Table 2.
Effects of shortened exercise duration on measurements of cardiopulmonary exercise testing
| Exercise duration | 100% | 90% | 75% | p value |
| V̇O2 (ml/ min) | 1695 ± 491 | 1508 ± 446 | 1337 ± 385 | <0.0001 |
| V̇O2 (ml/kg/min) | 27.4 ± 8.0 | 24.4 ± 7.2 | 21.6 ± 6.2 | <0.0001 |
| Heart rate (beats/min) | 159 ± 19 | 140 ± 15 | 124 ± 26 | <0.0001 |
| RER | 1.15 ± 0.11 | 1.07 ± 0.09 | 1.01 ± 0.08 | <0.0001 |
| V̇E/V̇CO2 slope | 31.2 ± 4.3 | 29.8 ± 4.1 | 28.8 ± 4.1 | 0.01 |
| OUES | 2147 ± 499 | 2158 ± 508 | 2162 ± 491 | 0.98 |
| OUES/kg | 34.8 ± 7.2 | 35.0 ± 7.2 | 35.1 ± 7.1 | 0.98 |
Data are expressed as mean ± SD. Abbreviations: V̇O2 = oxygen uptake; RER = respiratory exchange ratio; V̇E/V̇CO2 slope = regression slope between minute ventilation and carbon dioxide production; OUES = oxygen uptake efficiency slope