Table 2.

Systemic hemodynamic and respiratory responses at rest and with increasing exercise intensity during normoxia and hypoxia

	Normoxia			Hypoxia
	Rest	10%	20%	Rest	10%	20%
Heart rate,* beats/min	61±2	66±3	70±3	75±2	79±3	85±4
MAP,† mmHg	89±3	91±3	94±3	91±3	91±3	93±3
Ventilation (BTPS), l/min−1	7.6±0.6	10.3±1.0‡	13.0±1.8	12.4±1.6§	23.1±3.1‡§	31.4±4.4‡§;
Pulse oximetery,* %	98±0	98±0	98±0	79±0	79±0	81±1
End-tidal CO2, %	5.5±0.2	5.3±0.2	5.4±0.1	5.4±0.1	5.5±0.1	5.5±0.1

Values are means ± SE. MAP, mean arterial pressure.

^*Main effect of hypoxia, P < 0.05.

^†Main effect of exercise, P < 0.05.

^‡P < 0.05 vs. previous exercise intensity.

^§P < 0.05 vs. normoxia.