Table 2.
Cardiopulmonary Exercise Test Variables
| Variables | Entire Cohort | O2 Pulse < 85% | O2 Pulse ≥85% | P-Value |
|---|---|---|---|---|
| Peak VO2, mL·min− 1 | 1376 [1057–1552] | 1166 [805–1330] | 1575 [1439–1946] | < 0.001 |
| Percent-predicted peak VO2, % | 62 [52–89] | 53 [46–61] | 91 [69–96] | < 0.001 |
| Peak VO2, mL·kg− 1·min− 1 | 16.9 [14.4–20.8] | 16.1 [12.4–18.2] | 19.7 [16.5–22.8] | 0.012 |
| Peak O2 Pulse, mL·beat− 1 | 9.2 [7.5–10.7] | 7.9 [6.9–9.3] | 10.4 [9.3–12.5] | 0.001 |
| %O2Pulse | 82 [66–96] | 68 [55–76] | 98 [93–112] | < 0.001 |
| Peak RER | 1.02 [0.95–1.09] | 0.97 [0.92–1.09] | 1.05 [1.00–1.11] | 0.045 |
| Resting Heart Rate, bpm | 73 [68–86] | 77 [67–86] | 73 [66–76] | 0.449 |
| Exercise Heart Rate, bpm | 150 [122–164] | 136 [115–157] | 151 [141–170] | 0.101 |
| Rest Systolic BP, mmHg | 124 [111–143] | 130 [113–144] | 123 [103–140] | 0.531 |
| Rest Diastolic BP, mmHg | 70 [63–81] | 70 [67–82] | 68 [57–79] | 0.374 |
| Exercise Systolic BP, mmHg | 174 [155–190] | 175 [150–182] | 170 [158–201] | 0.475 |
| Exercise Diastolic BP, mmHg | 70 [70–80] | 72 [70–80] | 70 [63–81] | 0.329 |
| Breathing Reserve, % | 33 [22–46] | 24 [16–44] | 37 [26–49] | 0.156 |
| Peak SpO2, % | 97 [95–99] | 98 [94–100] | 97 [96–99] | 0.682 |
Data are listed as median and (interquartile range). P-values are differences between groups (< 85% and ≥ 85% predicted peak exercise O2 Pulse)
Abbreviations: VO2 oxygen consumption, O2 oxygen, %O2Pulse percent-predicted peak exercise oxygen pulse, RER respiratory exchange ratio, BP blood pressure, SpO2 peripheral oxygen saturation