Nicoletti Corinne, Läubli Thomas
Department of Health Sciences and Technology, ETH Zurich, Switzerland.
Ind Health. 2017 Apr 7;55(2):162-172. doi: 10.2486/indhealth.2016-0189. Epub 2017 Jan 13.
The aim of this study was to analyze the activity of the trapezius muscle and the arm acceleration during the course of a workday in office employees. It was examined if there are significant changes in trapezius muscle activity in the afternoon compared to the morning work period and relationships to the level of arm acceleration during lunchtime. Nineteen female office employees were recruited. A one hour period of the work in the morning, afternoon, and lunchtime were compared. The measures of the trapezius muscle activity and muscle rest time (TR) did not significantly differ between working in the morning (TR: median 10%; range 1%-49) or working in the afternoon (TR: median 18%; range 2%-34%). The 90 percentile of arm acceleration during lunch time significantly correlated with less trapezius muscle activity in the afternoon compared to the morning values (RT: Spearman R=0.80; p<0.01). Differences in the duration and level of trapezius muscle activity were bigger between the subjects than between different work periods or between lunchtime and work. Furthermore it seems that higher arm accelerations during lunch may be beneficial in reducing trapezius activity in the afternoon compared to the morning values.
本研究旨在分析办公室职员工作日期间斜方肌的活动情况以及手臂加速度。研究考察了与上午工作时段相比，下午斜方肌活动是否有显著变化，以及午餐时间与手臂加速度水平之间的关系。招募了19名女性办公室职员。对上午、下午和午餐时间各一小时的工作情况进行了比较。上午工作（TR：中位数10%；范围1%-49%）和下午工作（TR：中位数18%；范围2%-34%）期间，斜方肌活动和肌肉休息时间（TR）的测量结果没有显著差异。与上午的值相比，午餐时间手臂加速度的第90百分位数与下午斜方肌活动减少显著相关（RT：Spearman相关系数R = 0.80；p<0.01）。不同受试者之间斜方肌活动的持续时间和水平差异，比不同工作时段之间或午餐时间与工作时间之间的差异更大。此外，与上午的值相比，午餐期间较高的手臂加速度似乎有利于降低下午的斜方肌活动。
