| Few instruments that measure physical activity (PA) can accurately quantify PA performed at both light and moderate intensities, which is particularly relevant in older adults. Evidence of their reliability and responsiveness to change is limited. The purposes of this study were to: 1) determine test-retest reliability of the Actigraph (ACT), SenseWear Armband (SWA) and the Community Healthy Activities Model Program for Seniors (CHAMPS) questionnaire in assessing free-living PA; and 2) determine the responsiveness to change in PA measured by the three instruments after an exercise program in individuals with knee osteoarthritis who underwent total knee arthroplasty (TKA). (Abstract shortened by ProQuest.). |
