Disturbance and recovery of trunk mechanical and neuromuscular behaviours following prolonged trunk flexion: influences of duration and external load on creep-induced effects
Disturbance and recovery of trunk mechanical and neuromuscular behaviours following prolonged trunk flexion: influences of duration and external load on creep-induced effects
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DOI：
10.1080/00140139.2011.614357
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发表时间：
2011-01-01
期刊：
影响因子：
2.4
通讯作者：
Madigan, Michael L.
中科院分区：
文献类型：
--
作者：
Bazrgari, Babak;Hendershot, Brad;Madigan, Michael L.
躯干屈曲会对脊柱造成不利的机械影响，并与较高的下腰痛发生率相关。为了检验蠕变对躯干行为的影响，受试者在暴露时间和外部负荷的几种组合中暴露于完全躯干弯曲。躯干机械和神经肌肉行为在暴露前和暴露后以及在恢复期间使用突然扰动获得。躯干固有刚度随着屈曲时间的增加和外部负荷的存在而降低。固有僵硬的恢复需要比暴露持续时间更长的时间，并且受暴露持续时间的影响。反射主干反应在暴露后即刻增加，但很快恢复(类似于2.5分钟)。在蠕变形变暴露后，躯干反射行为的改变可能不能提供足够的补偿，以允许同时减少的固有僵硬完全恢复，这可能会增加由于脊柱不稳定而造成的损伤风险。
Trunk flexion results in adverse mechanical effects on the spine and is associated with a higher incidence of low back pain. To examine the effects of creep deformation on trunk behaviours, participants were exposed to full trunk flexion in several combinations of exposure duration and external load. Trunk mechanical and neuromuscular behaviours were obtained pre- and post-exposure and during recovery using sudden perturbations. Intrinsic trunk stiffness decreased with increasing flexion duration and in the presence of the external load. Recovery of intrinsic stiffness required more time than the exposure duration and was influenced by exposure duration. Reflexive trunk responses increased immediately following exposure but recovered quickly (similar to 2.5 min). Alterations in reflexive trunk behaviour following creep deformation exposures may not provide adequate compensation to allow for complete recovery of concurrent reductions in intrinsic stiffness, which may increase the risk of injury due to spinal instability.