![]() This study investigated the associations between breaks in sedentary time, during the day and at different times of the day, and physical function outcomes among older adults. Therefore, investigations of diurnal break patterns in sedentary time and physical function could contribute to the information on the recommended time of day for the projected additional benefits, while designing effective interventions or strategies to maintain and improve muscle function in older adults. The time spent on physical activity can be restricted in the older population more so than in younger groups due to physiological deterioration. However, there are limited studies investigating the diurnal pattern in older adults of the association between breaks in sedentary time and physical function. A recent meta-analysis suggests that increased breaks in sedentary time are associated with increased muscle strength in older adults. Targeting the older population would be a priority, as some evidence shows this age group may spend most of their waking hours in sedentary behavior. Breaking up prolonged sedentary time can provide opportunities to intervene rather than increasing physical activity. Identifying modifiable correlates of physical function may be promising in preventing disability in older adults and reducing the socioeconomic burden.Īn updated global guideline on physical activity and sedentary behavior suggests that reduced sedentary time is independent of preventing a decline in physical function in older people. The impact of disability on older adults places a heavy burden of medical expenses and mental stress on family caregivers. Globally, it is estimated that more than 46% of adults over 60 years of age have disabilities and at least 250 million had moderate to severe disability in 2012. A decline in physical function is considered the main reason for a decline in physical independence and an increased risk of disability. ![]() Aging is associated with some decline in health status. ![]() The number and proportion of the individuals 65 years and older are growing worldwide-the number is expected to more than double from 2019 to 2050, and the proportion is projected to rise from 9% in 2019 to 16% in 2050. Further strategies to interrupt sedentary time with frequent breaks, with an emphasis on evening hours, can be helpful to maintain and improve physical function in older adults. ConclusionĪ break in sedentary time, particularly during the evening, was associated with better lower extremity strength in older adults. Breaks in sedentary time during the day were associated with less time on gait speed in older adults (exp (β) = 0.92, 95% confidence interval 0.86–0.98 p < 0.01). Less frequent breaks in the evening (19.3) were found than that in the morning (24.3) and the afternoon (25.3) ( p < 0.05). Participants showed an average of 69.4 breaks in sedentary time during the day. Generalized linear models were used to examine the associations of the overall and time-specific breaks in sedentary time with the physical function outcomes. Five physical function outcomes were assessed: handgrip strength (dynamometer), balance ability (single leg stance), gait speed (11-m walking), basic functional mobility (time up and go), and lower-limb strength (five times sit-to-stand). A break in sedentary time was defined as at least 1 min where the accelerometer registered ≥100 cpm following a sedentary period. The overall and time-specific breaks (morning: 06:00–12:00 afternoon: 12:00–18:00 evening: 18:00–24:00) in sedentary time were assessed using a triaxial accelerometer (Actigraph GT3X+). MethodsĪ cross-sectional analysis was conducted among 115 older adults (≥60 years). We examined the association of the diurnal pattern of breaks in sedentary time with physical function outcomes in older adults. The association of breaks in sedentary time with outcomes of physical function can vary according to the time of day.
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