Purpose
Evaluate the reliability and validity of a self-reported moderate-to-vigorous physical activity (MVPA) instrument administered by telephone and Internet.
Methods
The Active Australia Survey (AAS), administered nationally in Australia by telephone (T), was adapted into two forms for Internet self-administration: survey questions only (I-Text) and with videos demonstrating intensity (I-Video). ...
Purpose
This study aimed to test the validity of the Global Physical Activity Questionnaire (GPAQ) against accelerometer data, as feasible, cost-effective instruments are required for the surveillance of physical activity (PA). The questionnaire has been previously assessed in terms of reproducibility and validity however, validation produced poor results and further ...
A calibration study was conducted to determine the threshold counts for two commonly used accelerometers, the ActiGraph and the Actical, to classify activities by intensity in children 5 to 8 years of age. Thirty-three children wore both accelerometers and a COSMED portable metabolic system during 15 min of rest and then performed up ...
A problem exists in applying the kinetic energy equation KE mv2 to estimates of energy expenditure based on activity counts over long epochs. The instantaneous velocity should be obtained over short time periods (on the order of 0.1 second) and squared to obtain the instantaneous kinetic energy. The instantaneous KE is ...
Abstract
This study assessed the ability of four different activity monitors to discriminate changes in treadmill walking velocity. The relationships between walking velocity and bodily movement and between bodily movement and energy expenditure determined by indirect calorimetry (IC-EE or METs) were determined. Twenty-eight subjects walked at 3.2, 4.0, 4.8, 5.6, and 6.4 km/h (0 % grade) ...
Purpose
a) Compare the predictive potential of speed and CSA(hip) (Computer Science Applications accelerometer positioned on the hip) for level terrain walking METs (1 MET = VO2 of 3.5 mL·kg-1·min-1) and energy expenditure (kcal·min-1); b) cross-validate previously published CSA(hip)- and speed-based MET and energy expenditure prediction equations; ...
To analyze the intra- and inter-instrument reliability of the ActiGraph GT3X accelerometer using a vibration table on each orthogonal axis and at five frequencies of motion. Ten GT3X units were subjected to a specific vibration using a motorized vibration table along the vertical, horizontal right-left and horizontal front-back ...
This study compared measures of sleep from an accelerometer worn on the hip to measures obtained from an accelerometer worn on the wrist, the gold standard measure of sleep behavior in community research. The accelerometer worn on the hip provides a measure of total sleep time in 10- to 11-year-old ...
Background
The study aim was to investigate whether it is possible to use the accelerometer of mobile phones as a valid and reliable tool for monitoring the physical activity.
Method
A specific mobile phone application to gather and record time varying acceleration was developed. The accelerometer integrated within two mobile ...
Purpose
This study evaluated the predictive validity of three previously published ActiGraph energy expenditure (EE) prediction equations developed for children and adolescents.
Methods
A total of 45 healthy children and adolescents (mean age: 13.7 +/- 2.6 yr) completed four 5-min activity trials (normal walking, brisk walking, easy running, and fast running) in an ...