Understanding the sleep of ultra-marathon swimmers: Guidance for coaches and swimmers Dunican, IC, Perry, EL, Gemma, M, Nesci, E and Roberts, Spencer 2022, Understanding the sleep of ultra-marathon swimmers: Guidance for coaches and swimmers, International Journal of Sports Science and Coaching, pp. 1-10, doi: 10.1177/17479541221089385. Attached Files Name Description MIMEType Size Downloads Title Understanding the sleep of ultra-marathon swimmers: Guidance for coaches and swimmers Author(s) Dunican, IC Perry, EL Gemma, M Nesci, E Roberts, Spencer orcid.org/0000-0002-9095-7070 Journal name International Journal of Sports Science and Coaching Article ID ARTN 17479541221089385 Start page 1 End page 10 Total pages 10 Publisher SAGE Place of publication London, Eng. Publication date 2022 ISSN 1747-9541 2048-397X Keyword(s) APNEA bodymass chronobiology DURATION HEALTH Hospitality, Leisure, Sport & Tourism INDEX masters' athletes PREVALENCE Psychology Psychology, Applied sleep apnea Social Sciences Social Sciences - Other Topics TEAM training Summary Open water swimming ultra-marathon events ≥10 km have become increasingly popular amongst master athletes. However, very little is known about the timing of training sessions and the impact on sleep. This study aimed to examine sleep behaviours, sleep problems and disorders and the relationship with training timings. This study used a longitudinal observational design for 42 nights with 24 masters' swimmers (n = 13 females), aged 39 ± 11 years, body mass index of 26 ± 3 kg/m2 during a training squad for an ocean ultra-swim (19.7 km) in Western Australia. Objective measures of sleep were obtained from a wrist-activity monitor, the Readiband™ (Fatigue Science Inc., Canada). Swimmers completed a survey instrument related to sleep problems, disorders, chronotype, anthropometric and demographic information. Generalised linear mixed models were fitted to examine relationships between predictor variables and sleep responses. Body mass index was associated with a decline in Total Sleep Time (TST), each one-unit increase in BMI was associated with 5 min less TST (p = 0.04). Swimmers with a “high risk” of sleep apnea had 21 min more wake time (p = 0.04) and 5% lower Sleep Efficiency (p = 0.04). Sleep Offset on the morning of a morning training session was earlier by 48 min (p < 0.001) resulting in less TST by 39 min (p < 0.001). This study provides evidence that coaches need to consider sleep behaviours and problems before designing training schedules. Swimmers need to plan and allocate an adequate sleep opportunity and those who have a suspected sleep disorder or problem should seek the support of a sleep physician. Language eng DOI 10.1177/17479541221089385 Field of Research 11 Medical and Health Sciences 17 Psychology and Cognitive Sciences HERDC Research category C1 Refereed article in a scholarly journal Persistent URL http://hdl.handle.net/10536/DRO/DU:30166506 Document type: Journal Article Collections: Faculty of Health School of Exercise and Nutrition Sciences Related Links Link Description Connect to published version Go to link with your DU access privileges   Connect to Elements publication management system Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Wed, 06 Apr 2022, 08:32:51 EST Wed, 06 Apr 2022, 08:50:46 EST Wed, 06 Apr 2022, 09:08:08 EST Thu, 14 Apr 2022, 10:31:33 EST Thu, 12 May 2022, 14:46:13 EST Thu, 30 Jun 2022, 09:31:57 EST Thu, 30 Jun 2022, 12:13:52 EST Thu, 30 Jun 2022, 12:18:38 EST Filtered Full Citation counts:   Cited 0 times in TR Web of Science Cited 0 times in Scopus Search Google Scholar Access Statistics: 24 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Wed, 06 Apr 2022, 08:32:51 EST