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Reliability of accelerometric measurement of physical activity in older adults - the benefit of using the trimmed sum
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4479547
Author(s) Trampisch, Ulrike Sonja; Platen, Petra; Trampisch, Matthias; Moschny, Anna; Thiem, Ulrich; Hinrichs, Timo
Author(s) at UniBasel Hinrichs, Timo
Year 2012
Title Reliability of accelerometric measurement of physical activity in older adults - the benefit of using the trimmed sum
Journal European Review of Aging and Physical Activity
Volume 9
Number 2
Pages / Article-Number 143-148
Abstract There is general consensus that physical activity is important for preserving functional capacities of older adults and positively influencing quality of life. While accelerometry is widely accepted and applied to assess physical activity in studies, several problems with this method remain (e.g., low retest reliability, measurement errors). The aim of this study was to test the intra-instrumental retest reliability of a wrist-worn accelerometer in a 3-day measurement of physical activity in older adults and to compare different estimators. A sample of 123 older adults (76.5 ± 5.1 years, 59 % female) wore a uniaxial accelerometer continuously for 1 week. The data were split into two repeated measurement values (week set) of 3 days each. The sum, the 80-99th quantiles and the 80-99th trimmed sums were built for each week set. Retest reliability was assessed for each estimator and graphically demonstrated by Bland-Altman plots. The intraclass correlation of the retest reliability ranged from 0.22 to 0.91. Retest reliability increases when a more robust estimator than the overall sum is used. Therefore, the trimmed sum can be recommended as a conservative estimate of the physical activity level of older adults.
Publisher BioMed Central
ISSN/ISBN 1813-7253
URL http://www.ncbi.nlm.nih.gov/pmc/articles/pmc3459084/
edoc-URL https://edoc.unibas.ch/64143/
Full Text on edoc No
Digital Object Identifier DOI 10.1007/s11556-012-0100-x
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/23144665
ISI-Number WOS:000309236800007
Document type (ISI) Article
 
   

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