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Exercise capacity and exercise-induced bronchoconstriction (EIB) in a cold environment.

T Stensrud¹, S Berntsen, K-H Carlsen

¹Norwegian School of Sport Sciences, P.O. Box 4014 Ullevaal Stadion, NO-0806 Oslo, Norway. trine.stensrud@nih.no

Respiratory Medicine

|February 24, 2007

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Cold environments significantly reduce exercise capacity and worsen exercise-induced bronchoconstriction (EIB) in individuals with EIB. This study highlights the impact of temperature on athletic performance and respiratory health.

Area of Science:

Sports Medicine
Environmental Physiology
Respiratory Medicine

Background:

Exercise in cold environments can exacerbate exercise-induced bronchoconstriction (EIB).
The impact of cold environments on exercise capacity in individuals with EIB remains under-investigated.

Purpose of the Study:

To determine how environmental temperature influences exercise capacity (peak oxygen uptake, peak ventilation, peak running speed) in subjects with diagnosed EIB.
To evaluate the effect of environmental temperature on the severity of EIB.

Main Methods:

Twenty subjects with EIB performed treadmill running tests in both a temperate (20.2°C) and a cold (-18.0°C) environment.
Measurements included oxygen uptake, ventilation, respiratory exchange ratio, heart rate, and running speed.

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Lung function (FEV1) was assessed pre- and post-exercise to quantify EIB.

Main Results:

Peak oxygen uptake decreased by 6.5% and peak running speed was significantly lower in the cold environment (p=0.004 and p=0.02, respectively).
The post-exercise reduction in FEV1, indicating EIB severity, significantly increased in the cold (p=0.04).
No significant differences were observed in peak ventilation, RER, or heart rate between conditions.

Conclusions:

Exercise capacity is markedly reduced in a cold environment for individuals with EIB.
Cold exposure intensifies exercise-induced bronchoconstriction in this population.