Core temperature up to 41.5ºC during the UCI Road Cycling World Championships in the heat

Sebastien Racinais, Sebastien Moussay, David Nichols, Gavin Travers, Taoufik Belfekih, Yorck Olaf Schumacher, Julien D Periard

Research output: Contribution to journalArticle

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Abstract

OBJECTIVE: To characterise the core temperature response and power output profile of elite male and female cyclists during the 2016 UCI Road World Championships. This may contribute to formulating environmental heat stress policies.

METHODS: Core temperature was recorded via an ingestible capsule in 10, 15 and 15 cyclists during the team time trial (TTT), individual time trial (ITT) and road race (RR), respectively. Power output and heart rate were extracted from individual cycling computers. Ambient conditions in direct sunlight were hot (37°C±3°C) but dry (25%±16% relative humidity), corresponding to a wet-bulb globe temperature of 27°C±2°C.

RESULTS: Core temperature increased during all races (p<0.001), reaching higher peak values in TTT (39.8°C±0.9°C) and ITT (39.8°C±0.4°C), relative to RR (39.2°C±0.4°C, p<0.001). The highest temperature recorded was 41.5°C (TTT). Power output was significantly higher during TTT (4.7±0.3 W/kg) and ITT (4.9±0.5 W/kg) than RR (2.7±0.4 W/kg, p<0.001). Heart rate increased during the TTs (p<0.001) while power output decreased (p<0.001).

CONCLUSION: 85% of the cyclists participating in the study (ie, 34 of 40) reached a core temperature of at least 39°C with 25% (ie, 10 of 40) exceeding 40°C. Higher core temperatures were reached during the time trials than the RR.

Original languageEnglish
JournalBritish Journal of Sports Medicine
DOIs
Publication statusE-pub ahead of print - 1 Dec 2018
Externally publishedYes

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Hot Temperature
Temperature
Heart Rate
Sunlight
Humidity
Capsules

Cite this

Racinais, Sebastien ; Moussay, Sebastien ; Nichols, David ; Travers, Gavin ; Belfekih, Taoufik ; Schumacher, Yorck Olaf ; Periard, Julien D. / Core temperature up to 41.5ºC during the UCI Road Cycling World Championships in the heat. In: British Journal of Sports Medicine. 2018.
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abstract = "OBJECTIVE: To characterise the core temperature response and power output profile of elite male and female cyclists during the 2016 UCI Road World Championships. This may contribute to formulating environmental heat stress policies.METHODS: Core temperature was recorded via an ingestible capsule in 10, 15 and 15 cyclists during the team time trial (TTT), individual time trial (ITT) and road race (RR), respectively. Power output and heart rate were extracted from individual cycling computers. Ambient conditions in direct sunlight were hot (37°C±3°C) but dry (25{\%}±16{\%} relative humidity), corresponding to a wet-bulb globe temperature of 27°C±2°C.RESULTS: Core temperature increased during all races (p<0.001), reaching higher peak values in TTT (39.8°C±0.9°C) and ITT (39.8°C±0.4°C), relative to RR (39.2°C±0.4°C, p<0.001). The highest temperature recorded was 41.5°C (TTT). Power output was significantly higher during TTT (4.7±0.3 W/kg) and ITT (4.9±0.5 W/kg) than RR (2.7±0.4 W/kg, p<0.001). Heart rate increased during the TTs (p<0.001) while power output decreased (p<0.001).CONCLUSION: 85{\%} of the cyclists participating in the study (ie, 34 of 40) reached a core temperature of at least 39°C with 25{\%} (ie, 10 of 40) exceeding 40°C. Higher core temperatures were reached during the time trials than the RR.",
author = "Sebastien Racinais and Sebastien Moussay and David Nichols and Gavin Travers and Taoufik Belfekih and Schumacher, {Yorck Olaf} and Periard, {Julien D}",
note = "{\circledC} Author(s) (or their employer(s)) 2018. No commercial re-use. See rights and permissions. Published by BMJ.",
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doi = "10.1136/bjsports-2018-099881",
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Core temperature up to 41.5ºC during the UCI Road Cycling World Championships in the heat. / Racinais, Sebastien; Moussay, Sebastien; Nichols, David; Travers, Gavin; Belfekih, Taoufik; Schumacher, Yorck Olaf; Periard, Julien D.

In: British Journal of Sports Medicine, 01.12.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Core temperature up to 41.5ºC during the UCI Road Cycling World Championships in the heat

AU - Racinais, Sebastien

AU - Moussay, Sebastien

AU - Nichols, David

AU - Travers, Gavin

AU - Belfekih, Taoufik

AU - Schumacher, Yorck Olaf

AU - Periard, Julien D

N1 - © Author(s) (or their employer(s)) 2018. No commercial re-use. See rights and permissions. Published by BMJ.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - OBJECTIVE: To characterise the core temperature response and power output profile of elite male and female cyclists during the 2016 UCI Road World Championships. This may contribute to formulating environmental heat stress policies.METHODS: Core temperature was recorded via an ingestible capsule in 10, 15 and 15 cyclists during the team time trial (TTT), individual time trial (ITT) and road race (RR), respectively. Power output and heart rate were extracted from individual cycling computers. Ambient conditions in direct sunlight were hot (37°C±3°C) but dry (25%±16% relative humidity), corresponding to a wet-bulb globe temperature of 27°C±2°C.RESULTS: Core temperature increased during all races (p<0.001), reaching higher peak values in TTT (39.8°C±0.9°C) and ITT (39.8°C±0.4°C), relative to RR (39.2°C±0.4°C, p<0.001). The highest temperature recorded was 41.5°C (TTT). Power output was significantly higher during TTT (4.7±0.3 W/kg) and ITT (4.9±0.5 W/kg) than RR (2.7±0.4 W/kg, p<0.001). Heart rate increased during the TTs (p<0.001) while power output decreased (p<0.001).CONCLUSION: 85% of the cyclists participating in the study (ie, 34 of 40) reached a core temperature of at least 39°C with 25% (ie, 10 of 40) exceeding 40°C. Higher core temperatures were reached during the time trials than the RR.

AB - OBJECTIVE: To characterise the core temperature response and power output profile of elite male and female cyclists during the 2016 UCI Road World Championships. This may contribute to formulating environmental heat stress policies.METHODS: Core temperature was recorded via an ingestible capsule in 10, 15 and 15 cyclists during the team time trial (TTT), individual time trial (ITT) and road race (RR), respectively. Power output and heart rate were extracted from individual cycling computers. Ambient conditions in direct sunlight were hot (37°C±3°C) but dry (25%±16% relative humidity), corresponding to a wet-bulb globe temperature of 27°C±2°C.RESULTS: Core temperature increased during all races (p<0.001), reaching higher peak values in TTT (39.8°C±0.9°C) and ITT (39.8°C±0.4°C), relative to RR (39.2°C±0.4°C, p<0.001). The highest temperature recorded was 41.5°C (TTT). Power output was significantly higher during TTT (4.7±0.3 W/kg) and ITT (4.9±0.5 W/kg) than RR (2.7±0.4 W/kg, p<0.001). Heart rate increased during the TTs (p<0.001) while power output decreased (p<0.001).CONCLUSION: 85% of the cyclists participating in the study (ie, 34 of 40) reached a core temperature of at least 39°C with 25% (ie, 10 of 40) exceeding 40°C. Higher core temperatures were reached during the time trials than the RR.

U2 - 10.1136/bjsports-2018-099881

DO - 10.1136/bjsports-2018-099881

M3 - Article

JO - British Journal of Sports Medicine

JF - British Journal of Sports Medicine

SN - 0306-3674

ER -