Larivière C, Gagnon D, Gravel D, Dumas J, Goyette M, Loisel P
Research Center, Montreal Rehabilitation Institute, Que., Montreal, Canada.
Clin Biomech (Bristol). 2001 Jan;16(1):80-3. doi: 10.1016/s0268-0033(00)00068-1.
The purpose of the study was to describe a new static triaxial dynamometer designed to monitor the lateral bending and axial rotation moments during trunk extension efforts.
Most studies on back muscle function using electromyographic spectral analysis have not controlled moments produced about the three orthopaedic axes during trunk extension efforts. Criteria to control lateral bending and axial rotation moments during extension efforts have not been proposed in the literature.
Fourteen healthy subjects performed three trunk extension ramp contractions (0-100% of the maximal voluntary contraction). Triaxial L5/S1 moments at 20%, 40%, 60% and 80% of the maximal voluntary contraction in extension were extracted.
During the extension efforts, the lateral bending and axial rotation moments at L5/S1 increased significantly across the force levels and reached 6.2 Nm (SD: 6.6) and 6.1 Nm (SD: 4.5), respectively, at 80% of the maximal voluntary contraction. Tolerance limits were proposed to control these associated efforts in the context of the electromyographic analysis of back muscles. Relevance. Simultaneous measurement of lateral bending and axial rotation moments at L5/S1 during extension efforts might help to explain and control load sharing between back muscles during extension efforts.
本研究的目的是描述一种新型静态三轴测力计，其设计用于监测躯干伸展时的侧屈和轴向旋转力矩。
大多数使用肌电图频谱分析对背部肌肉功能进行的研究，在躯干伸展时未对围绕三个正交轴产生的力矩进行控制。文献中尚未提出在伸展时控制侧屈和轴向旋转力矩的标准。
14名健康受试者进行了三次躯干伸展斜坡收缩（最大自主收缩的0 - 100%）。提取了伸展时最大自主收缩的20%、40%、60%和80%时的L5/S1三轴力矩。
在伸展过程中，L5/S1处的侧屈和轴向旋转力矩在各力水平上均显著增加，在最大自主收缩的80%时分别达到6.2 Nm（标准差：6.6）和6.1 Nm（标准差：4.5）。提出了耐受限度，以便在背部肌肉的肌电图分析中控制这些相关的作用力。相关性。在伸展过程中同时测量L5/S1处的侧屈和轴向旋转力矩，可能有助于解释和控制伸展过程中背部肌肉之间的负荷分担。
