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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 1440-2440

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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 SCI LTD
Related URLs:
Date Deposited: 05 Feb 2016 12:40
Last Modified: 05 Feb 2016 12:40
DOI or Identification number: 10.1016/j.jsams.2014.04.007
URI: http://researchonline.ljmu.ac.uk/id/eprint/2837

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