Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2015 ) 14 , 263 - 268

Research article
Hydration and Thermoregulation During a Half-Ironman Performed in Tropical Climate
Michelle Baillot , Olivier Hue
Author Information
Laboratoire ACTES, Université des Antilles et de la Guyane, Campus de Fouillole, France

Michelle Baillot
✉ Laboratoire ACTES, EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Campus de Fouillole, France
Email: mibaillot@gmail.com
Publish Date
Received: 20-11-2014
Accepted: 15-01-2015
Published (online): 23-06-2015
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ABSTRACT

The aim of this study was to compare the core temperature (TC) and markers of hydration status in athletes performing a half Ironman triathlon race in hot and humid conditions (27.2 ± 0.5°C, relative humidity was 80 ± 2%). Before and immediately after the 2012 Guadeloupe half Ironman triathlon, body mass and urine osmolarity (mean ± SD) were measured in 19 well-trained male triathletes. TC was measured before and after the race, and at each transition during the event, using an ingestible pill telemetry system. Ambient temperature and heart rate (HR) were measured throughout the race. Mean ± SD performance time was 331 ± 36 minutes and HR was 147 ± 16 beats·min-1. Wet bulb globe temperature (WBGT) averaged 25.4 ± 1.0°C and ocean temperature was 29.5°C. The average TC at the beginning of the race (TC1) was 37.1 ± 0.7°C; it was 37.8 ± 0.9°C after swimming (TC2), 37.8 ± 1.0°C after cycling (TC3), and (TC4) 38.4 ± 0.7°C after running. Body mass significantly declined during the race by 3.7 ± 1.9 kg (4.8 ± 2.4%; p < 0.05), whereas urine osmolarity significantly increased from 491.6 ± 300.6 to 557.9 ± 207.9 mosm·L-1 (p < 0.05). Changes in body mass were not related to finishing TC or urine osmolarity. Ad libitum fluid intake appears applicable to athletes acclimatized to tropical climate, when performing a half Ironman triathlon in a warm and humid environment.

Key words: Aerobic exercise, triathlon, hygrometry, hydration


           Key Points
  • Ad libitum fluid intake appears applicable to athletes acclimatized to tropical climate when performing a half Ironman triathlon in a warm and humid environment.
  • The final core temperature average was 38.8 ± 0.7ºC after the event in these triathletes and the athletes showed no evidence of heat illness while competing in a warm and humid environment.
  • Core temperature was dependent on both activity and anthropometry.
 
 
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