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Table 1 Resting ventilatory, cardiovascular, and hematologic responses in hypobaric hypoxia (HH) and normobaric hypoxia (NH)

From: Cycling performance decrement is greater in hypobaric versus normobaric hypoxia

Group Condition VE (BTPS) (l · min -1) PETO 2(mmHg) PETCO 2(mmHg) SaO 2(%) HR (bpm) MAP (mmHg) Hb (mg/dl) Hct (%)
HH (n = 6) SL 11.1 ± 2.2 105.8 ± 5.8 39.4 ± 3.3 97.2 ± 1.4 68.0 ± 9.8 85.5 ± 4.1 15.9 ± 0.7 46.7 ± 1.9
HYP 13.0 ± 3.1 47.2 ± 2.4* 40.1 ± 4.3 79.6 ± 4.2* 71.8 ± 8.3 86.8 ± 6.5 15.5 ± 0.7 45.6 ± 2.2
NH (n = 6) SL 10.8 ± 1.3 102.8 ± 2.3 39.0 ± 1.9 98.0 ± 0.9 67.7 ± 3.0 86.5 ± 6.2 15.7 ± 1.1 46.1 ± 3.3
HYP 11.1 ± 1.6 46.6 ± 2.8* 36.8 ± 1.6 78.5 ± 3.4* 70.7 ± 2.6 84.2 ± 2.9 15.2 ± 0.6 44.7 ± 1.9
  1. Mean ± SD; *P < 0.05 from SL; P < 0.05 between groups. SL sea level, HYP hypoxia, VE minute ventilation, PETO 2 partial pressure of end-tidal oxygen, PETCO 2 partial pressure of end-tidal carbon dioxide, SaO 2 arterial oxygen saturation, HR heart rate, MAP mean arterial pressure, [Hb] hemoglobin concentration, Hct hematocrit.