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Abstract
BackgroundThe purpose of this cross-sectional study was to describe the patterns and levels of sedentary time and physical activity (PA) in a general Japanese population.MethodsA total of 1,740 community-dwelling Japanese adults aged ≥40 years participated in this study. Sedentary time and PA were assessed for 7 consecutive days using a tri-axial accelerometer. Daily patterns and levels of sedentary time and PA were calculated by sex, age group (40–64, 65–74, and ≥75 years), and body mass index (BMI; <25 and ≥25 kg/m2).ResultsParticipants spent half of their waking time being sedentary, 32.7% of which was accumulated in prolonged bouts ≥30 minutes, versus only 54.4 minutes/day (7% of waking time) as moderate-to-vigorous PA (MVPA) (11.8 minutes/day in bouts ≥10 minutes). In addition to total sedentary time, men had longer prolonged sedentary bouts and fewer breaks per sedentary hour than women. Similar trends were observed in participants aged ≥75 years and those with a higher BMI (≥25 kg/m2) compared to those with a younger age and lower BMI. Moreover, participants aged ≥75 years and those with a higher BMI accumulated fewer MVPA minutes in bouts ≥10 minutes. Only 34.8% of the population met the recommended level of ≥150 minutes/week MVPA in bouts ≥10 minutes.ConclusionJapanese adults accumulated a large proportion of total sedentary time in prolonged bouts but few minutes in sustained bouts of MVPA, and few of them met the current PA guideline.
Highlights
The health benefits of moderate-to-vigorous intensity physical activity (MVPA) throughout the life course have been well documented.[1]
Current PA guidelines indicate that MVPA should be accrued in sustained bouts ≥10 minutes for potential health benefits,[1] more research is needed to determine whether MVPA accumulated sporadically has similar health impacts
Sedentary time was negatively correlated with light PA (LPA) (Spearman’s ρ = −0.56, P < 0.0001) and MVPA (Spearman’s ρ = −0.42, P < 0.0001), whereas LPA and MVPA were positively correlated (Spearman’s ρ = 0.34, P < 0.0001)
Summary
The health benefits of moderate-to-vigorous intensity physical activity (MVPA) throughout the life course have been well documented.[1]. Recent experimental studies demonstrated that uninterrupted sedentary time exerted detrimental cardiometabolic effects,[4,5] and data from epidemiologic studies have shown that sedentary time in shorter bouts (eg, more breaks in sedentary time) is associated with a favorable cardiometabolic profile.[6]. The purpose of this cross-sectional study was to describe the patterns and levels of sedentary time and physical activity (PA) in a general Japanese population
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