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PHYSICAL ACTIVITY MEASUREMENT VALIDITY OF MOTION SENSOR TECHNOLOGIES IN LABORATORY SETTINGS

Abstract

PHYSICAL ACTIVITY MEASUREMENT VALIDITY OF MOTION SENSOR TECHNOLOGIES IN LABORATORY SETTINGS

K. Taylor, D.R. Paul, A.K. Martin, S.P. Beitey, S.L. Croston, G. Goc Karp, C.A. Vella FACSM, D. Rosslerova, K.J. Young, E.M. Drake, P.W. Scruggs

University of Idaho, Moscow, ID

The Institute of Medicine recommends that physical education (PE) engage students in moderate to vigorous physical activity (MVPA) during class; however, there is a paucity of research on practical physical activity (PA) assessment technologies. Purpose: To examine the agreement between simple and complex PA assessment technologies under controlled indoor and outdoor conditions. Methods: Participants (N = 33, 12.61±1.24yr) wore motion sensors (SW200, W4L MVPa 3D, FitStep Pro, GeoPal, MOVband, NL1000, and GT3X+) while walking and jogging on a treadmill and outdoors. Participants walked and jogged on a treadmill (0% grade, 2 min at speeds of 80a, 107b, 134c, and 161dm/min), and 250m outdoor course (self-selected paces). Criterion and predictor measures were observed steps and walk or jog time, and steps and MVPA time, respectively. Absolute-value percent error scores (APES, [[|criterion - predictor|] / criterion] x 100) were computed for each predictor measure. Mean APES were compared against a ≤ 10% (±95% CI) criterion and analyzed by one-way ANOVA (p≤0.05) and Bonferroni post hoc tests. Results: Treadmill APES for steps were not significantly different across all speeds and were ≤ 10% of criterion (lowest APES, 1.69±0.57%[GeoPal]a, 0.86±0.39%[SW200]b, 0.75±0.46%[SW200]c, 0.69±0.53%[SW200]d), except for the MOVband (p < 0.05, 12.25±3.24d). APES for the outdoor walking (0.82±0.21%[MVPa] to 3.85±1.92%[GeoPal]) and jogging (2.04±2.05%[SW200] to 7.12±2.75%[MVPa]) conditions were similar (p > 0.05) and ≤ 10%, except for MOVband (p < 0.05, 10.74±3.67 to 40.34±4.51%). At all treadmill speeds except 80m/min, APES for MVPA were ≤10% of criterion. The NL1000 had the only APES (2.36±1.29%) ≤ 10% at 80m/min and that was significantly different than all others (p<0.05). At 107 and 134m/min, APES were similar across instruments (p > 0.23) and all APES at 161m/min were similar (p > 0.99), except for MVPa (3.77±2.91%, p < 0.03). Two APES were similar (p > 0.99) and ≤ 10% for the outdoor walk (1.84±1.48%[GT3X+], 6.93±5.00%[NL1000]), and two APES (GeoPals) were > 10% for the outdoor jog and the remaining were similar (p > 0.99, 0.49±0.12[GT3X+] to 5.35±2.21%[MVPa]). Conclusions: Results from this study indicate there are multiple practical PA instruments that can validly measure steps and MVPA.

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