Tianjin Key Lab of Exercise Physiology and Sports Medicine, College of Social Sport and Health Science, Tianjin University of Sport , Tianjin, China.
Department of Rehabilitation, Tianjin Union medical Center , Tianjin, China.
Res Sports Med. 2020 Oct-Dec;28(4):588-593. doi: 10.1080/15438627.2020.1745802. Epub 2020 Apr 8.
We investigated changes in the anticipatory activity of the leg and trunk muscles in preparation for a step during support surface perturbation. Eight healthy subjects performed stepping tasks under three conditions: normal, forward perturbation, and backward perturbation. R and C indices were calculated for the reciprocal and co-activation patterns of muscle pairs within the time intervals typical of anticipatory postural adjustments. When the support surface perturbation occurred, anticipatory muscle activations were predominantly in the C indices in the leg muscles. Significant differences in the maximum displacement of the centre of pressure were seen between conditions (FS vs NS; BS vs FS). The results suggest that activation of the leg muscles rather than the trunk muscles was modified to ensure equilibrium for taking a step in response to support surface perturbation.
我们研究了在支撑面扰动时准备迈步过程中腿部和躯干肌肉的预期活动变化。8 名健康受试者在三种条件下进行了迈步任务：正常、前向扰动和后向扰动。在典型的预期姿势调整时间间隔内，计算了肌肉对的反向和共同激活模式的 R 和 C 指数。当支撑面发生扰动时，腿部肌肉的 C 指数表现出主要的预期肌肉激活。在条件之间（FS 与 NS；BS 与 FS）观察到中心压力最大位移的显著差异。结果表明，腿部肌肉的激活而不是躯干肌肉的激活发生了改变，以确保在响应支撑面扰动时进行迈步以保持平衡。
