![]() The upper limb activity of twenty unilateral upper limb myoelectric prosthesis users and twenty anatomically intact adults were recorded over a 7-day period using two wrist worn accelerometers (Actigraph, LLC). However, none of the devices we evaluated was clearly superior or inferior to the rest rather, each device seems to have use cases in which that device excels beyond the others. We decided that the ActiGraph wGT3X-BT is the most appropriate device for inclusion in the Healthy Brain Network. We then acquired physical instances of 5 of these devices (ActiGraph wGT3X-BT, Empatica Embrace, Empatica E4, GENEActiv Original, and Wavelet Wristband) and wore each of them in our daily lives, annotating our activities and evaluating the reasonableness of the data from each device and the logistical affordances of each device. In order to include an ecological biotracker in the Healthy Brain Network protocol, we first evaluated the specifications of a variety of actimeters available for purchase. For many of these devices, accelerometry provides the basis of measuring both physical activity and sleep with comparable derivative measures. Currently a wide range of personal activity trackers are commercially available, providing a wide variety of sensor configurations. The GENEA is a reliable and valid measurement tool capable of classifying the intensity of physical activity in adults.The Healthy Brain Network is an openly shared pediatric psychiatric biobank with a target of 10,000 participants between the ages of 5 and 21, inclusively In adding ecological actimetry to the Healthy Brain Network, we intend to use appropriate, accurate, reliable tools. The accuracy of the waist-worn GENEA was virtually identical with that of the ActiGraph (AUC = 0.94) and RT3 (AUC = 0.95). The waist-worn GENEA had the greatest classification accuracy (area under the receiver operating characteristic curve (AUC) = 0.95), followed by the left (AUC = 0.93) and then the right wrist (AUC = 0.90). ![]() ![]() The GENEA demonstrated excellent concurrent validity compared with the ActiGraph (r = 0.92) and the RT3 (r = 0.97). 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 technical reliability (CVintra = 1.4%, CVinter = 2.1%) and validity (r = 0.98, P < 0.001) using the mechanical shaker. Analyses involved the use of Pearson correlations to establish criterion and concurrent validity and receiver operating characteristic curves to establish intensity cut points. A portable metabolic gas analyzer provided the criterion measure of physical activity. 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. Reliability was calculated using SD and intrainstrument and interinstrument coefficients of variation, whereas validity was assessed using Pearson correlation with the shaker acceleration as the criterion. 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 and light-, moderate-, and vigorous-intensity physical activity and 3) to compare the intensity classification of the GENEA with two widely used accelerometers.Ī total of 47 GENEA accelerometers were attached to a shaker and vertically accelerated, generating 15 conditions of varying acceleration and/or frequency.
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