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Int J Sports Med 2014; 35(11): 906-911
DOI: 10.1055/s-0033-1361186
Training & Testing
© Georg Thieme Verlag KG Stuttgart · New York

Thermoregulation, Hydration and Performance over 6 Days of Trail Running in the Tropics

O. Hue
1   Laboratoire ACTES, UPRES-EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Guadeloupe, France
,
S. Henri
1   Laboratoire ACTES, UPRES-EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Guadeloupe, France
2   Service d’orthopédie et traumatologie du CHRU de Pointe-à-Pitre Route de Chauvel, 97159 Pointe-à-Pitre Cedex, ­Guadeloupe, France
,
M. Baillot
1   Laboratoire ACTES, UPRES-EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Guadeloupe, France
,
S. Sinnapah
1   Laboratoire ACTES, UPRES-EA 3596, UFR-STAPS, Université des Antilles et de la Guyane, Guadeloupe, France
,
A.-P Uzel
2   Service d’orthopédie et traumatologie du CHRU de Pointe-à-Pitre Route de Chauvel, 97159 Pointe-à-Pitre Cedex, ­Guadeloupe, France
› Author Affiliations
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Publication History



accepted after revision 06 November 2013

Publication Date:
19 May 2014 (online)

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Abstract

The purpose of this study was to investigate thermal response, hydration and performance over a 6-day, 142-km trail running race in tropical conditions. 9 participants competed in the 2011 Gwadarun (30°C±2.4°C and 82±4% RH). Data were collected on days 1, 4 and 6. Gastrointestinal temperature (Tgi) and heart rate (HR) were measured using portable telemetry units, whereas blood samples were collected for hematocrit, osmolarity, plasma concentrations, alkaline reserves and creatine phosphokinase. The performances expressed in speed were correlated with both total body water and body mass loss per hour (TBWL.h−1 and ∆BM.h−1), HR and changes in Tgi per hour (∆Tgi.h−1): the more water and mass the participants lost, the higher the HR and the greater the Tgi change, and the better the performance. The ∆ Tgi.h−1 was significantly correlated with ∆BM.h−1, and the participants who lost the most mass had the greatest increases in Tgi. None of the blood parameters demonstrated significant changes. The present study showed that well-trained acclimated runners performing a 6-day trail race in a tropical environment and drinking ad libitum did not demonstrate heat-related illness or severe dehydration. Moreover, high performance was associated with increases in Tgi, TBW and BM losses per hour.

Key words

hot/wet climate - long-distance run - self-hydration
 

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