Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/27273
Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Peer Review Status: Refereed
Title: Validation of a Novel Device to Measure and Provide Feedback on Sedentary Behavior
Author(s): Gill, Jason M R
Hawari, Nabeha S A
Maxwell, Douglas J
Louden, David
Mourselas, Nikos
Bunn, Christopher
Gray, Cindy M
van der Ploeg, Hidde P
Hunt, Kate
Martin, Anne
Wyke, Sally
Mutrie, Nanette
Keywords: sedentary
sitting
objective measurement
validation
behavior change
Issue Date: 1-Mar-2018
Citation: Gill JMR, Hawari NSA, Maxwell DJ, Louden D, Mourselas N, Bunn C, Gray CM, van der Ploeg HP, Hunt K, Martin A, Wyke S & Mutrie N (2018) Validation of a Novel Device to Measure and Provide Feedback on Sedentary Behavior, Medicine and Science in Sports and Exercise, 50 (3), pp. 525-532. https://doi.org/10.1249/mss.0000000000001458.
Abstract: Purpose Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device—the SitFIT—which could accurately measure and provide feedback on sedentary behavior and physical activity. Methods The SitFIT is a triaxial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, age 30 to 65 yr, with body mass index 26.6 ± 3.9 kg·m−2 wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to 7 d. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide criterion standard measurements of sitting and step counts. Results Mean step counts were approximately 4% lower with the SitFIT than activPAL, with correlation between the two methods being very high (r = 0.98) and no obvious bias from the line of equality (regression line, y = 1.0035x + 418.35). Mean sedentary time was approximately 5% higher with the SitFIT than activPAL, correlation between methods was high (r = 0.84), and the equation of the regression line was close to the line of equality (y = 0.8728x + 38.445). Conclusions The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.
DOI Link: 10.1249/mss.0000000000001458
Rights: © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Sports Medicine. This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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