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Reactivity to Accelerometer Measurement of Children and Adolescents
PURPOSE: Awareness of being monitored can influence participants’ habitual physical activity (PA) behavior. This reactivity effect may threaten the validity of PA assessment. Reports on reactivity when measuring the PA of children and adolescents have been inconsistent. The aim of this study was to...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Lippincott Williams & Wilkins
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4059597/ https://www.ncbi.nlm.nih.gov/pubmed/24219978 http://dx.doi.org/10.1249/MSS.0000000000000215 |
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author | DÖSSEGGER, ALAIN RUCH, NICOLE JIMMY, GERDA BRAUN-FAHRLÄNDER, CHARLOTTE MÄDER, URS HÄNGGI, JOHANNA HOFMANN, HEIDI PUDER, JARDENA J. KRIEMLER, SUSI BRINGOLF-ISLER, BETTINA |
author_facet | DÖSSEGGER, ALAIN RUCH, NICOLE JIMMY, GERDA BRAUN-FAHRLÄNDER, CHARLOTTE MÄDER, URS HÄNGGI, JOHANNA HOFMANN, HEIDI PUDER, JARDENA J. KRIEMLER, SUSI BRINGOLF-ISLER, BETTINA |
author_sort | DÖSSEGGER, ALAIN |
collection | PubMed |
description | PURPOSE: Awareness of being monitored can influence participants’ habitual physical activity (PA) behavior. This reactivity effect may threaten the validity of PA assessment. Reports on reactivity when measuring the PA of children and adolescents have been inconsistent. The aim of this study was to investigate whether PA outcomes measured by accelerometer devices differ from measurement day to measurement day and whether the day of the week and the day on which measurement started influence these differences. METHODS: Accelerometer data (counts per minute [cpm]) of children and adolescents (n = 2081) pooled from eight studies in Switzerland with at least 10 h of daily valid recording were investigated for effects of measurement day, day of the week, and start day using mixed linear regression. RESULTS: The first measurement day was the most active day. Counts per minute were significantly higher than on the second to the sixth day, but not on the seventh day. Differences in the age-adjusted means between the first and consecutive days ranged from 23 to 45 cpm (3.6%–7.1%). In preschoolchildren, the differences almost reached 10%. The start day significantly influenced PA outcome measures. CONCLUSIONS: Reactivity to accelerometer measurement of PA is likely to be present to an extent of approximately 5% on the first day and may introduce a relevant bias to accelerometer-based studies. In preschoolchildren, the effects are larger than those in elementary and secondary schoolchildren. As the day of the week and the start day significantly influence PA estimates, researchers should plan for at least one familiarization day in school-age children and randomly assign start days. |
format | Online Article Text |
id | pubmed-4059597 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Lippincott Williams & Wilkins |
record_format | MEDLINE/PubMed |
spelling | pubmed-40595972014-06-17 Reactivity to Accelerometer Measurement of Children and Adolescents DÖSSEGGER, ALAIN RUCH, NICOLE JIMMY, GERDA BRAUN-FAHRLÄNDER, CHARLOTTE MÄDER, URS HÄNGGI, JOHANNA HOFMANN, HEIDI PUDER, JARDENA J. KRIEMLER, SUSI BRINGOLF-ISLER, BETTINA Med Sci Sports Exerc Epidemiology PURPOSE: Awareness of being monitored can influence participants’ habitual physical activity (PA) behavior. This reactivity effect may threaten the validity of PA assessment. Reports on reactivity when measuring the PA of children and adolescents have been inconsistent. The aim of this study was to investigate whether PA outcomes measured by accelerometer devices differ from measurement day to measurement day and whether the day of the week and the day on which measurement started influence these differences. METHODS: Accelerometer data (counts per minute [cpm]) of children and adolescents (n = 2081) pooled from eight studies in Switzerland with at least 10 h of daily valid recording were investigated for effects of measurement day, day of the week, and start day using mixed linear regression. RESULTS: The first measurement day was the most active day. Counts per minute were significantly higher than on the second to the sixth day, but not on the seventh day. Differences in the age-adjusted means between the first and consecutive days ranged from 23 to 45 cpm (3.6%–7.1%). In preschoolchildren, the differences almost reached 10%. The start day significantly influenced PA outcome measures. CONCLUSIONS: Reactivity to accelerometer measurement of PA is likely to be present to an extent of approximately 5% on the first day and may introduce a relevant bias to accelerometer-based studies. In preschoolchildren, the effects are larger than those in elementary and secondary schoolchildren. As the day of the week and the start day significantly influence PA estimates, researchers should plan for at least one familiarization day in school-age children and randomly assign start days. Lippincott Williams & Wilkins 2014-06 2014-05-16 /pmc/articles/PMC4059597/ /pubmed/24219978 http://dx.doi.org/10.1249/MSS.0000000000000215 Text en Copyright © 2014 by the American College of Sports Medicine http://creativecommons.org/licenses/by-nc-nd/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivitives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially. |
spellingShingle | Epidemiology DÖSSEGGER, ALAIN RUCH, NICOLE JIMMY, GERDA BRAUN-FAHRLÄNDER, CHARLOTTE MÄDER, URS HÄNGGI, JOHANNA HOFMANN, HEIDI PUDER, JARDENA J. KRIEMLER, SUSI BRINGOLF-ISLER, BETTINA Reactivity to Accelerometer Measurement of Children and Adolescents |
title | Reactivity to Accelerometer Measurement of Children and Adolescents |
title_full | Reactivity to Accelerometer Measurement of Children and Adolescents |
title_fullStr | Reactivity to Accelerometer Measurement of Children and Adolescents |
title_full_unstemmed | Reactivity to Accelerometer Measurement of Children and Adolescents |
title_short | Reactivity to Accelerometer Measurement of Children and Adolescents |
title_sort | reactivity to accelerometer measurement of children and adolescents |
topic | Epidemiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4059597/ https://www.ncbi.nlm.nih.gov/pubmed/24219978 http://dx.doi.org/10.1249/MSS.0000000000000215 |
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