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Title: Continuous thermoregulatory responses to mass-participation distance running in heat
Authors: Byrne C.
Lee J.K.W. 
Chew S.A.N.
Lim C.L.
Tan E.Y.M.
Keywords: Core temperature
Cumulative heat strain index
Fluid balance
Heat illness
Issue Date: 2006
Citation: Byrne C., Lee J.K.W., Chew S.A.N., Lim C.L., Tan E.Y.M. (2006). Continuous thermoregulatory responses to mass-participation distance running in heat. Medicine and Science in Sports and Exercise 38 (5) : 803 - 810. ScholarBank@NUS Repository.
Abstract: Purpose: To continuously measure core temperature (Tc) and heart rate (HR), and quantify fluid balance during a 21-km mass-participation road race in warm, humid environmental conditions. Methods: Eighteen heat-acclimatized male soldiers ingested a telemetric Tc sensor on the evening prior to the race and wore an ambulatory Tc data recorder and HR monitor during the race. Pre- to postrace changes in nude body mass quantified fluid balance. Results: Environmental wet bulb globe temperature averaged 26.5°C. All runners finished the race asymptomatic of heat illness in a mean ± SD (range) time of 118 ± 13 (105-146) min. corresponding to an average running speed of 10.8 ± 1.1 (8.6-12.0) km·h-1. All runners recorded peak Tc > 39°C; 56% (N = 10) > 40°C; and 11% (N = 2) > 41°C. Peak Tc was 40.1 ± 0.7 (39.3-41.7) °C at 86 ± 36 (13-130) min, with Tc 39.9 ± 0.8 (38.3-41.7) °C at race finish. The magnitude of Tc response was unrelated (P > 0.05) to running time or fluid balance (e.g., fluid intake, % dehydration). Cumulative heat strain index was 2790 ± 1112 (1046-5144) units at race finish. Conclusion: Ingestible telemetric temperature sensors demonstrated utility for continuous measurement of T c during mass-participation running. Successful application of this technology has highlighted the magnitude and duration of Tc elevation that runners will voluntarily achieve during mass-participation distance races in heat and high humidity without medical consequence. Copyright © 2006 by the American College of Sports Medicine.
Source Title: Medicine and Science in Sports and Exercise
ISSN: 01959131
DOI: 10.1249/01.mss.0000218134.74238.6a
Appears in Collections:Staff Publications

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