Currently submitted to: JMIR mHealth and uHealth
Date Submitted: Jul 2, 2019
Open Peer Review Period: Jul 5, 2019 - Aug 30, 2019
(currently open for review)
Validation of the W@WApp + MetaWearC sensor to monitor occupational sitting, standing and moving in office employees.
Replacing occupational sitting time with active tasks has several proposed health benefits for office employees. Smartphones and motion sensors, can provide objective information in real time on occupational sedentary behaviour (SB) – a key determinant of health. However, the validity and feasibility of using mHealth devices to quantify and modify occupational sedentary time is unclear.
To validate the new Walk@Work-Application (W@WApp) – including an external motion sensor (MetaWearC) attached to the thigh – for measuring occupational sitting, standing and movement in free-living conditions against the activPAL3M as a criterion measure. evices to quantify and modify occupational sedentary time is unclear.
Twenty office-workers (80% female, 39.5±8.1 yrs.) downloaded the W@WApp to their smartphones, wore a MetaWearC attached to their thigh in a tailored band and wore the activPAL3M for three to eight consecutive working hours. Differences between the two measures were examined using the Wilcoxon signed-rank tests. Associations between both measures were determined using the Spearman rank-order correlation coefficients, while agreement between measures were presented using Bland-Altman plots.
The median recording time for the W@WApp+MetaWearC and the activPAL3M were 237.50±132.75 mins. and 240.00±127.50 mins. respectively (P<.001). No significant differences between sitting, standing and movement time were identified. Correlation coefficients identified very strong associations between the two measures for sitting and standing (rho=0.96 and 0.91, P<.001), with strong associations identified for movement (rho=0.74, P<.001). Bland-Altman plots indicated that sitting and standing time were under-reported with a mean bias of -1.66 mins. and -4.85 mins. respectively. For movement time, a positive mean bias of 1.15 mins. was identified.
The W@WApp+MetaWearC is a low-cost, accurate tool that can objectively measure occupational sitting, standing and movement in real-time. Using this tool could positively influence occupational activity behaviours in future interventions.
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