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Sleep Med Rev. 2019 Aug;46:124-135. doi: 10.1016/j.smrv.2019.04.008. Epub 2019 Apr 19.

Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis.

Author information

1
Department of Biomedical Engineering, Cockrell School of Engineering, The University of Texas at Austin, USA. Electronic address: shahab@utexas.edu.
2
Department of Biomedical Engineering, Cockrell School of Engineering, The University of Texas at Austin, USA.
3
Department of Biomedical Engineering, Cockrell School of Engineering, The University of Texas at Austin, USA; Department of Internal Medicine, Division of Pulmonary and Sleep Medicine, McGovern School of Medicine, The University of Texas Health Science Center at Houston, USA.
4
Department of Internal Medicine, Division of Pulmonary and Sleep Medicine, McGovern School of Medicine, The University of Texas Health Science Center at Houston, USA; Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Keck School of Medicine, University of Southern California, Los Angeles, USA.

Abstract

Water-based passive body heating (PBHWB) as a warm shower or bath before bedtime is often recommended as a simple means of improving sleep. We searched PubMed, CINAHL, Cochran, Medline, PsycInfo, and Web of Science databases and extracted pertinent information from publications meeting predefined inclusion and exclusion criteria to explore the effects of PBHWB on sleep onset latency (SOL), wake after sleep onset, total sleep time, sleep efficiency (SE), slow wave sleep, and subjective sleep quality. The search yielded 5322 candidate articles of which 17 satisfied inclusion criteria after removing duplicates, with 13 providing comparable quantitative data for meta-analyses. PBHWB of 40-42.5 °C was associated with both improved self-rated sleep quality and SE, and when scheduled 1-2 h before bedtime for little as 10 min significant shortening of SOL. These findings are consistent with the mechanism of PBHWB effects being the extent of core body temperature decline achieved by increased blood perfusion to the palms and soles that augments the distal-to-proximal skin temperature gradient to enhance body heat dissipation. Nonetheless, additional investigation is required because the findings regarding PBHWB are limited by the relative scarcity of reported research, especially its optimal timing and duration plus exact mechanisms of effects.

KEYWORDS:

Arteriovenous anastomoses; Bath; Circadian rhythm; Core body temperature; Foot bath; Passive body heating; Shower; Skin temperature; Sleep; Sleep onset latency

PMID:
31102877
DOI:
10.1016/j.smrv.2019.04.008

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