查看文章

The study aims were: 1) to assess the technical reliability and validity of the GENEA using a mechanical shaker, 2) to perform a GENEA value calibration to develop thresholds for sedentary, light, moderate, and vigorous intensity physical activity, and 3) to compare the intensity classification of the GENEA with two widely used accelerometers. 47 GENEAs were attached to a shaker and vertically accelerated generating 15 conditions of varying acceleration and/or frequency. Reliability was calculated using standard deviation and intra-and inter-instrument coefficient of variation, while validity was assessed via Pearson correlation with the shaker acceleration as the criterion. Next, 60 adults wore a GENEA on each wrist and on the waist (alongside an Actigraph and RT3 accelerometer) while completing 10-12 activity tasks. A portable metabolic gas analyzer provided the criterion measure of physical activity. Analyses involved the use of Pearson correlations to establish criterion and concurrent validity and ROC curves to establish intensity cut points. The GENEA demonstrated excellent technical reliability (CVintra= 1.4% CVinter= 2.1%) and validity (r= 0.98; p< 0.001) using the mechanical shaker. The GENEA demonstrated excellent criterion validity using VO2 as the criterion (left wrist r= 0.86; right wrist r= 0.83; waist r= 0.87), on par with the waist-worn Actigraph and RT3. The GENEA demonstrated excellent concurrent validity compared to the Actigraph (r= 0.92) and the RT3 (r= 0.97). The waist-worn GENEA had the greatest classification accuracy (Area Under the ROC curve; AUC= 0.95), followed by the left (0.93) then right …