Treating chronic knee pain with acupuncture.

burned.Underlyingdifferences indeviceaccuracymaybecompounded in these measures. Ourstudyis limitedbybeingconductedwithyoung,healthy volunteers inacontrolled settingwithaconvenience sampleof a small number of applications and devices. Results should be confirmed in other settings andwith other devices. Increased physical activity facilitated by these devices could lead to clinical benefits not realized by low adoption of pedometers.Our findingsmayhelp reinforce individuals’ trust inusingsmartphoneapplicationsandwearabledevices to track healthbehaviors,whichcouldhave important implications for strategies to improve population health.