Table 2.
CPET Responses between OSA and non-OSA Participants and Associations with OSA Severity.
| Correlations |
|||||
|---|---|---|---|---|---|
| CPET Variable | Non-OSA (n = 9) | OSA (n = 43) | AHI | SaO290 | ODI |
| HRrest, bpm | 69.8 (3.6) | 80.1 (1.6)* | .33† | .09 | .30† |
| HRpeak, bpm | 166.1 (6.1) | 163.9 (2.2) | −.25 | −.24 | −.27 |
| % Heart Rate Reserve | 95.0 (4.7) | 89.9 (2.0) | −.40† | −.30† | −.42† |
| HRR-1, bpm | 24.3 (2.5) | 17.9 (1.2)* | −.45† | −.25 | −.37† |
| HRR-3, bpm | 48.7 (3.1) | 38.8 (1.8)* | −.59† | −.29† | −.51† |
| HRR-5, bpm | 53.7 (1.5) | 43.3 (4.2)* | −.61† | −.32† | −.54† |
| SBPrest, mmHg | 125.1 (2.7) | 129.6 (1.7) | .06 | −.01 | .02 |
| SBPpeak, mmHg | 188.9 (7.4) | 186.7 (3.6) | −.18 | .01 | −.09 |
| Recovery SBP3, % peak | 89.3 (3.0) | 89.2 (1.0) | −.05 | −.13 | −.14 |
| DBPrest, mmHg | 78.9 (2.8) | 82.5 (1.4) | −.13 | −.28† | −.20 |
| DBPpeak, mmHg | 79.8 (2.3) | 85.7 (1.9) | −.14 | −.22 | −.15 |
| Recovery DBP3, % peak | 98.2 (1.2) | 99.5 (1.2) | .09 | −.09 | −.02 |
| Peak RER | 1.16 (0.07) | 1.19 (0.02) | .17 | .14 | .11 |
| VO2peak, mL/kg/min | 22.1 (2.3) | 21.6 (0.8) | −.19 | −.05 | −.13 |
| VE/VCO2 slope | 27.8 (1.1) | 27.2 (0.7) | −.07 | −.10 | −.11 |
Left: data are presented as mean (standard error); right: data are presented as Pearson product-moment correlations. AHI: apnea-hypopnea index; CPET: cardiopulmonary exercise test; DBP: diastolic blood pressure; DBP3: DBP at 3-min active recovery, divided by peak DBP; HR: heart rate; HRR: heart rate recovery at 1, 3, and 5 min into active recovery (HRR-1, HRR-3, HRR-5, respectively); ODI: oxygen desaturation index; OSA: obstructive sleep apnea; RER: respiratory exchange ratio; SBP: systolic blood pressure; SBP3: SBP at 3-min active recovery, divided by peak SBP; SaO290: percentage of total sleep time with SaO2 < 90%; VO2peak: peak oxygen consumption.
Significantly different between non-OSA and OSA participants (P < .05).
Statistically significant correlation (P < .05).