Effect of a training camp in the heat on nutritional intake of well-trained endurance athletes

Tiollier, E, Fabre, M, Louis, J ORCID: 0000-0002-9109-0958, Le Meur, Y, Schmit, C, Robach, P, Marquet, L-A and Hausswirth, C (2026) Effect of a training camp in the heat on nutritional intake of well-trained endurance athletes. Journal of Sports Sciences. pp. 1-12. ISSN 0264-0414

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Abstract

We investigated the effect of a training camp in the heat on energy and macronutrient intake and hunger. Twenty-two athletes completed two training periods (8 days each) of similar load. One group (HEAT, n = 14) trained successively in a temperate environment (10 ± 3°C, RH: 58 ± 11 %) and then in a hot environment (30 ± 5°C, RH: 74 ± 15%), while the other group (CON, n = 8) trained in the same temperate environment. Daily energy intake (EI), carbohydrate (CHO) and protein (PRO) intake were higher (p < 0.001) in HEAT (+23.9 ± 20.3%, +36.1 ± 24.3%, +27.5 ± 21.2%, respectively) during the heat camp compared with the temperate condition. More specifically, EI, CHO and PRO intake were greater at breakfast in HEAT (+90.1 ± 65.5%, +107.2 ± 74.3%, +69.8 ± 54.1 %, respectively). PRO intake also increased at dinner (p < 0.001) in HEAT. Mean EI and macronutrient intake during the training sessions were significantly increased (p < 0.01) in HEAT. Hunger was greater before breakfast in HEAT (p < 0.01) during the heat camp. In CON, none of the measures differed between the two training periods. These results suggest that athletes spontaneously increase their energy intake when training in the heat, with breakfast serving as the primary meal for this nutritional adjustment.

Item Type:	Article
Uncontrolled Keywords:	1106 Human Movement and Sports Sciences; 1302 Curriculum and Pedagogy; Sport Sciences; 3202 Clinical sciences; 4207 Sports science and exercise; 5201 Applied and developmental psychology
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine G Geography. Anthropology. Recreation > GV Recreation Leisure > GV561 Sports
Divisions:	Sport and Exercise Sciences
Publisher:	Taylor & Francis
Date of acceptance:	24 September 2026
Date of first compliant Open Access:	13 November 2026
Date Deposited:	12 Nov 2026 14:25
Last Modified:	13 Nov 2026 00:50
DOI or ID number:	10.1080/02640414.2026.2754629
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29807

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