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. 2014 Mar 14;52(3):225–234. doi: 10.2486/indhealth.2013-0188

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©2014 National Institute of Occupational Safety and Health

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License.

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Fig. 1. — A) Trapezius muscle rest time (rest time), B) 10th percentile (EMG10), C) 50th percentile (EMG50) and D) 90th percentile (EMG90) of trapezius muscle activity during day and night shift in Swiss and Japanese nurses. These electromyography (EMG) parameters are plotted as day shift vs. night shift. Percentiles of EMG were expressed relative to reference voluntary electrical activation (RVE). Single data points of Swiss nurses are marked with a cross (×) and the regression line of Swiss nurses is shown as a dashed line. Single data points of Japanese nurses are marked with a dot (•) and the regression line of Japanese nurses is shown as a solid line. n_Japan=22, n_Switzerland=17.