Is sleep timing related to objectively measured physical activity and sedentary behavior in older women?

Wan Chi Huang, Chia Shuan Chang, Chien Yu Lin, Ting Fu Lai, Ming Chun Hsueh, Yung Liao, Jong Hwan Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Purpose: Sleep, sedentary behavior, and physical activity are the components of the 24-hour model, while the timing of sleep may play a critical role to impact waking behaviors. Therefore, the present study aimed to examine the relationship of sleep timing with sedentary behavior, light-intensity, moderate-to-vigorous-intensity physical activity, and daily steps in older women. Patients and Methods: A total of 90 community-dwelling older women (70.5 ± 5.4 years) were included in our sample. Multiple linear regression models were used to estimate the associations of accelerometer-measured sedentary behavior and physical activity metrics with the three sleep timing indicators (bedtime and wake time, and mid-sleep time). Bedtime and wake time were recorded by the participants, and mid-sleep time was estimated based on the two sleep indicators. Results: Most indicators of sleep timing were negatively associated with moderate-to-vigorous-intensity physical activity (unstandardized coefficient [B]−0.07 for bedtime and mid-sleep time, p<0.05) and daily steps (B ranged from −15.51 for bedtime to −13.73 for wake time, p<0.05). No associations of sleep timing were found in sedentary behavior and light-intensity physical activity. Conclusion: The findings suggest that sleep timing should be considered when designing promising strategies or interventions for older women to be physically active.

Original languageEnglish
Pages (from-to)1377-1381
Number of pages5
JournalNature and Science of Sleep
Publication statusPublished - 2021


  • Aging population
  • Circadian clock
  • Modifiable behavior
  • Sleep timing

ASJC Scopus subject areas

  • Applied Psychology
  • Behavioral Neuroscience


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