Department of Occupational and Environmental Medicine, University Hospital, S-221 85 Lund, Sweden.
J Electromyogr Kinesiol. 1996 Mar;6(1):23-35. doi: 10.1016/1050-6411(95)00017-8.
In epidemiological studies of occupational musculoskeletal disorders there is a need for quantitative exposure measurements of the physical work load. In studies of neck and upper limb disorders the so-called cumulative trauma disorders (CTDs), in particular the carpal tunnel syndrome, the positions and movements of the wrist are of special interest. A biaxial flexible electrogoniometer was used to measure continuously, with a sampling rate of 20 Hz, wrist flexion/extension and abduction/adduction angles up to 27 min. Evaluation of the influence of rotation on the goniometer showed some inherent crosstalk, which, however, did not invalidate the results. For occupational repetitive work, 99.5% of the signal power was contained in the 0-5 Hz band. Two-dimensional angle distributions and power spectra gave comprehensive information about wrist postures and movements. Measures reflecting both static and dynamic properties were derived from time and frequency domains. These measures give quantitative information on different potential risk factors and are therefore useful in epidemiological studies. Mean power frequency (MPF) is suggested as a generalized measure of repetitiveness. The method was applied in field studies of fish processing industry workers with highly repetitive work and risk of CTD.
在职业肌肉骨骼障碍的流行病学研究中，需要对物理工作负荷进行定量的暴露测量。在颈部和上肢疾病的研究中，特别是腕管综合征等累积性创伤疾病，手腕的姿势和运动特别重要。双轴柔性电子量角器以 20Hz 的采样率连续测量腕关节的屈伸和外展/内收角度，最长可达 27 分钟。对旋转对量角器影响的评估表明存在一些固有串扰，但这并没有使结果无效。对于职业重复性工作，信号功率的 99.5%包含在 0-5Hz 频段内。二维角度分布和功率谱提供了有关手腕姿势和运动的全面信息。从时域和频域得出反映静态和动态特性的措施。这些措施提供了有关不同潜在风险因素的定量信息，因此在流行病学研究中很有用。平均功率频率（MPF）被建议作为重复性的通用度量。该方法应用于鱼类加工行业具有高度重复性工作和累积性创伤疾病风险的工人的现场研究中。
