![]() ![]() ![]() Upon the last HV in the WHBM and HV conditions, end-tidal CO 2 partial pressure (PETCO 2) values were 19 ± 3 and 17 ± 3 mmHg, indicative of respiratory alkalosis with estimated arterial pH increases of +0.171 and of +0.181, respectively. Finger SpO 2 dropped to 60 ± 12% at the end of the BHs. Despite large physiological effects in the SpO 2 and expired carbon dioxide (VCO 2) levels of both HV and WHBM, no significant positive or negative condition effects were found on RAST peak power, average power, or fatigue index. ![]() Gas exchange, heart rate, and finger pulse oxygen saturation (SpO 2) were monitored. Fifteen amateur runners performed a single WHBM session prior to a Repeated Ability Sprint Test (RAST) in comparison to voluntary HV or spontaneous breathing (SB) (control) in a randomized cross-over design. We determined the feasibility of implementing a single WHBM session before repeated sprinting performance and evaluated any acute ergogenic effects. It has been increasingly adopted by coaches and their athletes to improve performance, but there was no published research on its effects. The Wim Hof breathing method (WHBM) combines periods of hyperventilation (HV) followed by voluntary breath-holds (BH) at low lung volume. 3Swiss Athletics, Haus des Sports, Ittigen, Switzerland. ![]()
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