Pre-Exercise Hyperpnea Attenuates Exercise-Induced Bronchoconstriction Without Affecting Performance.

Area of Science:

• Exercise Physiology
• Respiratory Medicine
• Pulmonary Function Testing

Background:

• Whole-body warm-up exercises are known to mitigate exercise-induced bronchoconstriction (EIB).
• The efficacy of intense pre-exercise hyperpnea in preventing EIB and its potential effects on exercise performance remain unclear.

Purpose of the Study:

• To investigate whether intense pre-exercise hyperpnea can attenuate EIB.
• To determine if such a warm-up strategy affects exercise performance in individuals with EIB.

Main Methods:

• Nine subjects with EIB underwent an exercise challenge preceded by four conditions: control warm-up, or 10 minutes of normocapnic hyperpnea at 50%, 70%, or variable intensity (80%/30%) of maximal voluntary ventilation.
• Forced expiratory volume in 1s (FEV1) and respiratory exertion were measured.
• Subsequent constant-load cycling tests assessed exercise performance.

Main Results:

• None of the hyperpnea warm-up conditions induced EIB.
• Intense hyperpnea significantly attenuated the maximal post-exercise decrease in FEV1 compared to control (p=0.006 for 70% intensity).
• Respiratory exertion perception was significantly reduced across all hyperpnea conditions (p≤0.048), and lung function recovered faster, with no significant differences in cycling performance.

Conclusions:

• Intense pre-exercise hyperpnea is an effective strategy for attenuating EIB severity.
• This breathing warm-up enhances lung function recovery post-exercise.
• Pre-exercise hyperpnea does not compromise exercise performance in individuals with EIB.