Neuromuscular control of lumbar instability following static work of various loads.
Neuromuscular control of lumbar instability following static work of various loads.
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各种负载静态工作后腰椎不稳定的神经肌肉控制。
DOI：
10.1002/mus.21214
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发表时间：
2009
期刊：
影响因子：
3.4
通讯作者：
Solomonow,Moshe
中科院分区：
文献类型：
--
作者：
Le,Brook;Davidson,Bradley;Solomonow,Deborah;Zhou,BingHe;Lu,Yun;Patel,Vikas;Solomonow,Moshe
在体内猫模型中评估了在低负荷和高负荷下长时间静态工作后对腰椎稳定性的神经肌肉控制。在20 N下工作10分钟，休息10分钟的六个阶段与接受相同协议但承受60 N高负荷的一组进行了比较。在多裂肌施加稳定收缩的瞬间，脊柱中产生位移和张力，并且其幅度从其肌电图（EMG）获得。在腰椎的各种粘弹性组织中出现了显著（P< 0.001）松弛，这些组织在休息后7小时内没有恢复。同时，低负荷组在运动后3-4 h内肌肉活动度明显降低（P< 0.001），而高负荷组仅在运动后1h内肌肉活动度明显降低（P< 0.001）。在此期间之后，肌肉组织通过高负荷组活动的显著增加（P< 0.001）和低负荷组的非显著增加来补偿粘弹性组织的松弛。得出的结论是，在1-3小时立即poststatic工作的粘弹性组织的稳定功能的显着下降，肌肉活动的显着减少是存在的，他们使脊柱不稳定，暴露于高风险的伤害。在低负荷下进行长时间的静态工作，虽然在工作过程中不会造成伤害，但不能被指定为“无风险”条件，因为它可能导致工作后受伤。肌肉神经39：71-82，2009
Neuromuscular control of lumbar stability following exposure to prolonged static work, under low and high loads, was assessed in the in vivo feline model. Six sessions of 10 min work at 20N with 10 min between rest was compared to a group subjected to the same protocol but carrying high loads of 60N. Displacement and tension developed in the spine at the instant the multifidus muscles applied stabilizing contractions, and their amplitudes were obtained from their electromyogram (EMG). Significant (P< 0.001) laxity developed in the various viscoelastic tissues of the lumbar spine that did not recover during and up to 7 h of rest postwork. Simultaneously, there was a significant (P< 0.001) decrease in muscular activity in the 3–4 h immediately postwork under low load but only during the first hour in the high load group. After that period the musculature compensated for the laxity of the viscoelastic tissues by a significant (P< 0.001) increase in activity in the high‐load group and a nonsignificant increase in the low group. It was concluded that during 1–3 h immediately poststatic work a significant decrease in the stabilizing function of viscoelastic tissues together with a significant decrease in muscular activity is present, and they render the spine unstable and exposed to high risk of injury. Performance of prolonged static work under low loads, while not harmful during the work, cannot be designated as a “no‐risk” condition, as it may result in injury postwork. Muscle Nerve 39: 71–82, 2009