The effects of the oxygen consumption at respiratory muscles on aerobic capacity and exercise performance in hypobaric condition

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We have tried to investigate whether the oxygen consumption at the respiratory muscles compromise to whole body oxygen uptake (VO_2) and exercise performance during intensive exercise in hypobaric condition. In the present studies, we found that 1) the calculated VO_2 at respiratory muscles were lower in hypobaric condition than in sea level, 2) in hypobaria, itself (hypobaric normoxia), induces an increase in maximal ventilation and exercise performance, but maximal VO_2 and oxy-hemoglobin saturation do not change. These results suggested that hypobaria itself enhances the exercise performance without increase in VO_2, by the reduction in VO_2 at respiratory muscles in hypobaric condition, which could lead to higher oxygen supply to the active muscles.