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Validity of smartphones and activity trackers to measure steps in a free-living setting over three consecutive days.
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4614339
Author(s) Höchsmann, Christoph; Knaier, Raphael; Infanger, Denis; Schmidt-Trucksäss, Arno
Author(s) at UniBasel Schmidt-Trucksäss, Arno
Year 2020
Title Validity of smartphones and activity trackers to measure steps in a free-living setting over three consecutive days.
Journal Physiological measurement
Volume 41
Number 1
Pages / Article-Number 015001
Mesh terms Actigraphy, instrumentation, statistics & numerical data; Activities of Daily Living; Adult; Female; Fitness Trackers, statistics & numerical data; Humans; Male; Smartphone, statistics & numerical data; Young Adult
Abstract

This study assessed the validity of a consumer activity wristband, a smartphone, and a research-grade accelerometer to measure steps in a free-living setting.; Thirty healthy adults were equipped with two Garmin Vivofit (non-dominant wrist), one iPhone SE (right pants pocket), three ActiGraph wGT3X  +  (two on the hip, one on the non-dominant wrist), and one StepWatch (right ankle) and instructed to wear the devices continuously during a 3 d monitoring period. All activities of daily living were recorded in 15 min intervals in a diary. The StepWatch served as the criterion method and validity was evaluated by comparing each device with the criterion measure using mean absolute percentage errors (MAPE).; The MAPE for the total step count during the 3 d monitoring period was high with a general underestimation of steps by all devices of  >20% compared to the criterion measure. The wrist-worn ActiGraph markedly overestimated steps during predominantly low active (public transport or driving, and standing) or even inactive (sitting and lying) activities of daily living.; The overall high MAPE of the devices compared to the StepWatch during step-based activities, likely caused by inaccuracies during short and intermittent bouts of activity, may limit their validity in a free-living setting.

ISSN/ISBN 1361-6579
Full Text on edoc
Digital Object Identifier DOI 10.1088/1361-6579/ab635f
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/31851949
   

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