Effects of replacing sedentary behavior with different intensities of physical activity on physical function among community-dwelling elderly: A cross-sectional study
ISPAH ePoster Library. Tajima T. Oct 15, 2018; 225571; 446
Mr. Takayuki Tajima
Mr. Takayuki Tajima
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Abstract Introduction The Japanese official physical activity (PA) guidelines (“Active Guide”) recommend adding 10 minutes of PA per day through its main message “+10.” This study used an isotemporal substitution (IS) model to investigate the effects of replacing sedentary behavior (SB) with 10 minutes of PA categories per day on elderly people’s physical function (PF). Methods Participants were 131 people aged 60-88 years (61.8% female) from the community-dwelling elderly group in Fujisawa, Japan. We used a triaxial accelerometer to assess the duration of SB (≤1.5 METs); light-intensity PA (LPA: >1.5 to <3.0 METs); and moderate-to-vigorous intensity PA (MVPA: ≥3.0 METs). The 30-second chair stand (CS-30) test and the maximal double step length (MDSL) test were used to examine PF. We used multiple linear regression models to assess the correlations between SB, LPA, and MVPA with every two measures of PF. The IS model assessed the effects of replacing 10 minutes per day of SB time with LPA and MVPA.Results SB, LPA, and MVPA was 496.1 (111.8), 341.7 (91.8), and 47.4 (29.9) min/day, mean (SD), on average, respectively. In the IS model, replacing SB with LPA or MVPA showed significant positive correlations with the scores of the CS-30 test (LPA, β=0.228, 95% confidence interval (CI): 0.092, 0.364; MVPA, β=0.634, 95% CI: 0.267, 1.001) and the MDSL test (LPA, β=0.747, 95% CI: 0.063, 1.430; MVPA, β=2.312, 95% CI: 0.464, 4.160).Conclusion These findings suggested that replacing 10 minutes of SB time with LPA or MVPA would significantly affect elderly people’s PF. External funding details This study was partly supported by JSPS KAKENHI Grant Numbers JP17H06151, and Keio Gijuku Academic Development Funds
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