Cross-sectional associations of sedentary behaviour and physical activity on depression in Japanese older adults: An isotemporal substitution approach

Akitomo Yasunaga, Ai Shibata, Kaori Ishii, Mohammad Javad Koohsari, Koichiro Oka

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9 Citations (Scopus)

Abstract

Objectives Reducing sedentary behaviour (SB) and increasing physical activity (PA) have been shown to be associated with decreased depression. However, there are yet few studies examining the potential benefits on older adults' depression, when SB is replaced with PA. This study aimed to examine the associations of objectively assessed SB, light-intensity PA (LPA) and moderate-tovigorous PA (MVPA) with depression among a sample of Japanese older adults, and to explore impacts of substituting SB with PA on older adults' depression. Design Cross-sectional analysis. Setting General community. Participants A total of 276 older adults aged 65-85 years living in Japan. Main outcome measures Three behaviours including the average daily time spent in SB (≤1.5 METs); LPA (>1.5 to <3.0 METs) and MVPA (≥3.0 METs) per day were calculated by accelerometers. Depression was assessed using the Japanese version of the 15-item Geriatric Depression Scale (GDS-15). Results Less SB (β=0.129, 95% CI 0.015 to 0.243) and more LPA (β=-0.138, 95% CI -0.265 to -0.011) were found to be significantly and negatively associated with the GDS-15 score in the single-activity model. The isotemporal substitution model found that replacing only 30 min per day of SB with the same amount of LPA to be significantly and negatively associated with the GDS-15 score (β=-0.131, 95% CI -0.260 to -0.002). Conclusions These findings indicated that substituting even small amounts of SB with LPA may contribute to less depression in older adults. Potential favourable effects can be observed for replacing only 30 min per day of SB with LPA.

Original languageEnglish
Article numbere022282
JournalBMJ open
Volume8
Issue number9
DOIs
Publication statusPublished - 2018 Jan 1

ASJC Scopus subject areas

  • Medicine(all)

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