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Fairclough et al 2023.pdf (2.17 MB)

Reference values for wrist-worn accelerometer physical activity metrics in England children and adolescents

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journal contribution
posted on 2023-05-03, 15:27 authored by SJ Fairclough, AV Rowlands, B del Pozo Cruz, M Crotti, L Foweather, LEF Graves, L Hurter, O Jones, M MacDonald, DA McCann, C Miller, RJ Noonan, MB Owen, JR Rudd, SL Taylor, R Tyler, LM Boddy

Background

Over the last decade use of raw acceleration metrics to assess physical activity has increased. Metrics such as Euclidean Norm Minus One (ENMO), and Mean Amplitude Deviation (MAD) can be used to generate metrics which describe physical activity volume (average acceleration), intensity distribution (intensity gradient), and intensity of the most active periods (MX metrics) of the day. Presently, relatively little comparative data for these metrics exists in youth. To address this need, this study presents age- and sex-specific reference percentile values in England youth and compares physical activity volume and intensity profiles by age and sex.


Methods

Wrist-worn accelerometer data from 10 studies involving youth aged 5 to 15 y were pooled. Weekday and weekend waking hours were first calculated for youth in school Years (Y) 1&2, Y4&5, Y6&7, and Y8&9 to determine waking hours durations by age-groups and day types. A valid waking hours day was defined as accelerometer wear for ≥ 600 min·d−1 and participants with ≥ 3 valid weekdays and ≥ 1 valid weekend day were included. Mean ENMO- and MAD-generated average acceleration, intensity gradient, and MX metrics were calculated and summarised as weighted week averages. Sex-specific smoothed percentile curves were generated for each metric using Generalized Additive Models for Location Scale and Shape. Linear mixed models examined age and sex differences.


Results

The analytical sample included 1250 participants. Physical activity peaked between ages 6.5–10.5 y, depending on metric. For all metrics the highest activity levels occurred in less active participants (3rd-50th percentile) and girls, 0.5 to 1.5 y earlier than more active peers, and boys, respectively. Irrespective of metric, boys were more active than girls (p < .001) and physical activity was lowest in the Y8&9 group, particularly when compared to the Y1&2 group (p < .001).


Conclusions

Percentile reference values for average acceleration, intensity gradient, and MX metrics have utility in describing age- and sex-specific values for physical activity volume and intensity in youth. There is a need to generate nationally-representative wrist-acceleration population-referenced norms for these metrics to further facilitate health-related physical activity research and promotion.

Funding

Waterloo Foundation (#1669/3509), West Lancashire Sport Partnership, West Lancashire Leisure Trust, Edge Hill University, and Wigan Council

Lifestyle Theme of the Leicester NHR Leicester Biomedical Research Centre and NIHR Applied Research Collaborations East Midlands (ARC-EM)

History

Author affiliation

Diabetes Research Centre, University of Leicester

Version

  • VoR (Version of Record)

Published in

International Journal of Behavioral Nutrition and Physical Activity

Volume

20

Issue

1

Pagination

35

Publisher

Springer Science and Business Media LLC

issn

1479-5868

eissn

1479-5868

Copyright date

2023

Available date

2023-05-03

Spatial coverage

England

Language

eng

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