Continuous thermoregulatory responses to mass-participation distance running in heat
Christopher Byrne, J. K W Lee, S. A N Chew, Chin Leong Lim, E. Y M Tan
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.
Medicine and Science in Sports and Exercise
https://doi.org/10.1249/01.mss.0000218134.74238.6a
Core temperature
Cumulative heat strain index
Fluid balance
Heat illness
10.1249/01.mss.0000218134.74238.6a
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Hot Temperature Medicine & Life Sciences 100%
Water-Electrolyte Balance Medicine & Life Sciences 67%
Temperature Medicine & Life Sciences 39%
Heart Rate Medicine & Life Sciences 26%
Humidity Medicine & Life Sciences 21%
Military Personnel Medicine & Life Sciences 20%
Dehydration Medicine & Life Sciences 19%
Technology Medicine & Life Sciences 12%
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. https://doi.org/10.1249/01.mss.0000218134.74238.6a
Byrne, Christopher ; Lee, J. K W ; Chew, S. A N ; Lim, Chin Leong ; Tan, E. Y M. / Continuous thermoregulatory responses to mass-participation distance running in heat. In: Medicine and Science in Sports and Exercise. 2006 ; Vol. 38, No. 5. pp. 803-810.
@article{a70d77f9d314427fbac60ae53d9bce85,
title = "Continuous thermoregulatory responses to mass-participation distance running in heat",
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 {\textcopyright} 2006 by the American College of Sports Medicine.",
keywords = "Core temperature, Cumulative heat strain index, Fluid balance, Heat illness, Hyperthermia",
author = "Christopher Byrne and Lee, {J. K W} and Chew, {S. A N} and Lim, {Chin Leong} and Tan, {E. Y M}",
doi = "10.1249/01.mss.0000218134.74238.6a",
journal = "Medicine and Science in Sports and Exercise",
publisher = "Lippincott, Williams and Wilkins",
Byrne, C, Lee, JKW, Chew, SAN, Lim, CL & Tan, EYM 2006, 'Continuous thermoregulatory responses to mass-participation distance running in heat', Medicine and Science in Sports and Exercise, vol. 38, no. 5, pp. 803-810. https://doi.org/10.1249/01.mss.0000218134.74238.6a
Continuous thermoregulatory responses to mass-participation distance running in heat. / Byrne, Christopher; Lee, J. K W; Chew, S. A N; Lim, Chin Leong; Tan, E. Y M.
In: Medicine and Science in Sports and Exercise, Vol. 38, No. 5, 05.2006, p. 803-810.
T1 - Continuous thermoregulatory responses to mass-participation distance running in heat
AU - Byrne, Christopher
AU - Lee, J. K W
AU - Chew, S. A N
AU - Lim, Chin Leong
AU - Tan, E. Y M
N2 - 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.
AB - 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.
KW - Core temperature
KW - Cumulative heat strain index
KW - Fluid balance
KW - Heat illness
KW - Hyperthermia
U2 - 10.1249/01.mss.0000218134.74238.6a
DO - 10.1249/01.mss.0000218134.74238.6a
JO - Medicine and Science in Sports and Exercise
JF - Medicine and Science in Sports and Exercise
Byrne C, Lee JKW, Chew SAN, Lim CL, Tan EYM. Continuous thermoregulatory responses to mass-participation distance running in heat. Medicine and Science in Sports and Exercise. 2006 May;38(5):803-810. https://doi.org/10.1249/01.mss.0000218134.74238.6a