Figure 4From: The role of oxygen-increased respirator in humans ascending to high altitude Effects of OIR on heart rate at high altitudes of 3,700 m, 4,000 m, 4,700 m, and 5,380 m. a P<0.05 and b P<0.01, as compared with ’Recovery without OIR’. c P<0.05, as compared with ’Rest without OIR’.Back to article page