Webber Sandra C, Kriellaars Dean J
School of Medical Rehabilitation, Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada R3E 0T6.
Clin Biomech (Bristol). 2004 Oct;19(8):777-83. doi: 10.1016/j.clinbiomech.2004.05.014.
To determine the effect of trunk stabilization instruction on lumbar acceleration.
There is a paucity of information showing the impact of stabilization training and instruction on lumbar motion. Neuromuscular activation patterns have been implicated as an etiological factor in low back disorders. Knowledge of the short-term alterations in lumbar motion control, as assessed by acceleration, is an important first step to understanding the impact of trunk stabilization programs.
A calibrated, uniaxial accelerometer was positioned over the L4 spinous process of subjects (n =33) to record anterior/posterior acceleration during 10 repetitions of lower and upper limb movements (hip flexion/extension and biceps curl) before and after standardized stabilization instruction.
Each repetition exhibited four stereotypical phases of acceleration. Instruction resulted in a substantial reduction in peak lumbar acceleration magnitude (P < 0.01) for all movement phases for both exercises (hip flexion 39.5%, biceps curl 30.8%). Lumbar peak accelerations for the biceps curl were substantially higher than peak accelerations for hip flexion (P < 0.05).
This study demonstrated that stabilization instruction results in immediate alteration of kinematics (global reduction of limb movement-induced lumbar acceleration) during upper and lower body movements. Reduced lumbar acceleration levels would arise from a change in the motor control strategy of trunk musculature due to instruction.
确定躯干稳定训练指导对腰椎加速度的影响。
关于稳定训练指导对腰椎运动影响的信息匮乏。神经肌肉激活模式被认为是下背部疾病的一个病因。通过加速度评估了解腰椎运动控制的短期变化，是理解躯干稳定训练计划影响的重要第一步。
在33名受试者的L4棘突上方放置一个经过校准的单轴加速度计，以记录在标准化稳定训练指导前后进行10次下肢和上肢运动（髋关节屈伸和二头肌弯举）时的前后加速度。
每次重复均呈现出四个典型的加速度阶段。训练指导使两种运动（髋关节屈伸降低39.5%，二头肌弯举降低30.8%）所有运动阶段的腰椎加速度峰值显著降低（P<0.01）。二头肌弯举的腰椎加速度峰值显著高于髋关节屈伸的峰值加速度（P<0.05）。
本研究表明，稳定训练指导会导致上半身和下半身运动期间运动学的即刻改变（肢体运动引起的腰椎加速度整体降低）。训练指导导致的腰椎加速度水平降低，可能源于躯干肌肉组织运动控制策略的改变。
