Aim: To assess the criterion validity of the ActiGraph inclinometer algorithm for detecting sitting and standing postures when worn on the thigh and waist. Methods: Thirty-nine adults (46% female, age: 31.0±8.8 years, BMI: 26.7±5.0 kg/m2) were directly observed whilst participating in a range of sedentary (typing on a computer, watching television, playing ...
Purpose: Impact loading of bone is thought to be an important prevention for osteoporosis throughout life. The purpose of this study was to assess validity of accelerometers that provide raw acceleration signals with ground reaction force (GRF) for daily physical activities in children. Understanding error of these devices is a ...
Aim: The aim of this study was to assess time trends in objectively assessed physical activity in a population based sample of children and adolescents living in Norway. Methods: The sample population (n=4766) consists of two independent samples of 9- and 15-year-old children recruited within the PANCS project in 2005-06 ...
Objective: In order to determine Physical Activity (PA) levels under a health enhancing perspective, Physical activity questionnaires (PAQs) are widely used. Recall ability is a known systematic error in PAQs. The aim of the investigation was to assess the impact of age and type of activity (moderate or vigorous) on ...
Purpose: To compare the Freedson, Crouter and Santos-Lozano (vertical axis [VT] and vector-magnitude [VM]) equations for ActiGraph GT3X+ (AG) with indirect calorimetry for predicting energy expenditure (EE) in older adults in free-living environments. Methods: Forty older adults (age=77.36 yr (SD+8.13; range 66 to 99 years), BMI=25.96 kg∙m-2 (SD=3.67) completed a ...
Background: Physical activity and sedentary behaviour of South African preschool children has not been previously assessed, nor has the impact of socioeconomic status on these behaviours. Methods: Physical activity was measured objectively using Actigraph GT3X+ accelerometers on children 3-6 years old, including children from low income (n=87) and high-income (...
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 ...
Objective: The correction to the prevalence of the physical inactive in a 2009-10 Chilean National Health Survey (NHS) through the use of accelerometers. Methods: Population older than 15 years old were recruited from different educational levels of the urban area of Santiago-Chile, who had answered the GPAQ ítem during 2009-10 NHS. ...
Purpose: There is considerable debate about the possibility of physical activity compensation. This study examined whether increased levels in physical activity and/or sedentary behaviour on one day were predictive of lower levels in these behaviours the following day (compensatory mechanisms) among children. Methods: Two hundred and forty-eight children (121 boys, 127 ...