Effect of warm-up exercise on exercise-induced bronchoconstriction.

Area of Science:

• Sports Medicine
• Pulmonary Physiology
• Exercise Science

Background:

• Exercise-induced bronchoconstriction (EIB) is airway narrowing following strenuous physical activity.
• Pre-exercise warm-up routines are commonly employed to mitigate EIB by inducing a refractory period.
• Evaluating the efficacy of different warm-up protocols is crucial for managing EIB.

Purpose of the Study:

• To systematically review and evaluate the effectiveness of pre-exercise warm-up routines in attenuating EIB.
• To compare the impact of various warm-up intensities and types on EIB severity.

Main Methods:

• A systematic literature search was conducted to identify relevant randomized studies, minimizing bias.
• Pre-exercise warm-up protocols were categorized into interval high intensity, continuous low intensity, continuous high intensity, and variable intensity.
• The primary outcome measure was the percent fall in forced expiratory volume in 1 second (FEV1) post-exercise, with mean differences (MD) and 95% confidence intervals (CI) reported.

Main Results:

• Seven randomized controlled trials met the inclusion criteria for the review.
• High-intensity interval warm-ups (MD = -10.6%) and variable intensity warm-ups (MD = -10.9%) significantly attenuated the fall in FEV1.
• Continuous low-intensity (MD = -12.6%) and continuous high-intensity (MD = -9.8%) warm-ups did not produce statistically significant reductions in EIB.

Conclusions:

• High-intensity interval and variable intensity pre-exercise warm-ups demonstrate the most consistent and effective attenuation of EIB.
• These findings suggest that incorporating high-intensity exercise into warm-up strategies is a viable short-term, non-pharmacological method for reducing EIB.
• Optimal warm-up strategies may involve elements of high-intensity exercise to prevent exercise-induced airway narrowing.