C.M. Veal1, D. Crawford2, J. New1, C.P. Dionne2,S.B. Sisson1; 1Department of Nutritional Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 2Department of Rehabilitation Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK

PURPOSE: To determine convergent validity of physical activity device measurement in adults with unilateral transtibial amputation for step count, time in light physical activity (LPA), time in moderate physical activity (MPA), and classification of physical activity (PA) intensity. METHODS: Adults with unilateral transtibial amputation (n=2) voluntarily participated in this single-visit, lab-based assessment. Exclusion criteria included: cardiovascular disease, hypertension, obesity, stroke, and neuromuscular disorders. The Yamax DigiWalker SW-200 (DW) and ActiGraph GT3x (AG) were worn on the right hip. The SenseWear Armband (SWA) was worn on the right tricep, and the ActivPAL was worn approximately mid-thigh on the right leg. The Intelligent Device for Energy Expenditure and Activity (ID) had five sensors. One sensor was placed between the clavicles, one mid-thigh on each leg, and two parallel to the ground on the top of participants' shoes. The protocol consisted of four counter-balanced phases each lasting 6 minutes: sitting, standing, LPA, and MPA. A two-minute wash out occurred between phases to allow monitors to record zeros and signify a break in phase. The light and moderate activity phases were at a self-selected pace on an indoor, flat, climate-controlled, carpeted hallway.

CONCLUSIONS: Thus far, it appears that as intensity increases, intensity misclassification also increases. For step count, as intensity increases variance also seems to increase. Continued research is needed to determine the most valid devices for basic physical activity assessment.



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