Hypoxic-induced resting ventilatory and circulatory responses under multistep hypoxia is related to decline in peak aerobic capacity in hypoxia

Table 3 Cardiorespiratory variables during progressive hypoxia

	Differences between each oxygen level			One-way ANOVA results
	From 21 to 18% O₂	From 21 to 15% O₂	From 21 to 12% O₂	F	P	η²
ΔSaO₂, %	2.7±1.0	7.6±1.9^a	16.9±4.5^a,b	84.7	< 0.001	0.82
HVR, L min⁻¹ kg⁻¹	0.16±0.29	0.33±0.17^a	0.21±0.11	4.53	0.03	0.12
HCR, beats min⁻¹ %⁻¹	0.80±1.32	0.79±0.69	0.64±0.30	0.20	0.82	0.01

Values are mean ± SD. HVR, ventilatory response to hypoxia; HCR, cardiac response to hypoxia. ^a or ^b indicate significant differences vs. (21–18% O₂) or (21–15% O₂), respectively. Note that as ΔSaO₂ was calculated as the difference from the values of normoxia to hypoxia, and therefore, greater plus values indicate greater desaturation

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