期刊
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
卷 53, 期 2, 页码 367-374出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1249/MSS.0000000000002480
关键词
BURN SURVIVOR; HEAT STRESS; CORE TEMPERATURE
资金
- Department of Defense [W81XWH-15-1-0647]
- NIH [R01GM068865]
- Natural Sciences and Engineering Research Council of Canada Postdoctoral Fellowship
This study found that exercise intensity influences the relationship between burn injury size and thermoregulatory responses in a hot environment.
The U.S. Department of Defense's Medical Standards for Appointment, Enlistment, or Induction into the Military Services excludes personnel with burn injuries covering 18% or more of their body surface area (BSA). However, this requirement does not consider the metabolic heat loads associated with physical activities of different intensities that may influence a burn survivor's ability to perform his/her duties. Purpose This study aimed to test the hypothesis that the elevation in internal body temperature during exercise in a hot environment is influenced by the combination of exercise intensity and BSA burned. Methods Ten healthy participants (8 males, 2 females; 32 +/- 9 yr; 75.3 +/- 11.7 kg) completed eight exercise trials on a cycle ergometer, each with different combinations of metabolic heat productions (low, 4 W center dot kg(-1); moderate, 6 W center dot kg(-1)) and simulated BSA burn in a hot environmental chamber (39.9 degrees C +/- 0.3 degrees C, 20.1% +/- 1.5% RH). Burns were simulated by covering 0%, 20%, 40%, or 60% of participants' BSA with a highly absorbent, vapor-impermeable material. Gastrointestinal temperature (T-GI) was recorded, with the primary analysis being the increase in T-GI after 60 min of exercise. Results We identified an interaction effect for the increase in T-GI (P < 0.01), suggesting T-GI was influenced by both intensity and simulated burn BSA. Regardless of the percentage BSA burn simulated, the increase in T-GI was similar across low-intensity trials (0.70 degrees C +/- 0.26 degrees C, P > 0.11 for all). However, during moderate-intensity exercise, the increase in T-GI was greater for the 60% (1.78 degrees C +/- 0.38 degrees C, P < 0.01) and 40% BSA coverage trials (1.33 degrees C +/- 0.44 degrees C, P = 0.04), relative to 0% (0.82 degrees C +/- 0.36 degrees C). There were no differences in T-GI responses between 0% and 20% trials. Conclusion These data suggest that exercise intensity influences the relationship between burn injury size and thermoregulatory responses in a hot environment.
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