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Reactivity to accelerometer measurement of children and adolescents

Dössegger, Alain and Ruch, Nicole and Jimmy, Gerda and Braun-Fahrländer, Charlotte and Mäder, Urs and Hänggi, Johanna and Hofmann, Heidi and Puder, Jardena J. and Kriemler, Susi and Bringolf-Isler, Bettina. (2014) Reactivity to accelerometer measurement of children and adolescents. Medicine and science in sports and exercise : official journal of the American College of Sports Medicine, 46 (6). pp. 1140-1146.

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Official URL: http://edoc.unibas.ch/dok/A6271935

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Abstract

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.; 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.; 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.; 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.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH)
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Former Units within Swiss TPH > Microbial Exposure & Childhood Allergies (Braun-Fahrländer)
UniBasel Contributors:Braun-Fahrländer, Charlotte and Kriemler, Susi
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Lippincott Williams & Wilkins
ISSN:0195-9131
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Jun 2018 12:18
Deposited On:18 Jul 2014 09:10

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