Table 1.

Cardiorespiratory and perceptual responses at rest and during the final minute of constant-load exercise

		Hypoxia	Control	Normoxia
Exercise time (min)		3.6 ± 1.3†	3.6 ± 1.3†	8.1 ± 2.9
HR (b min−1)	Rest	72 ± 9*†	65 ± 11	65 ± 10
	Final	167 ± 14†	165 ± 15†	179 ± 13
(l min−1)	Rest	15 ± 4	15 ± 5	14 ± 2
	Final	158 ± 27*	116 ± 16†	160 ± 25
fR (b min−1)	Rest	13.8 ± 2.5	15.2 ± 1.8	13.0 ± 3.4
	Final	58.7 ± 13.8*	39.5 ± 7.0†	62.6 ± 1.8
VT (l)	Rest	1.32 ± 0.56	1.03 ± 0.37	1.18 ± 0.58
	Final	3.01 ± 0.60	3.20 ± 0.40	2.70 ± 0.50
(l min−1)	Rest	0.47 ± 0.13	0.48 ± 0.87	0.46 ± 0.66
	Final	4.50 ± 0.69	4.32 ± 0.45	4.44 ± 0.69
RPE, dyspnoea	Rest	0.1 ± 0.1	0.0 ± 0.1	0.0 ± 0.1
	Final	8.1 ± 2.4	6.2 ± 1.3†	9.1 ± 0.7
RPE, limb	Rest	0.0 ± 0.0	0.1 ± 0.3	0.2 ± 0.4
	Final	8.7 ± 1.9*	6.4 ± 1.7†	9.2 ± 0.8

Values are means ± SD for 9 participants. HR, heart rate. , minute ventilation; f_R, respiratory frequency; V_T, tidal volume; , O₂ uptake; , CO₂ output; RPE, ratings of perceived exertion. Note: resting values for hypoxia were measured during the final minute of the hypoxic wash-in; only HR increased from values attained before the wash-in (62 ± 12 beats min⁻¹, P < 0.05).

^*P < 0.05 vs. control at the same time point;

^†P < 0.05 vs. normoxia at the same time point.