Hansson G-A, Balogh I, Ohlsson K, Skerfving S
Department of Occupational and Environmental Medicine, University Hospital, SE-221 85 Lund, Sweden.
J Electromyogr Kinesiol. 2004 Jun;14(3):355-67. doi: 10.1016/j.jelekin.2003.10.001.
Flexible biaxial goniometers are extensively used for measuring wrist positions and movements. However, they display an inherent crosstalk error. The aim was to evaluate the effect, of this error, on summary measures used for characterizing manual work. A goniometer and a torsiometer were combined into one device. An algorithm that effectively compensated for crosstalk was developed. Recordings from 25 women, performing five worktasks, were analyzed, both with and without compensation for crosstalk. The errors in the 10th, 50th and 90th percentiles of the flexion/extension distributions were small, on average <1 degrees. The ulnar/radial deviation distributions were weakly dependent on forearm position. The flexion/extension velocity measures were, for the 50th and 90th percentiles, as well as the mean velocity, consistently underestimated by, on average, 3.9%. For ulnar/radial deviation, the velocity errors were less consistent. Mean power frequency, which is a measure of repetitiveness, was insensitive (error <1%) to crosstalk. The forearm supination/pronation angular distributions were wider, and the velocities higher, than for the wrists. Considering wrist/hand exposure in epidemiologic studies, as well as for establishing and surveillance of exposure limits for prevention of work-related upper extremity musculoskeletal disorders, the crosstalk error can, when considering other errors and sources to variation, be disregarded.
柔性双轴测角仪被广泛用于测量手腕的位置和运动。然而，它们存在固有的串扰误差。本研究旨在评估这种误差对用于表征体力劳动的汇总指标的影响。将一个测角仪和一个扭转计组合成一个装置。开发了一种有效补偿串扰的算法。对25名女性执行五项工作任务的记录进行了分析，分析时分别考虑了有无串扰补偿的情况。屈伸分布的第10、第50和第90百分位数的误差较小，平均<1度。尺桡偏斜分布对前臂位置的依赖性较弱。对于屈伸速度测量，第50和第90百分位数以及平均速度始终被低估，平均低估3.9%。对于尺桡偏斜，速度误差不太一致。作为重复性度量的平均功率频率对串扰不敏感（误差<1%）。前臂旋前/旋后的角度分布比手腕更宽，速度更高。在流行病学研究中考虑手腕/手部暴露情况，以及在制定和监测预防与工作相关的上肢肌肉骨骼疾病的暴露限值时，在考虑其他误差和变异来源的情况下，串扰误差可以忽略不计。
