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Incidence and predictors of exertional hyperthermia after a 15-km road race in cool environmental conditions

Veltmeijer, MTW and Eijsvogels, TM and Thijssen, DHJ and Hopman, MTE (2015) Incidence and predictors of exertional hyperthermia after a 15-km road race in cool environmental conditions. Journal of Science and Medicine in Sport, 18 (3). pp. 333-337. ISSN 1878-1861

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Abstract

Objectives: Current knowledge about the incidence and risk factors for exertional hyperthermia (core body temperature ≥40. °C) is predominantly based on military populations or small-sized studies in athletes. We assessed the incidence of exertional hyperthermia in 227 participants of a 15-km running race, and identified predictors for exertional hyperthermia. Design: Observational study. Methods: We measured intestinal core body temperature before and immediately after the race. To identify predictive factors of maximum core body temperature, we entered sex, age, BMI, post-finish dehydration, number of training weeks, fluid intake before and during the race, finish time, and core body temperature change during warming-up into a backward linear regression analysis. Additionally, two subgroups of hyperthermic and non-hyperthermic participants were compared. Results: In a WBGT of 11. °C, core body temperature increased from 37.6. ±. 0.4. °C at baseline to 37.8. ±. 0.4. °C after warming-up, and 39.2. ±. 0.7. °C at the finish. A total of 15% of all participants had exertional hyperthermia at the finish. Age, BMI, fluid intake before the race and the core body temperature change during warming-up significantly predicted maximal core body temperature (. p<. 0.001). Participants with hyperthermia at the finish line had a significantly greater core body temperature rise (. p<. 0.01) during the warming-up compared to non-hyperthermic peers, but similar race times (. p=. 0.46). Conclusions: 15% of the recreational runners developed exertional hyperthermia, whilst core body temperature change during the warming-up was identified as strongest predictor for core body temperature at the finish. This study emphasizes that exertional hyperthermia is a common phenomenon in recreational athletes, and can be partially predicted.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement And Sports Science, 1117 Public Health And Health Services
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Elsevier
Date Deposited: 08 Mar 2016 09:04
Last Modified: 18 Nov 2016 16:45
DOI or Identification number: 10.1016/j.jsams.2014.04.007
URI: http://researchonline.ljmu.ac.uk/id/eprint/2684

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