Accelerometer measured daily physical activity and sedentary pursuits–comparison between two models of the Actigraph and the importance of data reductionReport as inadecuate




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BMC Research Notes

, 6:439

First Online: 31 October 2013Received: 22 March 2013Accepted: 29 October 2013DOI: 10.1186-1756-0500-6-439

Cite this article as: Tanha, T., Tornberg, Å., Dencker, M. et al. BMC Res Notes 2013 6: 439. doi:10.1186-1756-0500-6-439

Abstract

BackgroundVery few validation studies have been performed between different generations of the commonly used Actigraph accelerometers. We compared daily physical activity data generated from the old generation Actigraph model 7164 with the new generation Actigraph GT1M accelerometer in 15 young females for eight consecutive days. We also investigated if different wear time thresholds had any impact on the findings. Minutes per day of moderate and vigorous physical activity MVPA, vigorous physical activity VPA and very vigorous physical activity VVPA were calculated. Moreover, minutes of sedentary pursuits per day were calculated.

FindingsThere were significant P < 0.05 differences between the Actigraph 7164 and the GT1M concerning MVPA 61 ± 21vs. 56 ± 23 min-day, VPA 12 ± 8 vs. 9 ± 3 min-day and VVPA 3.2 ± 3.0 vs. 0.3 ± 1.1 min-day. The different wear time thresholds had little impact on minutes per day in different intensities. Median minutes of sedentary pursuits per day ranged from 159 to 438 minutes depending on which wear time threshold was used i.e. 10, 30 or 60 minutes, whereas very small differences were observed between the two different models.

ConclusionsData from the old generation Actigraph 7164 and the new generation Actigraph GT1M accelerometers differ, where the Actigraph GT1M generates lower minutes spent in free living physical activity. Median minutes of sedentary pursuits per day are highly dependent on which wear time threshold that is used, and not by accelerometer model.

KeywordsAccelerometers Accelerometry Validation study Actigraph  Download fulltext PDF



Author: Tina Tanha - Åsa Tornberg - Magnus Dencker - Per Wollmer

Source: https://link.springer.com/







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