Each participant was issued an accelerometry-based PA monitor (ActiGraph GT3X or wGT3X-BT, ActiGraph; Pensacola, Florida) collecting data at 30 Hz. ActiGraphs were securely fastened to each participant around the waist at the midaxillary line using an elastic belt and worn for 10 consecutive days [14 (link)–15 (link)]. Offline analysis was performed using ActiLife software (ActiGraph). PA level was quantified as steps/d. Intensity of activity was classified using the Freedson criteria to include percentage of time spent in sedentary, light, moderate, vigorous, and very vigorous activity [16 (link)]. Patients were allowed to use assistive devices (e.g., cane, walker) during PA data collection.
Protocol detail
Accelerometry-Based Physical Activity Monitoring
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Corresponding Organization :
Other organizations : University of Colorado Anschutz Medical Campus, Geriatric Research Education and Clinical Center, VA Eastern Colorado Health Care System
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Variable analysis
independent variables
- Use of assistive devices (e.g., cane, walker) during PA data collection
- Physical activity (PA) level quantified as steps/d
- Intensity of activity classified using the Freedson criteria (percentage of time spent in sedentary, light, moderate, vigorous, and very vigorous activity)
- Accelerometry-based PA monitor (ActiGraph GT3X or wGT3X-BT, ActiGraph; Pensacola, Florida) collecting data at 30 Hz
- Participants wearing the ActiGraph securely fastened around the waist at the midaxillary line using an elastic belt for 10 consecutive days
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