TY  - JOUR
IS  - 8
Y1  - 2022/02/13/
A1  - Racinais, Sebastien
A1  - Havenith, George
A1  - Aylwin, Polly
A1  - Ihsan, Mohammed
A1  - Taylor, Lee
A1  - Adami, Paolo Emilio
A1  - Adamuz, Maria-Carmen
A1  - Alhammoud, Marine
A1  - Alonso, Juan Manuel
A1  - Bouscaren, Nicolas
A1  - Buitrago, Sebastian
A1  - Cardinale, Marco
A1  - van Dyk, Nicol
A1  - Esh, Chris J
A1  - Gomez-Ezeiza, Josu
A1  - Garrandes, Frederic
A1  - Holtzhausen, Louis
A1  - Labidi, Mariem
A1  - Lange, Gunter
A1  - Lloyd, Alexander
A1  - Moussay, Sebastien
A1  - Mtibaa, Khouloud
A1  - Townsend, Nathan
A1  - Wilson, Mathew G
A1  - Bermon, Stephane
PB  - BMJ PUBLISHING GROUP
N2  - Purpose To determine associations between thermal responses, medical events, performance, heat acclimation and health status during a World Athletics Championships in hot-humid conditions. Methods From 305 marathon and race-walk starters, 83 completed a preparticipation questionnaire on health and acclimation. Core (Tcore; ingestible pill) and skin (Tskin; thermal camera) temperatures were measured in-competition in 56 and 107 athletes, respectively. 70 in-race medical events were analysed retrospectively. Performance (% personal best) and did not finish (DNF) were extracted from official results. Results Peak Tcore during competition reached 39.6°C±0.6°C (maximum 41.1°C). Tskin decreased from 32.2°C±1.3°C to 31.0°C±1.4°C during the races (p<0.001). Tcore was not related to DNF (25% of starters) or medical events (p?0.150), whereas Tskin, Tskin rate of decrease and Tcore-to-Tskin gradient were (p?0.029). A third of the athletes reported symptoms in the 10 days preceding the event, mainly insomnia, diarrhoea and stomach pain, with diarrhoea (9% of athletes) increasing the risk of in-race medical events (71% vs 17%, p<0.001). Athletes (63%) who performed 5?30 days heat acclimation before the competition: ranked better (18±13 vs 28±13, p=0.009), displayed a lower peak Tcore (39.4°C±0.4°C vs 39.8°C±0.7°C, p=0.044) and larger in-race decrease in Tskin (?1.4°C±1.0°C vs ?0.9°C±1.2°C, p=0.060), than non-acclimated athletes. Although not significant, they also showed lower DNF (19% vs 30%, p=0.273) and medical events (19% vs 32%, p=0.179). Conclusion Tskin, Tskin rate of decrease and Tcore-to-Tskin gradient were important indicators of heat tolerance. While heat-acclimated athletes ranked better, recent diarrhoea represented a significant risk factor for DNF and in-race medical events.
VL  - 56
ID  - discovery10169137
N1  - http://creativecommons.org/licenses/by-nc/4.0/
This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
SN  - 0306-3674
JF  - British Journal of Sports Medicine
EP  - 445
AV  - public
UR  - http://dx.doi.org/10.1136/bjsports-2021-104569
SP  - 439
TI  - Association between thermal responses, medical events, performance, heat acclimation and health status in male and female elite athletes during the 2019 Doha World Athletics Championships
KW  - Science & Technology
KW  -  Life Sciences & Biomedicine
KW  -  Sport Sciences
KW  -  exercise
KW  -  hot temperature
KW  -  EXERCISE
KW  -  STRATEGIES
KW  -  SYMPTOMS
KW  -  COHORT
KW  -  SEX
ER  -