Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.

<h4>Objectives</h4>Accurate, objective measurement is important for understanding adolescents' physical activity (PA) behaviour. When using accelerometry to objectively measure PA, a decision must be made regarding how frequently data is recorded (i.e., epoch length). The purpose of...

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Autores principales:	Taren Sanders, Dylan P Cliff, Chris Lonsdale
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d19cc63692134f56ab1d3df3ecc1cbdf
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id	oai:doaj.org-article:d19cc63692134f56ab1d3df3ecc1cbdf
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spelling	oai:doaj.org-article:d19cc63692134f56ab1d3df3ecc1cbdf2021-11-18T08:27:28ZMeasuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.1932-620310.1371/journal.pone.0092040https://doaj.org/article/d19cc63692134f56ab1d3df3ecc1cbdf2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24643129/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Objectives</h4>Accurate, objective measurement is important for understanding adolescents' physical activity (PA) behaviour. When using accelerometry to objectively measure PA, a decision must be made regarding how frequently data is recorded (i.e., epoch length). The purpose of this study was to examine i) PA bout length, and ii) the effect of variations in accelerometer epoch length on PA estimates during physical education (PE) and leisure time in adolescent boys.<h4>Design</h4>Cross-sectional study.<h4>Methods</h4>Year 9 boys (N = 133; mean age ±SD = 14.36±0.48 years) wore accelerometers during two PE lessons, and for a period of seven consecutive days. Data were reintegrated from 1s into longer periods of 2, 5, 10, 30, and 60 seconds. ANOVAs were used to test for differences in PA estimates between epochs in leisure time and PE.<h4>Results</h4>The mean length of vigorous PA (VPA) bouts was 3.5±2.0 seconds for PE and 2.5±1.7 seconds for leisure time, and mean length of moderate PA (MPA) bouts was 2.3±0.5 seconds for PE and 2.9±0.5 seconds for leisure time. During PE, estimates of MVPA, MPA, and light PA (LPA) increased as epoch increased from 1 second to 60 seconds, while VPA and sedentary behaviour estimates decreased. During leisure time, estimates of all PA intensities decreased as epoch increased from 1 second to 60 seconds, with the exception of sedentary behaviour, which increased as epoch length increased.<h4>Conclusion</h4>The context in which PA occurs can influence PA bout length measurement and the effect of variations in epoch length on PA estimates. Researchers measuring PA with accelerometry should be conscious of the possible influence of context on PA estimates.Taren SandersDylan P CliffChris LonsdalePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 3, p e92040 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Taren Sanders Dylan P Cliff Chris Lonsdale Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
description	<h4>Objectives</h4>Accurate, objective measurement is important for understanding adolescents' physical activity (PA) behaviour. When using accelerometry to objectively measure PA, a decision must be made regarding how frequently data is recorded (i.e., epoch length). The purpose of this study was to examine i) PA bout length, and ii) the effect of variations in accelerometer epoch length on PA estimates during physical education (PE) and leisure time in adolescent boys.<h4>Design</h4>Cross-sectional study.<h4>Methods</h4>Year 9 boys (N = 133; mean age ±SD = 14.36±0.48 years) wore accelerometers during two PE lessons, and for a period of seven consecutive days. Data were reintegrated from 1s into longer periods of 2, 5, 10, 30, and 60 seconds. ANOVAs were used to test for differences in PA estimates between epochs in leisure time and PE.<h4>Results</h4>The mean length of vigorous PA (VPA) bouts was 3.5±2.0 seconds for PE and 2.5±1.7 seconds for leisure time, and mean length of moderate PA (MPA) bouts was 2.3±0.5 seconds for PE and 2.9±0.5 seconds for leisure time. During PE, estimates of MVPA, MPA, and light PA (LPA) increased as epoch increased from 1 second to 60 seconds, while VPA and sedentary behaviour estimates decreased. During leisure time, estimates of all PA intensities decreased as epoch increased from 1 second to 60 seconds, with the exception of sedentary behaviour, which increased as epoch length increased.<h4>Conclusion</h4>The context in which PA occurs can influence PA bout length measurement and the effect of variations in epoch length on PA estimates. Researchers measuring PA with accelerometry should be conscious of the possible influence of context on PA estimates.
format	article
author	Taren Sanders Dylan P Cliff Chris Lonsdale
author_facet	Taren Sanders Dylan P Cliff Chris Lonsdale
author_sort	Taren Sanders
title	Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
title_short	Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
title_full	Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
title_fullStr	Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
title_full_unstemmed	Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
title_sort	measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/d19cc63692134f56ab1d3df3ecc1cbdf
work_keys_str_mv	AT tarensanders measuringadolescentboysphysicalactivityboutlengthandtheinfluenceofaccelerometerepochlength AT dylanpcliff measuringadolescentboysphysicalactivityboutlengthandtheinfluenceofaccelerometerepochlength AT chrislonsdale measuringadolescentboysphysicalactivityboutlengthandtheinfluenceofaccelerometerepochlength
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Measuring adolescent boys' physical activity: bout length and the influence of accelerometer epoch length.

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