FIGURE 2.

Time course of metabolic heat production ($\dot{M}$) during the total (a; data are expressed as a function of the immersion time completed by all subjects, including the final value obtained in each CWI), and the last 60 min (CWI_L‐60; b) period of the three successive cold‐water (20°C) immersions (CWI_A: 1st trial, CWI_B: 2nd trial, CWI_C: 3rd trial) performed in normoxia and hypoxia. B: baseline. Values are mean (95% CI). Data in all trials were significantly different from baseline (P ≤ 0.001). Significant difference # between CWI_A and CWI_B, † between CWI_A and CWI_C, § between the normoxic and hypoxic CWI_B, and * between the normoxic and hypoxic CWI_C