There has been no known examination of persons experiencing chronic knee symptoms. Attempts to validate existing consumer-wearable technology (eg, Fitbit) with research-grade monitors (eg, ActiGraph) for agreement in activity time allocated to specific PA intensity levels have yielded mixed results in samples of persons without arthritis 2- 4. The general public's broad interest in tracking personal PA with increasingly advanced wearable technology presents an opportunity to capitalize on personal monitor ownership to estimate PA habits of the arthritis population. In addition, consumer monitors’ biofeedback features hold an appeal for developing interventions to improve PA as well as improving participants’ compliance to the wearable technology, heightening interest in the accuracy of the PA data generated by them. The lower cost and availability of commercial consumer monitors would allow for larger population studies if accuracy is comparable. There is increasing public health interest in the objective measurement of PA in free-living persons with arthritis, but gold standard research-grade wearable monitors, such as the ActiGraph GT3X+, can be prohibitively expensive for large-scale studies. Physical activity (PA) can improve strength and function and decrease pain in persons with arthritis, but among adults with lower-extremity joint conditions, as many as four in five do not attain recommended PA thresholds 1.
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