Table 2.
Cardiopulmonary exercise test findings with respect to CPAP compliance.
| CPAP compliant (n=33) (mean [SD]) | CPAP noncompliant (n=32) (mean [SD]) | |||||
|---|---|---|---|---|---|---|
| First CPET | Control CPET | Pa | First CPET | Control CPET | Pa | |
|
| ||||||
| VO2 max (mL/min) | 1979.8 (622.2) | 1871.2 (459.9) | .100 | 1957.2 (435.6) | 1839.2 (419.6) | .065 |
| VO2 max. (%) | 87.4 (21.8) | 83.7 (18.6) | .196 | 78.3 (18.3) | 73.2 (16.1) | .053 |
| VO2 max/kg | 22.5 (6.6) | 21.3 (5.3) | .111 | 21.3 (5.7) | 19.9 (5.4) | .050 |
| VO2 max/kg (%) | 68.8 (18.8) | 65.9 (16.4) | .203 | 59.1 (16.5) | 55.0 (13.7) | .050 |
| VO2 (mL/min) | 2610.2 (777.6) | 2541.3 (624.5) | .334 | 2577.5 (602.6) | 2461.7 (597.6) | .143 |
| Work load (watt) | 137.6 (35.1) | 138.8 (33.0) | .601 | 148.0 (32.5) | 143.9 (33.9) | .043 |
| Work load (%) | 84.0 (16.3) | 85.0 (14.6) | .493 | 79.6 (17.9) | 77.1 (17.7) | .028 |
| AT (l/min) | 1.0 (0.3) | 0.9 (0.2) | .106 | 1.0 (0.3) | 0.9 (0.2) | .036 |
| AT (%pred max VO2) | 43.8 (14.2) | 41.1 (9.7) | .162 | 38.7 (12.7) | 34.3 (9.2) | .028 |
| HR (pulse/min) | 158.8 (16.0) | 154.7 (19.5) | .066 | 161.1 (18.2) | 156.3 (17.3) | .005 |
| HR (%) | 89.0 (7.8) | 86.8 (9.9) | .083 | 88.2 (8.2) | 85.4 (7.7) | .002 |
| O2 pulse (mL/pulse) | 12.4 (3.4) | 12.3 (2.9) | .798 | 12.0 (3.0) | 11.8 (2.5) | .505 |
| O2 pulse (%) | 98.6 (23.9) | 98.7 (21.7) | .958 | 88.8 (26.1) | 86.6 (21.8) | .410 |
| HRR | 19.8 (13.7) | 23.7 (17.5) | .088 | 21.6 (14.5) | 26.3 (13.4) | .005 |
| VE max (l/min) | 86.7 (28.4) | 80.3 (22.3) | .024 | 81.1 (21.5) | 76.3 (18.0) | .074 |
| VE max (%) | 74.0 (20.9) | 71.0 (16.8) | .301 | 68.7 (16.0) | 64.3 (13.5) | .046 |
| TV | 1.9 (0.5) | 1.8 (0.4) | .261 | 1.8 (0.5) | 1.8 (0.5) | .721 |
| TV (%) | 79.4 (15.2) | 83.7 (21.0) | .195 | 75.2 (16.7) | 74.2 (16.9) | .635 |
| RR | 42.1 (9.4) | 40.6 (8.2) | .062 | 40.8 (7.2) | 39.0 (7.9) | .030 |
| PetCO2 | 5.0 (0.5) | 5.1 (0.5) | .004 | 5.2 (0.4) | 5.2 (0.4) | .380 |
| PetO2 | 13.8 (0.6) | 13.6 (0.7) | .163 | 13.2 (0.6) | 13.1 (0.6) | .313 |
| VE/VO2 AT | 31.0 (5.2) | 30.2 (3.5) | .198 | 29.9 (2.7) | 30.5 (3.2) | .246 |
| VE/VVO2 AT | 28.4 (3.2) | 27.4 (2.6) | .003 | 27.4 (2.5) | 27.8 (2.7) | .399 |
a
P values for first and control CPET comparisons.
CPAP: Continuous positive airway pressure ventilation; AT: anaerobic threshold; HR: heart rate; HRR: heart rate reserve; RR: respiratory rate; TV: tidal volume; VE: ventilation.