six-minute walk test; CPET: cardiopulmonary exercise test; BORGd: dyspnoea; BORGf: leg fatigue; HR: heart rate; SpO2: peripheral capillary oxygen saturation measured via pulse oximetry; ΔSpO2: nadir SpO2 − initial SpO2); HRmax: maximum heart rate.
aHRmax was calculated from the equation HRmax = 220 − age.
b p < 0.05: Statistically significant differences between tests.
c p < 0.01: Statistically significant differences between tests.