Methodological considerations in using accelerometers to assess habitual physical activity in children aged 0-5 years
ABSTRACT This paper reviews the evidence behind the methodological decisions accelerometer users make when assessing habitual physical activity in children aged 0-5 years. The purpose of the review is to outline an evidence-guided protocol for using accelerometry in young children and to identify gaps in the evidence base where further investigation is required. Studies evaluating accelerometry methodologies in young children were reviewed in two age groups (0-2 years and 3-5 years) to examine: (i) which accelerometer should be used, (ii) where the accelerometer should be placed, (iii) which epoch should be used, (iv) how many days of monitoring are required, (v) how many minutes of monitoring per day are required, (vi) how data should be reduced, (vii) which cut-point definitions for identifying activity intensity should be used, and (viii) which physical activity outcomes should be reported and how. Critique of the available evidence provided a basis for the development of a recommended users protocol in 3-5-year olds, although several issues require further research. Because of the absence of methodological studies in children under 3 years, a protocol for the use of accelerometers in this age range could not be specified. Formative studies examining the utility, feasibility and validity of accelerometer-based physical activity assessments are required in children under 3 years of age. Recommendations for further research are outlined, based on the above findings, which, if undertaken, will enhance the accuracy of accelerometer-based assessments of habitual physical activity in young children.
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ABSTRACT: Abstract Background: The prevalence of thinness has increased among Japanese children. Aim: The purpose of this study was to examine the association between physical activity and body mass index (BMI) among Japanese pre-school children. Subjects and methods: Subjects were 425 4-6-year-old Japanese girls and boys. Their weights were classified as normal, overweight or thin, based on Cole's international cut-offs for BMI. Physical activity was assessed using a triaxial accelerometer (ActivTracer, GMS) for 6 consecutive days. Results: Physical activity in overweight children was comparable to that in normal-weight children after controlling for age and gender. However, thin children spent significantly greater time engaged in low-intensity activities (physical activity ratio < 2) and spent less time engaged in light-intensity physical activity (2 ≤ physical activity ratio < 3) and moderate-to-vigorous physical activity (physical activity ratio ≥ 3) than normal-weight and overweight children, and less time engaged in higher-intensity physical activity (physical activity ratio ≥ 4) than normal-weight children. Moreover, thin children spent significantly less time engaged in locomotive physical activity than normal-weight or overweight children. Conclusion: This study suggests that thinness, rather than excess weight, is associated with decreased light, moderate and high intensity physical activity in Japanese pre-school children.Annals of Human Biology 07/2013; 40(6). DOI:10.3109/03014460.2013.815802 · 1.15 Impact Factor
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ABSTRACT: 2013): Seasonal and daily variation in physical activity among three-year-old Finnish preschool children, Early Child Development and Care, This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings,
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ABSTRACT: We examined frequency of use of 11 physical activity (PA) locations among 539 San Diego children (45.0% males, 41.2% Latinos; mean ± SD age: 6.6 ± 0.7 years) and explored associations between location use, PA and potential correlates. Parents reported child's use (visits/week) of 11 locations. Child PA was assessed by accelerometry (subsample n = 178). The most frequently used locations (mean ± SD times/week) were homes (3.2 ± 2.3) and parks/playground (1.6 ± 1.3). Children used 4.0 ± 2.0 locations in a typical week, and made a total of 12.5 ± 6.8 visits/week to all locations. Latinos used fewer locations regularly (3.6 ± 2.1 vs. 4.3 ± 1.9 locations; p < 0.001) and had fewer visits to all locations (11.4 ± 7.4 vs. 13.2 ± 6.4 visits/week; p = 0.003) than non-Latinos. Accelerometry-assessed vigorous PA (VPA) was positively associated with the number of locations regularly used (ß = 0.04, p = 0.03) and total visits to all locations among Latinos (ß = 0.09, p = 0.005). Parental PA support was positively associated with locations used (ß = 0.64, p < 0.001) and visits to all locations (ß = 2.56, p < 0.001). Children using a greater variety of locations did more VPA. Latinos making more total visits to all locations had higher VPA.Health & Place 07/2011; 17(4):911-9. DOI:10.1016/j.healthplace.2011.04.008 · 2.44 Impact Factor