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首页> 外文会议>17th World Congress on Ergonomics(第十七届国际人类工效学大会）论文集 >Comparisons of the Accuracies of Two Methods for Assessing Trunk Posture Associated with Low Back Disorders
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Comparisons of the Accuracies of Two Methods for Assessing Trunk Posture Associated with Low Back Disorders

机译：腰背疾病相关的躯干姿势评估的两种方法的准确性比较

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The purpose of the present study was to determine the accuracies of two methods (human posture simulation and subjective posture rating) for assessing trunk posture for use in studies of prevention of low back disorders due to manual lifting. Subjective rating methods for analyzing a large number of lifts are typically time-consuming and prone to errors. The human posture simulation, developed by researchers at National Institute for Occupational Safety and Health (NIOSH) may expedite the process of the assessment. The simulation method involved acquisition of body postural data with an electro-magnetic motion capture system (Ascension Flock of Birds MotionStar(R) with Motion Monitor software, Innovative Sport Training Inc., Chicago, 2003). The system was capable of measuring the 15 body joint angles defined by the University of Michigan抯 Three Dimensional Static Strength Prediction Program (3DSSPP) and the geometric parameters used for calculating the Lifting Index (LI) of the NIOSH Revised Lifting Equation (RNLE). Among the variables measured by the system, trunk flexion defined by 3DSSPP and lift asymmetry defined by RNLE were used for comparing the accuracies of the two methods. Eight subjects (5 males and 3 females) participated in this study. Six common lifting postures of different degrees of trunk flexion (0° 30° >60°, and asymmetry (0° 45° posed by the subjects were measured with the motion capture system and used as the gold standard. The accuracy, precision and reliability of the simulation method were evaluated by comparing the results of the gold standard to simulating the photographs of the posed postures performed by the same subjects. The absolute difference between the simulation data and the gold standard was used as the error. The photographs were also sent to eight professional ergonomists for rating the postures. The results of the subjective posture rating were compared to the gold standard. The average errors in simulating and rating trunk flexion were found to be 6° and 13° (significantly different, p<0.05), respectively. The average errors in simulating and rating lift asymmetry were approximately 14?and 16? respectively. The average precision measures of the rating method for assessing both trunk flexion and asymmetry were slightly better than the simulation method, but the average precision measures of both methods were reasonably small (<6°. The average intraclass correlation coefficients of the simulation and rating methods for assessing trunk flexion were 0.82 and 0.65, respectively, indicating that the simulation method offered a better within-subject reliability for determining trunk flexion than the rating method. The findings suggest that the human postural simulation method is more accurate and reliable than the observation method for assessing general trunk posture associated with the development of low back disorders.
机译：本研究的目的是确定用于评估躯干姿势的两种方法（人体姿势模拟和主观姿势定级）的准确性，以用于预防由于手动抬起而引起的下背部疾病。用于分析大量电梯的主观评分方法通常很耗时并且容易出错。美国国家职业安全与健康研究所（NIOSH）的研究人员开发的人体姿势模拟可能会加快评估过程。该模拟方法涉及利用电磁运动捕获系统（带有运动监控器软件的Ascension Fowl of BirdsMotionStar®，Innovative Sport Training Inc.，芝加哥，2003年）来获取身体姿势数据。该系统能够测量由密歇根大学的三维静态强度预测程序（3DSSPP）定义的15个身体关节角度，以及用于计算NIOSH修正的提升方程（RNLE）的提升指数（LI）的几何参数。在系统测量的变量中，使用3DSSPP定义的躯干屈曲和RNLE定义的提升不对称性来比较这两种方法的准确性。八名受试者（5名男性和3名女性）参加了这项研究。使用运动捕捉系统测量了六个不同程度的躯干屈曲度（0°30°> 60°和不对称度（0°45°）的常见抬高姿势，并将其作为金标准。准确性，精确度和可靠性通过比较黄金标准的结果和模拟同一受试者所摆姿势的照片来评估模拟方法的有效性，并以模拟数据和黄金标准之间的绝对差异作为误差，并发送照片8位专业人体工程学专家对姿势进行评级，将主观姿势评级的结果与金标准进行比较，模拟和评级躯干屈曲的平均误差分别为6°和13°（差异显着，p <0.05），模拟和额定举升不对称性的平均误差分别约为14？和16 ?，用于评定躯干屈曲的额定值方法的平均精度值和不对称性比模拟方法要好一些，但是两种方法的平均精度测量值都相当小（<6°。评估躯干屈曲的模拟方法和评定方法的平均组内相关系数分别为0.82和0.65，这表明该模拟方法为躯干屈曲提供了比评定方法更好的受试者内部可靠性。研究结果表明，人体姿势模拟方法比观察方法可更准确，更可靠，可用于评估与下背疾病发展相关的一般躯干姿势。

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