School-based physical activity and sedentary behaviour were measured using the ActiGraph wGT3X+ accelerometer. Participants wore the accelerometer during school hours for five consecutive days at baseline and post-intervention. We also asked teachers to complete an accelerometer wear diary to record when the devices were put on and taken off for each participant, and to report reasons for the device being removed during the day. The required wear time for the device was four out of the five measurement days for at least 3 h per day (which represents approximately 50% of the school day), and non-wear was classified as 20 min of continues zero counts [23 (link), 24 (link)]. We recorded how many participants met this criteria to assess the feasibility and acceptability of this measure. Sedentary behaviour and physical activity levels were estimated from the raw count data using population-specific cut points [22 (link)].
Wgt3x accelerometer
Manufactured by ActiGraph
Sourced in United States
The ActiGraph wGT3X+ accelerometer is a small, portable device that measures physical activity and sedentary behavior. It records tri-axial acceleration data, which can be used to assess an individual's movement and energy expenditure.
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Lab products found in correlation
6 protocols using wgt3x accelerometer
1
Measuring School-Based Physical Activity
2
Measuring Children's Physical Activity
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Children’s physical activity level was measured with an Actigraph wGT3X accelerometer (Actigraph Corp., Pensacola, FL, United States). Actigraph wGT3X is a lightweight (19 g; 4.6 cm × 3.3 cm × 1.5 cm), triaxial accelerometer, which collects motion data on three orthogonal axes—vertical (Y), horizontal right–left (X), and horizontal front–back axis (Z)—between 0.05 and 2.0 Gs. This accelerometer has been validated for use with children in laboratory and field settings (Santos-Lozano et al., 2012 (link); Delisle et al., 2015 (link); Carson et al., 2019 (link)). Participants wore this equipment using an elastic belt at the waist. The analog acceleration data were converted to a digital signal, and the value (count) was stored in specified time interval (epoch). Ten-second epochs were used for this study. After data collection, the monitor was downloaded to a computer for subsequent data reduction and analysis.
3
Measuring Physical Activity with ActiGraph
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Physical activity was measured using the ActiGraph wGT3X+ accelerometer (ActiGraph, LLC, Pensacola, FL, USA). This small, lightweight device (46 × 33 × 15 mm, 19 g) measures acceleration during movement across the vertical, horizontal, and perpendicular axes. Prior to the session, the accelerometers were initialized to record accelerations at a sampling frequency of 30Hz. Participants wore one device on their right hip at the iliac crest, attached using an elastic belt, for the duration of the activity session.
4
Measuring Preschool Children's Sedentary Time
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Children’s ST was measured using an Actigraph W-GT3X accelerometer (Actigraph, LLC, Fort Walton Beach, Florida). Children wore the accelerometer on their hip 24 h a day for seven days. Actigraph has been validated and used extensively as an objective measure of PA and ST for different age groups and in different contexts [46 (link),47 (link),48 (link)]. After data collection, the epoch length was set at 15 s. Periods of 10 min or more at zero accelerometer counts were considered to be nonwear times and were excluded [49 (link)]. The possible nap-times were not excluded. For the analyses, the Evenson ST cut-point (≤100 counts per min) was applied [50 (link)], having been shown to be a good estimate of free-living ST [51 (link),52 (link)].
For the purposes of this study, only the accelerometer data from the preschool time were used. Parent-provided information about daily preschool hours were applied. We set the following wear-time criteria to be included in the analyses: Children needed to be at the preschool for at least 240 min per day for at least two days. Because preschool hours varied between children, the variable was adjusted for the preschool wearing hours. The measure used in this study indicates, therefore, the children’s ST minutes in one hour in preschool.
For the purposes of this study, only the accelerometer data from the preschool time were used. Parent-provided information about daily preschool hours were applied. We set the following wear-time criteria to be included in the analyses: Children needed to be at the preschool for at least 240 min per day for at least two days. Because preschool hours varied between children, the variable was adjusted for the preschool wearing hours. The measure used in this study indicates, therefore, the children’s ST minutes in one hour in preschool.
5
Adherence and Activity Levels in Active Play
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Adherence was operationalised as attendance at the active play sessions, with all non-attendance recorded as non-adherence, and session MVPA levels. Teachers were asked to record participant attendance at the active play sessions and reasons for non-attendance. The sessions were designed with the aim of children completing at least 30 min (50% of each session) in MVPA. Participants wore an ActiGraph wGT3X+ accelerometer during four sessions to assess whether at least 50% of the session in was spent doing MVPA. The ActiGraph wGT3X+ is a small, lightweight device that been validated for children with intellectual disabilities and was worn around the waist, attached using an elastic belt [22 (link)]. Physical activity was recorded using 5-s epochs, and due to the active nature of the sessions, 5 min of continuous zero counts was used to identify non-wear. MVPA was classified using population-specific cut points [22 (link)].
6
Accelerometer-Measured Physical Activity Guidelines
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PA was measured using an Actigraph wGT3X+ accelerometer. Participants were instructed to wear the device on their right hip for 7 consecutive days. Accelerometry data were analyzed using the Actigraph Actilife program (v6.12). Wear time was validated using the algorithm developed by Choi et al.32 (link) A valid wear day was considered to be 600 minutes of wear time, while a valid week was defined at least 4 valid days within the 7-day period.33 (link),34 (link) The PA cutoffs established by Troiano et al.34 (link) were used to determine time spent in MVPA (≥ 2,020 counts per minute), with only bouts of MVPA lasting at least 10 minutes being included, as per PA guidelines.35 (link) Weekly MVPA was then calculated using the average daily MVPA among valid wear days, multiplied across the 7 days. According to PA guidelines, adults should participate in at least 150 minutes of MVPA per week.35 (link) Thus, the sample was categorized into two levels for descriptive analysis: those who met PA guidelines and those who did not.
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