Table 3.

Correlations of cardiopulmonary capacity and the severity of OSA

Variable	VO2 max	DBP peak	BR peak	EQCO2 peak	HRR peak	HR peak, %predicted
AHI	−0.542*	0.572†	−0.420†	0.412†	−0.509†	−0.406†
Mean SpO2	0.161	−0.265	−0.240	0.36	−0.131	0.137
Lowest SpO2	0.099	−0.185	0.295	−0.11	−0.251	0.171
Epworth Sleeping Scale score	−0.137	−0.016	−0.249	0.03	−0.212	−0.172

^*P < 0.01.

^†P < 0.05.

OSA = obstructive sleep apnoea; VO₂, %predicted = peak oxygen consumption percentage of predicted; DBP = diastolic blood pressure; BR = respiratory reserve; EQCO₂ = ventilatory equivalent for CO₂; HRR = heart rate recovery; HR = heart rate; AHI = apnoea-hypopnea Index; SpO₂ = oxyhaemoglobin saturation.