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Effects of filter choice in GT3X accelerometer assessments of free-living activity
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 1634767
Author(s) Wanner, Miriam; Martin, Brian W; Meier, Flurina; Probst-Hensch, Nicole; Kriemler, Susi
Author(s) at UniBasel Kriemler, Susi
Probst Hensch, Nicole
Year 2013
Title Effects of filter choice in GT3X accelerometer assessments of free-living activity
Journal Medicine and science in sports and exercise : official journal of the American College of Sports Medicine
Volume 45
Number 1
Pages / Article-Number 170-7
Abstract PURPOSE: Actigraph accelerometers are widely used devices to objectively assess physical activity. The GT3X version has two filter options to be selected prior to data assessment (normal and low frequency extension filter option). It is not clear whether the resulting physical activity levels differ depending on the choice of the filter. The aims were to compare GT3X data collected using the different filter options during free-living activities and to establish correction factors if the results were not comparable. METHODS: 65 participants of the population-based SAPALDIA-cohort (50.8% women, age range 40-80 years) wore two GT3X accelerometers with different filter selections simultaneously during 8 days. Spearman correlations, Wilcoxon rank sum tests, McNemar tests, scatter plots and Bland Altman plots were used to compare the data. Correction factors were established using linear regression models. RESULTS: Although Spearman correlations were high (r>0.93), there were significant differences in minutes per day between filter options for non-wearing time, and time spent in sedentary, light, and moderate-to-vigorous physical activity (all p<0.001) with more remarkable differences in the lower range of activity (sedentary and light activities). Mean counts/minute and steps per day were significantly higher using the low frequency extension filter (p<0.001). Most differences could be resolved using the correction factors. CONCLUSIONS: The observed differences are especially important when research is focusing on sedentary and light activities. In future studies, it is important to carefully evaluate the suitable filter option and to specify the filter choice in publications. The correction factors can be used to make data assessed using the low frequency extension filter comparable to data assessed using the normal filter option
Publisher Lippincott Williams & Wilkins
ISSN/ISBN 0195-9131
Full Text on edoc No
Digital Object Identifier DOI 10.1249/MSS.0b013e31826c2cf1
PubMed ID
ISI-Number WOS:000312535200025
Document type (ISI) Journal Article

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