Department of Osteopathic Manipulative Medicine, Texas College of Osteopathic Medicine, University of North Texas Health Science Center, Fort Worth, TX 76107, United States.
J Electromyogr Kinesiol. 2011 Oct;21(5):762-6. doi: 10.1016/j.jelekin.2011.07.008. Epub 2011 Aug 17.
The objective of the study was to measure postero-anterior stiffness of thoracolumbar spine from normal asymptomatic subjects at T(4), T(9), and L(2) levels using a standardized device and protocol. Sixteen volunteer subjects (eight males and eight females) meeting the inclusion and exclusion criteria were recruited for the study. Their T(4), T(9), and L(2) spinous processes were identified and marked. These spinous processes were cyclically loaded with 22.5 N, 45 N, 90 N, and 135 N fixed forces at 0.1 Hz in postero-anterior direction by a computer controlled and operated Therapeutic Spinal Mobilizer (TSM) for five cycles to the level of subject's acceptance of the load magnitude. The magnitude of the force and displacement experienced at the spinal level were recorded using a load cell and linear variable differential transducer. The stiffness was obtained from the slope of the load/deformation curve. The stiffness values were subjected to analysis of variance to determine the effect of independent variables. The stiffness at different levels was significantly different (p<0.0001) and it was significantly affected by the testing load (p<0.0001). The age, sex, height and weight were not significantly associated with the stiffness, neither were the cycles at the same load. The postero-anterior stiffness of the thoracolumbar spine is different at different spinal levels and varies with testing loads.
本研究旨在使用标准化设备和方案，测量 T(4)、T(9)和 L(2)水平正常无症状受试者的胸腰椎后前向刚度。 招募了 16 名符合纳入和排除标准的志愿受试者（8 名男性和 8 名女性）。 确定并标记了他们的 T(4)、T(9)和 L(2)棘突。 使用计算机控制和操作的 Therapeutic Spinal Mobilizer (TSM)，在 0.1 Hz 的后前方向上以 22.5 N、45 N、90 N 和 135 N 的固定力对这些棘突进行循环加载，共进行五个周期，直到受试者接受负载大小。 使用测力传感器和线性可变差动变送器记录脊柱水平的力和位移幅度。 从载荷/变形曲线的斜率获得刚度。 对刚度值进行方差分析以确定独立变量的影响。 不同水平的刚度差异具有统计学意义（p<0.0001），并且受到测试载荷的显著影响（p<0.0001）。 年龄、性别、身高和体重与刚度无显著相关性，同一载荷下的循环也无相关性。 胸腰椎的后前向刚度在不同脊柱水平上不同，并且随测试载荷而变化。
