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Cut-point-free accelerometer metrics to assess children's physical activity: an example using the school day

Fairclough, SJ, Rowlands, AV, Taylor, S and Boddy, LM Cut-point-free accelerometer metrics to assess children's physical activity: an example using the school day. Scandinavian Journal of Medicine and Science in Sports. ISSN 0905-7188 (Accepted)

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Abstract

The aims were to (i) investigate associations between a novel accelerometer metric: the minimum acceleration value above which the most active 30-minutes were accumulated during the school day (M30ACC), and health indicators, and (ii) demonstrate that applying an equivalent cut-point to the M30ACC metric gives comparable prevalence results as a moderate-to-vigorous physical activity (MVPA) cut-point approach. Two-hundred-and-ninety-six children (age 9-10-years) wore wrist-mounted accelerometers for 7-days. School day MVPA and M30ACC were calculated. Body mass index (BMI), waist-to-height ratio (WHtR), and cardiorespiratory fitness (CRF) were also measured. Mixed linear models investigated associations between M30ACC and health indicators. Agreement between ranked MVPA and M30ACC values was assessed using percent agreement, kappa, sensitivity, and specificity statistics. M30ACC thresholds associated with health indicators were 213 mg (BMI), 206 mg (WHtR), and 269 mg (CRF) for girls. The equivalent values for boys were 234mg (BMI), 230 mg (WHtR), and 327 mg (CRF). Less than half of girls and 75% of boys accumulated 30 minutes of school day MVPA. Just less than 50% of girls and >80% of boys had M30ACC values ≥200 mg, which is equivalent to brisk walking. Agreement between MVPA and M30ACC tertiles was high, reflected by the sensitivity and specificity values of > 90%. Results demonstrate the utility of M30ACC as a PA metric that is not heavily influenced by researcher decisions. M30ACC has potential as an accelerometer-specific metric for generating PA guidelines related to health indicators, and easily understood forms of activity such as brisk walking.

Item Type: Article
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences
Subjects: L Education > LB Theory and practice of education > LB1501 Primary Education
G Geography. Anthropology. Recreation > GV Recreation Leisure > GV561 Sports
Divisions: Sports & Exercise Sciences
Publisher: Wiley
Date Deposited: 25 Sep 2019 08:48
Last Modified: 25 Sep 2019 08:48
URI: http://researchonline.ljmu.ac.uk/id/eprint/11382

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