Breathing Reserve and Lung Function in Female Elite Runners.

Area of Science:

• Exercise Physiology
• Sports Science
• Respiratory Medicine

Background:

• Breathing reserve (BR) is the unutilized portion of maximal ventilation during exercise.
• Endurance-trained athletes typically exhibit a smaller BR than untrained individuals.
• Previous research predominantly focused on male athletes, overlooking potential sex-based differences in ventilatory limitation.

Purpose of the Study:

• To investigate sex differences in BR and lung function between endurance-trained females and matched untrained females.
• To determine if maximal oxygen uptake (VO2max) predicts BR in female athletes.
• To compare BR in female elite athletes with previously reported data from male athletes.

Main Methods:

• Cross-sectional study comparing 15 elite female runners with 15 matched untrained female controls (aged 24-33 years).
• Assessment of pulmonary function, maximal voluntary ventilation (MVV), maximal expiratory ventilation (VEmax), BR, and VO2max.
• Statistical analysis to compare groups and assess the association between VO2max and BR.

Main Results:

• Elite female runners had a median BR of 5%, significantly lower than the 21% found in untrained controls.
• No significant differences in pulmonary function tests were observed between the trained and untrained female groups.
• A moderate association was identified between VO2max and BR.

Conclusions:

• Endurance-trained females demonstrate a substantially lower breathing reserve compared to their untrained counterparts.
• The reduced BR in female elite runners is lower than that reported for male elite athletes, suggesting potentially greater ventilatory demand in female endurance athletes.
• These findings underscore the importance of considering sex-specific physiological responses in exercise and athletic performance.