The effects of caffeine during exercise in fire protective ensemble
To examine the effects of caffeine during exercise in fire protective ensemble (FPE), 10 healthy males completed 3 × 10 min bouts of treadmill exercise on two separate days. Sixty minutes prior to exercise either 6 mg/kg of caffeine (CAFF) or dextrose placebo
(PLA) capsules were ingested (randomly assigned, double blind). End-exercise gastrointestinal temperature (Tgi) was higher in CAFF compared to PLA (38.80 ± 0.08°C vs. 38.43 ± 0.11°C, p ≤ 0.01). Ventilation (V˙E) and tidal
volume (Vt) were also significantly higher in CAFF, which resulted in higher consumption of air from the self-contained breathing apparatus. While perceived exertion in the caffeine condition was decreased (p ≤ 0.05) compared to placebo, the higher Tgi values increased calculated
physiological strain index in CAFF (p ≤ 0.01). Caffeine appears to alter the physiological and psycho-physical responses to exercise in FPE and may influence factors related to work tolerance in firefighting. These findings are relevant to occupations such as firefighting where
workers are encapsulated during exposure to heavy physical work and/or environmental heat. The results indicate that workers may be more susceptible to heat-related fatigue, illness or injury with ingestion of significant amounts of caffeine. To the authors' knowledge this is the first study
involving humans and exercise to detect an increase in body temperature with caffeine ingestion.
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self-contained breathing apparatus
Document Type: Research Article
School of Kinesiology and Health Studies, Queens University, Kingston, Ontario, Canada
School of Exercise Science, Physical & Health Education, University of Victoria, Victoria, British Columbia, Canada
Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Alberta, Canada
November 1, 2009
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