The impact of sleepwear fiber type on sleep quality under warm ambient conditions

Chin Moi Chow,1,2 Mirim Shin,2 Trevor J Mahar,3 Mark Halaki,1,2 Angus Ireland31Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia; 2Exercise, Heath & Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia; 3Australian Wool Innov...

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Autores principales:	Chow CM, Shin M, Mahar TJ, Halaki M, Ireland A
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	cotton polyester wool polysomnography thermal comfort Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
Acceso en línea:	https://doaj.org/article/b6a22521de5d47fab380266255c61ed1
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spelling	oai:doaj.org-article:b6a22521de5d47fab380266255c61ed12021-12-02T11:05:45ZThe impact of sleepwear fiber type on sleep quality under warm ambient conditions1179-1608https://doaj.org/article/b6a22521de5d47fab380266255c61ed12019-08-01T00:00:00Zhttps://www.dovepress.com/the-impact-of-sleepwear-fiber-type-on-sleep-quality-under-warm-ambient-peer-reviewed-article-NSShttps://doaj.org/toc/1179-1608Chin Moi Chow,1,2 Mirim Shin,2 Trevor J Mahar,3 Mark Halaki,1,2 Angus Ireland31Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia; 2Exercise, Heath & Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia; 3Australian Wool Innovation Limited, The Woolmark Company, Sydney, NSW, AustraliaCorrespondence: Chin Moi ChowDiscipline of Exercise and Sport Science, The University of Sydney, 75 East street, Lidcombe, NSW 2141, AustraliaTel +61 2 9351 9332Email chin-moi.chow@sydney.edu.auBackground: Sleep disturbance in adults with no health concerns is often linked to the thermal environment. This study assesses the impact on sleep quality of sleepwear made from fibers with different thermal insulation and hygral properties. This randomized cross-over study investigated the effects on sleep quality of sleepwear made from cotton, polyester and Merino wool in adults aged 50–70 years, at an ambient temperature of 30 °C and a relative humidity of 50%.Methods: Thirty-six healthy participants completed four nights of sleep study with polysomnography. Participants were categorized by body mass index as <25 kg·m−2 or ≥25 kg·m−2, age as <65 years or ≥65 years, and by Pittsburgh Sleep Quality Index (PSQI) as poor sleepers (PSQI≥5) or good sleepers (PSQI<5).Results: Small, but statistically significant sleep benefits were observed for wool over cotton and polyester sleepwear for multiple sleep parameters, while neither cotton nor polyester was responsible for any statistically significant sleep benefit over the 11 sleep parameters examined. The key findings were: 1) A significant sleepwear effect was observed for sleep onset latency (SOL), p=0.04. 2) For older participants, sleeping in wool significantly reduced SOL (12.4 mins) compared with cotton (26.7 mins, p=0.001) or polyester (21.6 mins, p=0.001). 3) A statistically significant effect was found for sleep fragmentation index (p=0.01) in which wool sleepwear (12.1 no·h−1) was lower than polyester (13.7 no·h−1) (p=0.005), but not different to cotton (13.3 no·h−1). 4) Poor sleepers had less wakefulness when sleeping in wool compared to cotton (p=0.047). 5) And Poor sleepers had higher rapid eye movement sleep latency in polyester than in cotton (p=0.037) or in wool (p=0.036).Conclusion: Statistically significant benefits for wool sleepwear were observed on average for all participants and, in particular, for the older and poorer sleepers. There were no significant differences in any sleep variables between sleepwear types for the BMI sub-group. Keywords: cotton, polyester, wool, polysomnography, thermal comfortChow CMShin MMahar TJHalaki MIreland ADove Medical Pressarticlecottonpolyesterwoolpolysomnographythermal comfortPsychiatryRC435-571Neurophysiology and neuropsychologyQP351-495ENNature and Science of Sleep, Vol Volume 11, Pp 167-178 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	cotton polyester wool polysomnography thermal comfort Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495
spellingShingle	cotton polyester wool polysomnography thermal comfort Psychiatry RC435-571 Neurophysiology and neuropsychology QP351-495 Chow CM Shin M Mahar TJ Halaki M Ireland A The impact of sleepwear fiber type on sleep quality under warm ambient conditions
description	Chin Moi Chow,1,2 Mirim Shin,2 Trevor J Mahar,3 Mark Halaki,1,2 Angus Ireland31Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia; 2Exercise, Heath & Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, NSW, Australia; 3Australian Wool Innovation Limited, The Woolmark Company, Sydney, NSW, AustraliaCorrespondence: Chin Moi ChowDiscipline of Exercise and Sport Science, The University of Sydney, 75 East street, Lidcombe, NSW 2141, AustraliaTel +61 2 9351 9332Email chin-moi.chow@sydney.edu.auBackground: Sleep disturbance in adults with no health concerns is often linked to the thermal environment. This study assesses the impact on sleep quality of sleepwear made from fibers with different thermal insulation and hygral properties. This randomized cross-over study investigated the effects on sleep quality of sleepwear made from cotton, polyester and Merino wool in adults aged 50–70 years, at an ambient temperature of 30 °C and a relative humidity of 50%.Methods: Thirty-six healthy participants completed four nights of sleep study with polysomnography. Participants were categorized by body mass index as <25 kg·m−2 or ≥25 kg·m−2, age as <65 years or ≥65 years, and by Pittsburgh Sleep Quality Index (PSQI) as poor sleepers (PSQI≥5) or good sleepers (PSQI<5).Results: Small, but statistically significant sleep benefits were observed for wool over cotton and polyester sleepwear for multiple sleep parameters, while neither cotton nor polyester was responsible for any statistically significant sleep benefit over the 11 sleep parameters examined. The key findings were: 1) A significant sleepwear effect was observed for sleep onset latency (SOL), p=0.04. 2) For older participants, sleeping in wool significantly reduced SOL (12.4 mins) compared with cotton (26.7 mins, p=0.001) or polyester (21.6 mins, p=0.001). 3) A statistically significant effect was found for sleep fragmentation index (p=0.01) in which wool sleepwear (12.1 no·h−1) was lower than polyester (13.7 no·h−1) (p=0.005), but not different to cotton (13.3 no·h−1). 4) Poor sleepers had less wakefulness when sleeping in wool compared to cotton (p=0.047). 5) And Poor sleepers had higher rapid eye movement sleep latency in polyester than in cotton (p=0.037) or in wool (p=0.036).Conclusion: Statistically significant benefits for wool sleepwear were observed on average for all participants and, in particular, for the older and poorer sleepers. There were no significant differences in any sleep variables between sleepwear types for the BMI sub-group. Keywords: cotton, polyester, wool, polysomnography, thermal comfort
format	article
author	Chow CM Shin M Mahar TJ Halaki M Ireland A
author_facet	Chow CM Shin M Mahar TJ Halaki M Ireland A
author_sort	Chow CM
title	The impact of sleepwear fiber type on sleep quality under warm ambient conditions
title_short	The impact of sleepwear fiber type on sleep quality under warm ambient conditions
title_full	The impact of sleepwear fiber type on sleep quality under warm ambient conditions
title_fullStr	The impact of sleepwear fiber type on sleep quality under warm ambient conditions
title_full_unstemmed	The impact of sleepwear fiber type on sleep quality under warm ambient conditions
title_sort	impact of sleepwear fiber type on sleep quality under warm ambient conditions
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/b6a22521de5d47fab380266255c61ed1
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The impact of sleepwear fiber type on sleep quality under warm ambient conditions

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