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|Title:||Accelerometer wear-site detection: When one site does not suit all, all of the time|
|Authors:||Rowlands, Alex V.|
Olds, Tim S.
Stanley, Rebecca M.
Eston, Roger G.
|Citation:||Journal of Science and Medicine in Sport, 2016, doi:10.1016/j.jsams.2016.04.013|
|Abstract:||Objectives: Choice of accelerometer wear-site may facilitate greater compliance in research studies. We aimed to test whether a simple method could automatically discriminate whether an accelerometer was worn on the hip or wrist from free-living data. Design: Cross-sectional. Methods: Twenty-two 10-12 y old children wore a GENEActiv at the wrist and at the hip for 7-days. The angle between the forearm and the total acceleration vector for the wrist-worn monitor and between the pelvis and the total acceleration vector for the hip-worn monitor (i.e. the angle between the Y-axis component of the acceleration and the total acceleration vector) was calculated for each 5 s epoch. The standard deviation of this angle (SDangle) was calculated over time for the wrist-worn and hip-worn monitor for windows of varying lengths. We hypothesised that the wrist angle would be more variable than the hip angle. Results: Wear site could be discriminated based on SDangle; the shorter the time window the lower the optimal threshold and area under the receiver-operating-characteristic curve (AUROC) for discrimination of wear-site (AUROC = 0.833 (1 min) - 0.952 (12 h)). Classification accuracy was good for windows of 8 min (sensitivity = 90%, specificity = 87%, AUROC = 0.92) and plateaued for windows of ≥60 min (sensitivity and specificity >90%, AUROC = 0.95-0.96). Conclusions: We have presented a robust, computationally simple method that detects whether an accelerometer is being worn on the hip or wrist from 8-60 minutes of data. This facilitates the use of wear-site specific algorithms to analyse accelerometer data.|
|Rights:||Copyright © the authors, 2016. This article is distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.|
|Description:||Following the 12 month embargo period the above license applies.|
|Appears in Collections:||Published Articles, College of Medicine, Biological Sciences and Psychology|
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