Validity and Reliability of the Wristband Activity Monitor in Free-living Children Aged 10-17 Years
- Author:
Xi YANG
1
;
Russell JAGO
;
Qian ZHANG
;
Ying Yu WANG
;
Jian ZHANG
;
Hua Wen ZHAO
Author Information
- Keywords: Physical activity; Measurement; Children; Wristband activity monitor
- From: Biomedical and Environmental Sciences 2019;32(11):812-822
- CountryChina
- Language:Chinese
- Abstract: Objective In this study we aimed to examine the reliability and validity of the wristband activity monitor against the accelerometer for children.Methods A total of 99 children (mean age =13.0 ± 2.5 y) wore the two monitors in a free-living context for 7 days.Reliability was measured by intraclass correlation to evaluate consistency over time.Repeated-measures analyses of variance was used to detect differences across days.Spearman's correlation coefficient (rho),median of absolute percentage error,and Bland-Altman analyses were performed to assess the validity of the wristband against the ActiGraph accelerometer.The optimal number of repeated measures for the wristband was calculated by using the Spearman-Brown prophecy formula.Results The wristband had high reliability for all variables,although physical activity data were different across 7 days.A strong correlation for steps (rho:0.72,P ＜ 0.001),and moderate correlations for time spent on total physical activity (rho:0.63,P ＜ 0.001) and physical activity energy expenditure (rho:0.57,P ＜ 0.001) were observed between the wristband and the accelerometer.For different intensities of physical activity,weak to moderate correlations were found (rho:0.38 to 0.55,P ＜ 0.001).Conclusion The wristband activity monitor seems to be reliable and valid for measurement of overall children's physical activity,providing a feasible objective method of physical activity surveillance in children.
