This study examined whether sleep duration and physical inactivity were associated with incident disability among community-dwelling older adults.
Methods
A total of 4,372 adults aged ≥70 years participated in a baseline assessment. We assessed self-reported sleep duration and physical activity using the International Physical Activity Questionnaire – Short Form. We measured monthly incident disability over 5 years.
Results
The Cox proportional hazards regression analysis showed long sleep duration (≥9 h, HR 1.32, 95% CI 1.05–1.67) and physical inactivity (HR 1.33, 95% CI 1.13–1.57) were associated with incident disability in multivariate analyses. Coexistence of long sleep duration and physical inactivity had higher risk of incident disability than each factor individually (HR 1.69, 95% CI 1.11–2.58), even though the synergistic interaction was mildly effective.
Discussion
This study demonstrated that long sleep duration and physical inactivity were independently associated with the risk of incident disability among older adults.
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