Madeleine Pascal, Søgaard Karen, Holtermann Andreas, Samani Afshin
Center for Sensory-Motor Interaction, Dept. of Health Science and Technology, Aalborg University, Aalborg, Denmark.
Work. 2012;41 Suppl 1:447-52. doi: 10.3233/WOR-2012-0195-447.
The aim of the present study was to investigate the relation between self-reported pain, muscular activity and postural load during cleaning tasks. Eighteen cleaners performed usual cleaning tasks in both a laboratory and a lecture room. The level of perceived pain in the neck-shoulder region during the last 7 days was recorded. Bipolar surface electromyography (SEMG) was recorded bilaterally from upper trapezius and erector spinae muscles during cleaning. Root mean square (RMS) and permutation entropy (PE) values representing amplitude and complexity of SEMG time-series were estimated. A tri-axial accelerometer package was mounted on the low back (L5-S1) to measure postural changes during cleaning tasks. The 10th, 50th and 90th percentiles of the angular distributions were computed to characterize postures and movements. Pain tended to play a significant role on RMS of left/right trapezius and left erector spinae muscles (P≤0.08). Cleaners with low pain level exhibited higher muscular activity during cleaning. Pain played or tended to play a significant role on PE of left and right erector spinae muscles (P≤0.08). Pain played a significant role on the 10th, 50th and 90th percentile (P<0.05) of lateral flexion angle (side bending). The present study emphasizes biomechanical adaptations occurring in presence of neck-shoulder pain during cleaning tasks.
本研究的目的是调查清洁任务期间自我报告的疼痛、肌肉活动和姿势负荷之间的关系。18名清洁工在实验室和讲堂进行常规清洁任务。记录过去7天中颈肩区域的疼痛感知水平。在清洁过程中，双侧记录上斜方肌和竖脊肌的双极表面肌电图（SEMG）。估计代表SEMG时间序列幅度和复杂性的均方根（RMS）和排列熵（PE）值。在低腰（L5-S1）处安装一个三轴加速度计组件，以测量清洁任务期间的姿势变化。计算角度分布的第10、50和90百分位数，以表征姿势和动作。疼痛往往对左/右斜方肌和左竖脊肌的RMS有显著影响（P≤0.08）。疼痛水平低的清洁工在清洁过程中表现出更高的肌肉活动。疼痛对左右竖脊肌的PE有显著或趋于显著的影响（P≤0.08）。疼痛对侧屈角（侧弯）的第10、50和90百分位数有显著影响（P<0.05）。本研究强调了清洁任务期间颈肩疼痛时发生的生物力学适应。
