Thomas, C, Langan-Evans, C, Germaine, M, Artukovic, M, Jones, H, Whitworth-Turner, C, Close, GL and Louis, J (2023) Case Report: Effect of low energy availability and training load on sleep in a male combat sport athlete. Frontiers in Sports and Active Living, 4. ISSN 2624-9367

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Abstract

Purpose: The aim of this case report was to describe the sleep responses in a male combat sport athlete, who was engaging in both chronic (CWL) and acute (AWL) weight loss practices in order to reduce body mass for a national competition.
Methods: During the first seven weeks of training (Phases 1 and 2), the athlete adhered to a daily energy intake (EI) equating to their resting metabolic rate (1700 kcal·day−1) followed by a reduction in EI (915–300 kcal·day−1) in the 5 days before weighing in (Phase 3). Nocturnal sleep was monitored throughout the 8-week training period using wristwatch actigraphy and frequent measurements of body mass/composition, daily exercise energy expenditure and training load (TL) were taken.
Results: The athlete was in a state of low energy availability (LEA) during the entire training period. There was a very large decrease in LEA status during phase 3 compared with phases 1 and 2 (3 vs. 20 kcal·kgFFM·day−1) and there was a small decrease in TL during phase 3 compared with phase 2 (410 vs. 523 AU). The athlete's sleep efficiency increased throughout the training period, but total sleep time displayed a small to moderate decrease in phase 3 compared with phases 1 and 2 (386 vs. 429 and 430 min). However, correlational analysis demonstrated trivial to small, non-significant relationships between sleep characteristics and the athlete's LEA status and TL.
Conclusion: These findings suggest that CWL and AWL practices that cause fluctuations in LEA and TL may be implemented without compromising the sleep of combat sport athletes.

Item Type:	Article
Uncontrolled Keywords:	actigraphy; energy expenditure; energy restriction; training load; weight making
Subjects:	Q Science > QH Natural history > QH301 Biology R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry R Medicine > RC Internal medicine > RC1200 Sports Medicine G Geography. Anthropology. Recreation > GV Recreation Leisure > GV561 Sports
Divisions:	Sport & Exercise Sciences
Publisher:	Frontiers Media SA
SWORD Depositor:	A Symplectic
Date Deposited:	02 Mar 2023 10:25
Last Modified:	02 Mar 2023 10:25
DOI or ID number:	10.3389/fspor.2022.981755
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18984

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