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Objectively measured sedentary time and its association with physical function in older adults
Mark G Davis1, Kenneth R Fox, Afroditi Stathi
1Exercise, Nutrition and Health Sciences Department, School for Policy Studies, University of Bristol, Bristol, UK.
Journal of Aging and Physical Activity
|October 3, 2013
Summary
Regular breaks from sedentary time (ST) significantly improve lower extremity function (LEF) in older adults. Increasing breaks may enhance mobility and independence in later life.
Area of Science:
- Gerontology
- Kinesiology
- Public Health
Background:
- Sedentary time (ST) is prevalent in older adults and linked to functional decline.
- Maintaining lower extremity function (LEF) is crucial for independence in aging populations.
Purpose of the Study:
- To investigate the relationship between objectively measured sedentary time (ST), frequency of breaks in ST, and lower extremity function (LEF) in adults aged 70 years and older.
Main Methods:
- Objective assessment of physical activity (PA) using accelerometry, including moderate-vigorous PA (MVPA), ST, and breaks in ST.
- Evaluation of LEF using the Short Physical Performance Battery (SPPB).
- Statistical analysis including univariate associations and adjusted linear regression models.
Main Results:
- MVPA, ST, and breaks in ST were all significantly associated with LEF.
- Adjusted regression models indicated that MVPA, ST, and breaks explained 41.5% of LEF variance.
- Each additional break per hour was associated with a 0.58 point increase in LEF, with breaks and MVPA showing the strongest independent associations.
Conclusions:
- Regular breaks from sedentary time, alongside moderate-vigorous physical activity, are independently associated with better lower extremity function in older adults.
- Promoting frequent breaks from sedentary behavior may be a viable strategy for lifestyle interventions aimed at preserving LEF and independence.
- This study highlights the importance of break frequency, not just overall activity levels, for maintaining physical function in later life.
