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Updated: Feb 8, 2026

Behavioral and Locomotor Measurements Using an Open Field Activity Monitoring System for Skeletal Muscle Diseases
Published on: September 29, 2014
Reliability of StepWatch Activity Monitor to Measure Locomotor Activity in Youth With Lower Limb Salvage
Saori Braun1, Kristie Bjornson, Erin Dillon-Naftolin
1Department of Kinesiology (Dr Braun), University of Wisconsin-Eau Claire, Eau Claire, Wisconsin; Seattle Children's Research Institute (Dr Bjornson), Seattle, Washington; Department of Psychiatry (Dr Dillon-Naftolin), University of Washington and Seattle Children's Hospital, Seattle, Washington; Northwest Pediatric Gastroenterology (Dr Sheiko), Portland, Oregon; UCLA Geffen School of Medicine (Dr Song), Los Angeles, California; Health, Exercise Science, and Recreation Management (Dr Kang), University of Mississippi, University, Mississippi.
Purpose:
The study purpose was to determine the minimum number of monitoring days necessary to reliably capture walking among individuals with lower limb salvage.
Methods:
Nineteen participants with lower limb salvage wore an ankle-mounted motion sensor over a 7-day period to obtain step counts. Generalizability theory was used to examine the variance components in step counts (G study) and to determine the appropriate length of activity monitoring using various combinations of days (D study).
Results:
Mean step counts were higher on weekends than on weekdays. Fifty percent of the total variance in step counts was accounted for by interindividual variability in walking (D study). Eighty percent was reached individually with 4 weekdays, 2 weekend days, or 3 week days + weekend days.
Conclusion:
The study provides data for an appropriate monitoring method to track walking outcomes of rehabilitation for individuals with lower limb salvage.
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