Related Experiment Video
Updated: Aug 5, 2026
07:24
A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
Published on: April 21, 2017
Time- vs. Step-Based Physical Activity Metrics for Disability Incidence in Older Adults
Gerontology
|July 29, 2026
Summary
Step counts and moderate-to-vigorous physical activity (MVPA) similarly predict disability in older adults. This study supports using daily step counts as a valuable measure of physical activity for this population.
Area of Science:
- Gerontology
- Public Health
- Epidemiology
Background:
- Established health benefits of moderate-to-vigorous physical activity (MVPA).
- Limited evidence on step counts as a physical activity metric.
- Need to compare MVPA and step counts for predicting disability in older adults.
Purpose of the Study:
- To compare the predictive ability of MVPA and step counts for incident disability.
- To assess physical activity measures in community-dwelling older adults.
Main Methods:
- Prospective cohort study of 8664 older adults.
- Accelerometer-measured MVPA and step counts.
- 60-month assessment of disability incidence and mortality.
- Inverse probability weighting adjusted ROC curve analysis.
Main Results:
- 15.8% developed incident disability within 60 months.
- MVPA AUC: 0.572 (95% CI, 0.542-0.603).
- Step counts AUC: 0.565 (95% CI, 0.537-0.596).
- Comparable predictive performance between MVPA and step counts.
Conclusions:
- Step counts and MVPA demonstrate similar predictive value for incident disability in older adults.
- Findings support the use of step counts as a valid physical activity measure.
- Physical activity monitoring via step counts is feasible for older populations.
