Wang Simon, McGill Stuart M
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, ON,Canada.
J Appl Biomech. 2008 May;24(2):166-74. doi: 10.1123/jab.24.2.166.
Spine stability is ensured through isometric coactivation of the torso muscles; however, these same muscles are used cyclically to assist ventilation. Our objective was to investigate this apparent paradoxical role (isometric contraction for stability or rhythmic contraction for ventilation) of some selected torso muscles that are involved in both ventilation and support of the spine. Eight, asymptomatic, male subjects provided data on low back moments, motion, muscle activation, and hand force. These data were input to an anatomically detailed, biologically driven model from which spine load and a lumbar spine stability index was obtained. Results revealed that subjects entrained their torso stabilization muscles to breathe during demanding ventilation tasks. Increases in lung volume and back extensor muscle activation coincided with increases in spine stability, whereas declines in spine stability were observed during periods of low lung inflation volume and simultaneously low levels of torso muscle activation. As a case study, aberrant ventilation motor patterns (poor muscle entrainment), seen in one subject, compromised spine stability. Those interested in rehabilitation of patients with lung compromise and concomitant back troubles would be assisted with knowledge of the mechanical links between ventilation during tasks that impose spine loading.
脊柱稳定性通过躯干肌肉的等长协同激活来确保；然而，这些相同的肌肉也被周期性地用于辅助通气。我们的目的是研究一些选定的既参与通气又参与脊柱支撑的躯干肌肉的这种明显矛盾的作用（等长收缩用于稳定或节律性收缩用于通气）。八名无症状男性受试者提供了关于腰部力矩、运动、肌肉激活和手部力量的数据。这些数据被输入到一个解剖学详细、生物驱动的模型中，从中获得脊柱负荷和腰椎稳定性指数。结果显示，在要求较高的通气任务中，受试者会带动其躯干稳定肌肉进行呼吸。肺容积增加和背部伸肌激活增加与脊柱稳定性增加同时出现，而在肺膨胀容积低且躯干肌肉激活水平同时较低的时期，观察到脊柱稳定性下降。作为一个案例研究，在一名受试者中看到的异常通气运动模式（肌肉带动不佳）损害了脊柱稳定性。那些关注肺部受损并伴有背部问题患者康复的人将从了解在施加脊柱负荷的任务中通气之间的机械联系的知识中得到帮助。
