Murphy, C, Svansdottir, SA, Dupuy, O and Louis, J (2024) Does overreaching from endurance-based training impair sleep: A systematic review and meta-analysis. PloS one, 19 (5). ISSN 1932-6203

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Abstract

Background Overreaching is often linked to a deterioration in sleep quality, yet a comprehensive review is lacking. The aim of this systemic review and meta-analysis was to synthesise the literature and quantify the effect of overreaching from endurance-based training on sleep quality. Method The review was conducted following the PRISMA guidelines. The final search was conducted in May 2023 using four electronic databases (Web of Science Core Collection, MEDLINE, Cochrane Central Database, SPORTDiscus). Studies were included for a qualitative review, while random-effects meta-analyses were conducted for objective and subjective sleep. Results and discussion The search returned 805 articles. Fourteen studies were included in the systematic review; Three and eight articles were eligible for the meta-analyses (objective and subjective, respectively). On average, the overreaching protocols were sixteen days in length (6 to 28 days) and included exercise modalities such as cycling (number of studies [k] = 5), rowing (k = 4), triathlon (k = 3), running (k = 2), and wimming (k = 1). Actigraphy was the only form of objective sleep measurement used across all studies (k = 3), while various instruments were used to capture subjective sleep quality (k = 13). When comparing objective sleep quality following the overreaching intervention to baseline (or a control), there was a significant reduction in sleep efficiency (mean difference = -2.0%; 95% CI -3.2, -0.8%; Glass’ Δ = -0.83; p < 0.01). In contrast, when comparing subjective sleep quality following the overreaching intervention to baseline (or a control), there was no effect on subjective sleep quality (Glass’ Δ = -0.27; 95% CI -0.79, 0.25; p = 0.08). Importantly, none of the included studies were judged to have a low risk of bias. While acknowledging the need for more high-quality studies, it appears that overreaching from endurance-based training can deteriorate objective sleep without influencing the perception of sleep quality.

Item Type:	Article
Uncontrolled Keywords:	Humans; Sleep; Physical Endurance; Endurance Training; Sleep Quality; Humans; Endurance Training; Sleep; Sleep Quality; Physical Endurance; General Science & Technology
Subjects:	R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions:	Sport & Exercise Sciences
Publisher:	Public Library of Science (PLoS)
SWORD Depositor:	A Symplectic
Date Deposited:	07 Jun 2024 10:12
Last Modified:	07 Jun 2024 10:15
DOI or ID number:	10.1371/journal.pone.0303748
Editors:	da Costa, JAHC
URI:	https://researchonline.ljmu.ac.uk/id/eprint/23446

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