Figure 3

Heart rate and SpO 2 responses to acute rest and exercise under heat or hypoxic stress. The top panel shows the heart rate response during each trial; the bottom panel shows the SpO2 response during each trial. a = HEAT, HYP and COM different from to NORM (p < 0.05), b = COM different from HYP (p < 0.05), c = HEAT different from HYP (p < 0.05), d = COM different from NORM (p < 0.05), e = HYP and COM different from NORM and HEAT (p < 0.01).