Preprint / Version 1

Effects of Bedroom Environment on Average Heart Rate During Sleep in Temperate Regions: Summer Conditions in Healthy Males in Their Twenties with Average BMI

##article.authors##

  • Noriaki Oota Yamagata University
  • Yasuki Yamauchi
  • Gota Iwase
  • Yasuhiro Hiraguri
  • Masaru Abuku

DOI:

https://doi.org/10.31224/3851

Keywords:

Average heart rate during sleep, Summer, Bedroom environment, Thermal environment, Field survey

Abstract

The average heart rate at night is an important biomarker and environmental factors in the bedroom may affect the heart rate during sleep. There is limited research on the relationship between average heart rate during sleep and indoor environmental factors. Therefore, this paper presents an experiment designed to identify the environmental factors in the bedroom that affect variations in sleep average heart rate (SHR[1]). Measurements were conducted on three male participants in their usual sleeping environments over two periods: during two summers from July 5 to September 22, 2022; and from August 9 to September 30, 2023. The experimental conditions were kept constant during both periods. The field survey did not impose any specific conditions on participants. Heart rate and body movement were measured along with environmental factors, such as thermal environment, humidity, illuminance, and CO2 concentration. The results demonstrated that the thermal environment had the strongest linear correlation with SHR. In particular, room, radiant, and operative temperatures all showed a significant positive correlation. The average operative temperature and average heart rate over the entire experimental period for each participant showed a significant positive correlation with a coefficient of approximately 0.38. For the bed microclimate temperature was not a mediating variable for operative temperature. No confounding effects between SHR and body movement due to operative temperature were found. On the above, the multilevel structural equation model identified operative temperature and body movement as the variables that best explained SHR. Overall, a greater understanding of how environmental conditions affect sleep heart rate could enable the design of environments that promote a stable heart rate during sleep.

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Posted

2024-08-22