Centre for Interdisciplinary Research in Rehabilitation and Social Integration and Laval University, Quebec City, QC G1M2S8, Canada.
Department of Rehabilitation, Laval University, Quebec City, QC G1V0A6, Canada.
Sensors (Basel). 2019 Apr 20;19(8):1885. doi: 10.3390/s19081885.
: Workplace adaptation is the preferred method of intervention to diminish risk factors associated with the development of work-related shoulder disorders. However, the majority of the workplace assessments performed are subjective (e.g., questionnaires). Quantitative assessments are required to support workplace adaptations. The aims of this study are to assess the concurrent validity of inertial measurement units (IMUs; MVN, Xsens) in comparison to a motion capture system (Vicon) during lifting tasks, and establish the discriminative validity of a wireless electromyography (EMG) system for the evaluation of muscle activity. : Sixteen participants performed 12 simple tasks (shoulder flexion, abduction, scaption) and 16 complex lifting tasks (lifting crates of different weights at different heights). A Delsys Trigno EMG system was used to record anterior and middle deltoids' EMG activity, while the Xsens and Vicon simultaneously recorded shoulder kinematics. : For IMUs, correlation coefficients were high (simple task: >0.968; complex task: >0.84) and RMSEs were low (simple task: <6.72°; complex task: <11.5°). For EMG, a significant effect of weight, height and a weight x height interaction (anterior: p < 0.001; middle: p < 0.03) were observed for RMS EMG activity. : These results suggest that wireless EMG and IMUs are valid units that can be used to measure physical demand in workplace assessments.
工作场所适应是减少与工作相关的肩部疾病发展相关风险因素的首选干预方法。然而，大多数进行的工作场所评估都是主观的（例如，问卷调查）。需要进行定量评估来支持工作场所的适应。本研究的目的是评估惯性测量单元（IMU；MVN、Xsens）与运动捕捉系统（Vicon）在举升任务中的同时效度，并确定无线肌电图（EMG）系统评估肌肉活动的区分效度。 16 名参与者完成了 12 项简单任务（肩部屈曲、外展、scaption）和 16 项复杂举升任务（以不同高度举起不同重量的箱子）。使用 Delsys Trigno EMG 系统记录前三角肌和中三角肌的 EMG 活动，同时 Xsens 和 Vicon 同时记录肩部运动学。对于 IMU，相关系数较高（简单任务：>0.968；复杂任务：>0.84），均方根误差较低（简单任务：<6.72°；复杂任务：<11.5°）。对于 EMG，在前三角肌和中三角肌的 RMS EMG 活动中观察到重量、高度和重量 x 高度交互作用的显著影响（p < 0.001；p < 0.03）。 这些结果表明，无线 EMG 和 IMU 是有效的测量单元，可以用于测量工作场所评估中的体力需求。
