Department of Biomedical Engineering, Sahand University of Technology, Tabriz, Iran.
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
Proc Inst Mech Eng H. 2023 Jul;237(7):855-868. doi: 10.1177/09544119231177564. Epub 2023 Jun 8.
Recent studies show that asymmetric movements are important Low Back Disorders risk factors. Measuring the trunk strength and identifying the coupling effects in different postures can provide an objective tool to assess one's task capacity. This paper estimates the maximum performance capacity for isometric trunk extension and accompanying torques. Thirty males performed maximum voluntary isometric extension in 33 trunk postures on Sharif Lumbar Isometric Strength Tester device. Corresponding moments and angular positions were collected. Second-order full response surface models (RSM) were exploited to formulate the relationship between strengths and three trunk angles. The results of correlation coefficient, percent of standard estimation error and lack of fit reflected the adequacy of models. In conclusion, the main torque was the extension, but at the same time lateral bending and rotation torques were observed. For predicting these three torques in a specific posture and injury prevention, the second order RSM is a useful tool. The presented models can be used in the fields of ergonomics, occupational biomechanics and sport.
最近的研究表明，不对称运动是导致下背部疾病的重要因素。测量躯干力量并确定不同姿势下的耦合效应，可以提供一种客观的工具来评估一个人的任务能力。本文估计了等长躯干伸展和伴随扭矩的最大性能容量。三十名男性在 Sharif 腰椎等长强度测试仪设备上进行了 33 种躯干姿势的最大自主等长伸展。收集了相应的力矩和角度位置。利用二阶全响应面模型（RSM）来构建强度与三个躯干角度之间的关系。相关系数、标准估计误差的百分比和拟合不足反映了模型的充分性。总之，主要的扭矩是伸展，但同时也观察到了侧向弯曲和旋转扭矩。为了预测特定姿势下的这三个扭矩和预防损伤，二阶 RSM 是一种有用的工具。所提出的模型可用于人体工程学、职业生物力学和运动领域。
