Objectively Measuring Physical Activity in Early Childhood Using Accelerometers: Are 4 Days Enough?

Abreo, Kathleen; Borkhoff, Cornelia M.; Anderson, Laura N.; Sarker, Hrishov; Maguire, Jonathon L.; Parkin, Patricia C.; Birken, Catherine S.

doi:10.1016/j.jcjd.2015.01.148

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“…Children with at least four valid days of accelerometer wear-time were included in the analysis [ 21 ]. These valid days could have been any combination of both weekdays and weekend days, as we have shown previously that any 2 days of accelerometer monitoring can be used to assess usual physical activity in children under 5 years of age [ 22 ]. A valid day was defined a priori as a minimum of 5 h of wear-time between 8:00 am and 8:00 pm [ 23 ]; however, there were no children in our study with less than 7.86 h wear time within the specified 12 h period.…”

Section: Methodsmentioning

confidence: 99%

Validation of parent-reported physical activity and sedentary time by accelerometry in young children

et al. 2015

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BackgroundIt is unknown if young children’s parent-reported physical activity and sedentary time are correlated with direct measures. The study objectives were to compare parent-reported physical and sedentary activity versus directly measured accelerometer data in early childhood.MethodsFrom 2013 to 2014, 117 healthy children less than 6 years of age were recruited to wear Actical accelerometers for 7 days. Accelerometer data and questionnaires were available on 87 children (74 %). Average daily physical activity was defined as the sum of activity ≥100 counts per minute, and sedentary time as the sum of activity <100 counts per minute during waking hours. Parents reported daily physical activity (unstructured free play in and out of school, and organized activities) and selected sedentary behaviors (screen time, stroller time, time in motor vehicle). Spearman correlation coefficients and Bland–Altman plots were used to assess the validity of parent-reported measures compared to accelerometer data.ResultsTotal physical activity was significantly greater when measured by accelerometer than parent-report; the median difference was 131 min/day (p < 0.001). Parent-reported child physical activity was weak to moderately correlated with directly measured total physical activity (r = 0.39, 95 % CI 0.19, 0.56). The correlations between types of physical activity (unstructured free play in and outside of school/daycare, and organized structured activity) and accelerometer were r = 0.30 (95 % CI 0.09, 0.49); r = 0.42 (95 % CI 0.23, 0.58); r = 0.26 (95 % CI 0.05, 0.46), respectively. There was no correlation between parent-reported and accelerometer-measured total sedentary time in children (r = 0.10, 95 % CI −0.12, 0.33). When the results were stratified by age group (<18, 18–47, and 48–70 months of age) no statistically significant correlations were observed and some inverse associations were observed.ConclusionsThe correlation between parent-report of young children’s physical activity and accelerometer-measured activity was weak to moderate depending on type of activity and age group. Parent-report of children’s sedentary time was not correlated with accelerometer-measured sedentary time. Additional validation studies are needed to determine if parent-reported measures of physical activity and sedentary time are valid among children less than 6 years of age and across these young age groups.Electronic supplementary materialThe online version of this article (doi:10.1186/s13104-015-1648-0) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%