Abstract
BackgroundThe isotemporal substitution (IS) approach can be used to assess the effect of replacing one activity with the equal duration of another activity on relevant outcomes. This study examined the associations of objectively assessed sedentary behavior (SB) and physical activity (PA) with health-related quality of life (HRQOL) in older Japanese adults, using the IS approach.MethodsParticipants were 287 older Japanese adults (aged 65–84 years) who wore accelerometers for at least 7 days. We calculated the average daily time spent in SB (≤1.5 METs); light-intensity PA (LPA: > 1.5 to < 3.0 METs); and moderate- to vigorous-intensity PA (MVPA: ≥3.0 METs) per day. HRQOL was assessed using the Medical Outcomes Survey Short Form-8 questionnaire.ResultsThe IS models showed replacing SB or LPA with MVPA to be significantly associated with better physical component summary scores. Replacing SB with MVPA was marginally associated with better mental component summary scores.ConclusionThese findings indicate that replacing SB with the same amount of MVPA may contribute to better physical HRQOL in older adults.
Highlights
The isotemporal substitution (IS) approach can be used to assess the effect of replacing one activity with the equal duration of another activity on relevant outcomes
moderate- to vigorous-intensity physical activity (MVPA) was significantly associated with better physical component summary (PCS) score
No significant association was found for the mental component summary (MCS) score in the single-activity models, but its association with MVPA approached significance (p = 0.09)
Summary
The isotemporal substitution (IS) approach can be used to assess the effect of replacing one activity with the equal duration of another activity on relevant outcomes. This study examined the associations of objectively assessed sedentary behavior (SB) and physical activity (PA) with health-related quality of life (HRQOL) in older Japanese adults, using the IS approach. SB, LPA, and MVPA are all parts of daily life and can be inter-related: increasing one behavior will result in a reduction of Yasunaga et al Health and Quality of Life Outcomes (2018) 16:240 other behaviors, each of which may have impact on HRQOL. Such complementary relationships between behaviors need to be considered when research examines how a particular activity is associated with outcomes such as HRQOL. The potential impact of replacing one behavior with another on older adults’ HRQOL is less well known
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