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Sedentary Behavior, Physical Activity, and Bone Health in Postmenopausal Women
Journal of Aging and Physical Activity
|September 14, 2016
Summary
Frequent breaks in sedentary behavior are linked to better bone health in postmenopausal women. Objective activity data can predict bone density at the femoral neck, but not the lumbar spine.
Area of Science:
- Gerontology
- Bone Health
- Physical Activity Measurement
Background:
- Postmenopausal women are at increased risk for osteoporosis.
- Bone health is influenced by lifestyle factors, including physical activity and sedentary behavior.
- Objective measurement of physical activity provides reliable data for health research.
Purpose of the Study:
- To investigate the relationship between objectively measured sedentary behavior and physical activity with bone health in postmenopausal women.
- To determine if bone mineral density at the femoral neck and lumbar spine can be predicted by activity levels.
- To assess the predictive value of sedentary time and breaks in sedentary behavior on osteopenia/osteoporosis risk.
Main Methods:
- 44 postmenopausal women participated in the study.
- Waist-mounted ActiGraph devices (GT1M, GT3X) objectively measured sedentary behavior and physical activity for 7 days.
- Bone health was assessed using dual-energy x-ray absorptiometry (DXA) to determine T scores for the femoral neck (FN) and lumbar spine (LS).
Main Results:
- Sedentary time and the number of breaks in sedentary behavior significantly predicted osteopenia/osteoporosis at the femoral neck.
- These sedentary behavior metrics did not predict bone health at the lumbar spine.
- Adherence to physical activity guidelines was not a significant predictor of bone health at either site.
Conclusions:
- More frequent interruptions in sedentary behavior are associated with improved bone health at the femoral neck in postmenopausal women.
- Objective measures of sedentary behavior, particularly breaks therein, may serve as useful indicators for femoral neck bone health.
- Further research is needed to understand the specific mechanisms linking sedentary behavior patterns to bone density in this population.
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