Abstract: In recent years, the “Fitbit” activity monitor has been used in numerous studies on physical activity and to promote lifestyle changes by increasing daily walking. In addition, the Fitbit is frequently used by people in free-living situations to monitor daily step counts. To date, limited studies have examined the ...
Purpose: To assess the criterion validity and responsiveness of the Incidental and Planned Exercise Questionnaire (IPEQ), specifically developed for aging research. Methods: Community-dwelling older adults (n=318, mean age 73.2 years) who participated in a trial investigating the effect of walking program on falls. At baseline a sub-sample (n=177) also wore an ...
Background: The purpose of this study was to determine the responsiveness of two motion sensors to detect change in sedentary behaviour (SB) and physical activity (PA) during an occupational intervention to reduce sitting time. Methods: SB and PA were assessed using a hip-worn Actigraph GTX3 (AG) and a thigh-worn activPAL (...
Introduction: To establish the variability in the measurement of habitual physical activity (HPA) using the ActiGraph(R) GT3X+ accelerometer in children with cerebral palsy (CP). Method: Repeated measures: Independently ambulant children with unilateral CP (n=30; aged 11y3m [2y4m]) completed standardized tasks over two consecutive days wearing an ...
Abstract: The ActiGraph accelerometer is commonly used to measure physical activity in children. Count cut-off points are needed when using accelerometer data to determine the time a person spent in moderate or vigorous physical activity. For the GT3X accelerometer no cut-off points for young children have been published yet. ...
Background: Many studies used the older ActiGraph (7164) for physical activity measurement, but this model has been replaced with newer ones (e.g., GT3X+). The assumption that new generation models are more accurate has been questioned, especially for measuring lower intensity levels. The low-frequency extension (LFE) increases the low-intensity sensitivity ...
Abstract: The aims of this study were: to compare energy expenditure (EE) estimated from the existing GT3X accelerometer equations and EE measured with indirect calorimetry; to define new equations for EE estimation with the GT3X in youth, adults and older people; and to define GT3X vector magnitude (...
Purpose: The study aims were to compare raw tri-axial accelerometer output from ActiGraph GT3X + (AG) and GENEActiv (GA) placed on the hip and the wrist and to develop regression equations for estimating energy expenditure. Methods: Thirty children (7-11 yr.) and 30 adults (18-65 yr.) completed eight activities (ranging from lying ...
Abstract: We explored using the ActiGraph accelerometer to differentiate activity levels between participants in a physical activity (PA, n=54) or `successful aging' (SA) program (n = 52). The relationship between a PA questionnaire for older adults (CHAMPS) and accelerometry variables was also determined. Individualized accelerometry count thresholds (THRESHIND) measured during a 400-m ...
Abstract: Accelerometry has been recognized as a method of objectively measuring community ambulation in persons with multiple sclerosis (MS). However, the assumption that walking itself serves as a major contributor to the accelerometer signal has yet to be tested. This study examined the assumption that community-based walking is a primary ...