Gt3x bt accelerometer

PA levels as measured using the ActiGraph GT3X-BT accelerometer. This device assesses body movement on three orthogonal axes and raw data are computed into counts per unit time or “epoch”. We will download and evaluate the raw data in 15-second (s) epochs, since prior research has shown that a 15-s epoch length can reliably capture moderate, vigorous, and sedentary activity in children ages 7-11 years [27 (link)]. Counts per epoch will be used to classify time spent in moderate-to-vigorous activity (MVPA) and sedentary (SED) activity based on standardized, age-appropriate cut-point values [29 (link)].

Following informed consent completion, participants were mailed an assessment packet including an ActiGraph GT3X-BT accelerometer (ActiGraph, Pensacola, Florida) on an elasticized waistband, accelerometer instructions, wear log, and postage-paid return envelope. Participants were emailed a personalized REDCap link to a questionnaire battery. Participants received completion reminders until the accelerometer was returned. The same procedures were followed at 12- and 24-weeks.

After confirmation of eligibility, participants were mailed a study information fact sheet and were scheduled for an initial phone session. During this initial session, a study team member reviewed the details of the study, obtained informed consent, administered all self-report outcome measures, and mailed each participant an Actigraph GT3X-BT accelerometer (Actigraph LLC) to measure baseline physical activity. Participants wore the accelerometer for 1 week and returned it by mail. Once adequate wear time was confirmed (at least 4 days with ≥10 h of wear), participants were mailed a treatment manual and a step counter to monitor physical activity, then attended a second phone session with a study interventionist to initiate the INSPIRED program. Over the next 12 weeks, participants engaged in weekly phone sessions with a study interventionist, then completed PP activities and worked towards health behaviour goals between sessions. At the end of the program, participants completed a final phone session, during which they completed all self-assessment measures and a qualitative exit interview, and they wore an accelerometer for 1 week to measure post-intervention physical activity.