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The ActiGraph counts processing and the assessment of vigorous activity.

Journal article
Authors Jan Christian Brønd
Eivind Aadland
Lars Bo Andersen
Geir Kåre Resaland
Sigmund Alfred Andersen
Daniel Arvidsson
Published in Clinical physiology and functional imaging
Volume 39
Issue 4
Pages 276-283
ISSN 1475-097X
Publication year 2019
Published at Department of Food and Nutrition, and Sport Science
Pages 276-283
Language en
Links dx.doi.org/10.1111/cpf.12571
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Public health science, Sport and Fitness Sciences, Nutrition and Dietetics, Signal Processing

Abstract

The purpose of this study was to investigate the effect of different band-pass filters on the measurement bias with ActiGraph counts during high speed running and for estimating free-living vigorous physical activity (VPA). Two alternative band-pass filters were designed, extending the original frequency range from 0·29 to 1·66 Hz (AG) to 0·29-4 Hz (AC4) and 0·29-10 Hz (AC10). Sixty-two subjects in three age groups participated in a structured locomotion protocol consisting of multiple walking and running speeds. The time spent in free-living VPA using the three different band-pass filters were evaluated in 1121 children. Band-pass filter specific intensity cut-points from both linear regression and ROC analysis was identified from a calibration experiment using indirect calorimetry. The ActiGraph GT3X+ device recording raw acceleration at 30 Hz was used in all experiments. The linear association between counts and running speed was negative for AG but positive for AC4 and AC10 across all age groups. The time spent in free-living VPA was similar for all band-pass filters. Considering higher frequency information in the generation of ActiGraph counts with a hip/waist worn device reduces the measurement bias with running above 10 km·h-1 . However, additional developments are required to accurately capture all VPA, including intermittent activities.

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