Ghafouri M, Thullier F, Gurfinkel V S, Lestienne F G
Laboratoire de Biologie et de Physiologie du Comportement, URA-CNRS no. 1293, Université Henri Poincaré-Nancy I, Vandoeuvre-les-Nancy, France.
Neurosci Lett. 1998 Jun 26;250(1):61-5. doi: 10.1016/s0304-3940(98)00335-8.
Muscular after-contraction (MA-C) and the ongoing postural reaction of the body was studied in standing and sitting subjects in two visual situations: eyes open or closed. EMG of trapezius and latissimus dorsalis and 3D kinematic recordings of the left scapula were analysed. The release of the long-lasting sustained isometric contraction at the level of the scapula produced a muscular after-contraction consisting of involuntary muscular contraction associated with a trunk movement similar to the unroll of a spiral. The unroll of the spiral is in the opposite direction when we compare the standing and sitting situations. We suppose that the muscular after-contraction reveals the activity of central tonigenic structures in evoking involuntary trunk movements in humans and stresses the importance of the initial postural situation (standing or sitting) and the visual condition in the characteristics of these involuntary movements.
在两种视觉条件下（睁眼或闭眼），对站立和坐着的受试者的肌肉收缩后效应（MA-C）和身体持续的姿势反应进行了研究。分析了斜方肌和背阔肌的肌电图以及左肩胛骨的三维运动学记录。在肩胛骨水平释放长时间持续的等长收缩会产生肌肉收缩后效应，其包括与类似于螺旋展开的躯干运动相关的非自愿肌肉收缩。当比较站立和坐着的情况时，螺旋展开的方向相反。我们推测，肌肉收缩后效应揭示了中枢张力产生结构在诱发人类非自愿躯干运动中的活动，并强调了初始姿势状态（站立或坐着）和视觉条件在这些非自愿运动特征中的重要性。
