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首页> 外文期刊>Journal of Biomechanics >Computation of trunk equilibrium and stability in free flexion-extension movements at different velocities.
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Computation of trunk equilibrium and stability in free flexion-extension movements at different velocities.

机译：在不同速度下自由曲伸运动中躯干平衡度和稳定性的计算。

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摘要

Velocity of movement has been suggested as a risk factor for low-back disorders. The effect of changes in velocity during unconstrained flexion-extension movements on muscle activations, spinal loads, base reaction forces and system stability was computed. In vivo measurements of kinematics and ground reaction forces were initially carried out on young asymptomatic subjects. The collected kinematics of three subjects representing maximum, mean and minimum lumbar rotations were subsequently used in the kinematics-driven model to compute results during the entire movements at three different velocities. Estimated spinal loads and muscle forces were significantly larger in fastest pace as compared to slower ones indicating the effect of inertial forces. Spinal stability was improved in larger trunk flexion angles and fastest movement. Partial or full flexion relaxation of global extensor muscles occurred only in slower movements. Some local lumbar muscles, especially in subjects with larger lumbar flexionand at slower paces, also demonstrated flexion relaxation. Results confirmed the crucial role of movement velocity on spinal biomechanics. Predictions also demonstrated the important role on response of the magnitude of peak lumbar rotation and its temporal variation.
机译：运动速度被认为是腰背疾病的危险因素。计算了无限制的屈伸运动过程中速度变化对肌肉激活，脊柱负荷，基础反作用力和系统稳定性的影响。最初对年轻的无症状受试者进行了运动学和地面反作用力的体内测量。随后，在运动学驱动模型中使用了代表最大，平均和最小腰部旋转的三个对象的运动学信息，以三种速度在整个运动过程中计算结果。估计的脊椎负荷和肌肉力量以最快的速度明显大于慢速的力量，这表明惯性力的影响。在较大的躯干屈曲角度和最快的运动中，脊柱稳定性得到改善。仅在较慢的运动中才出现全局伸肌的部分或全部屈曲松弛。一些局部腰部肌肉，特别是腰部屈曲较大且步速较慢的受试者，也表现出屈曲松弛。结果证实了运动速度对脊柱生物力学的关键作用。预测还证明了对峰值腰椎旋转度及其时间变化的响应具有重要作用。

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