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Device-captured incidental physical activity, sedentary behaviour and all-cause mortality risk
Nicholas A Koemel1,2,3, Matthew N Ahmadi4,2,3, Raaj Kishore Biswas4,2,3
1Mackenzie Wearables Research Hub, Charles Perkins Centre, Faculty of Medicine and Health, The University of Sydney, Sydney, New South Wales, Australia nicholas.koemel@sydney.edu.au.
Journal of Epidemiology and Community Health
|June 9, 2025
Summary
Incidental physical activity, even in short bursts, can reduce mortality risk associated with prolonged sedentary behavior. This approach offers a feasible way to improve health for those unable to do structured exercise.
Area of Science:
- Public Health
- Epidemiology
- Physical Activity Research
Background:
- Traditional structured exercise may not be feasible for all adults.
- Incidental physical activity from daily living presents a potential alternative for health improvement.
- The study investigates if incidental activity can mitigate mortality risks linked to sedentary behavior.
Purpose of the Study:
- To determine if incidental physical activity can offset the all-cause mortality risk associated with high sedentary behavior.
- To analyze the joint associations of sedentary behavior with various forms of incidental physical activity.
Main Methods:
- Utilized accelerometry data from 25,526 UK Biobank participants.
- Examined associations between sedentary behavior tertiles and incidental vigorous physical activity (VPA), moderate-to-vigorous physical activity (MVPA), vigorous intermittent lifestyle physical activity (VILPA), and moderate-to-vigorous intermittent lifestyle physical activity (MV-ILPA).
- Assessed all-cause mortality risk over a median 8.0-year follow-up period.
Main Results:
- High levels of incidental VPA and MVPA did not show a significant association with reduced mortality risk when sedentary behavior was high.
- VIGOROUS intermittent lifestyle physical activity (VILPA) and moderate-to-vigorous intermittent lifestyle physical activity (MV-ILPA), even in brief bouts, demonstrated a potential to offset mortality risk associated with sedentary behavior.
- A daily duration of 3.4 minutes of VILPA or 25.2 minutes of MV-ILPA was found to offset the mortality risk linked to sedentary behavior.
Conclusions:
- Incidental vigorous physical activity (VPA) and moderate-to-vigorous physical activity (MVPA), when accumulated in brief, intermittent bursts, can effectively offset the all-cause mortality risk associated with high sedentary behavior.
- This highlights the health benefits of integrating short bursts of physical activity into daily routines as a viable strategy for sedentary individuals.
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