CREEP RESPONSE OF THE LUMBAR SPINE TO PROLONGED FULL FLEXION
CREEP RESPONSE OF THE LUMBAR SPINE TO PROLONGED FULL FLEXION
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DOI：
10.1016/0268-0033(92)90007-q
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发表时间：
1992-02-01
影响因子：
1.8
通讯作者：
BROWN, S
中科院分区：
文献类型：
--
作者：
MCGILL, SM;BROWN, S
记录了 27 名男性和 20 名女性受试者在持续 20 分钟的长时间屈曲时刻下完全腰部屈曲的时间过程。 20 分钟内峰值屈曲增加了 5.5 度。屈曲蠕变数据符合时间常数为 9.4 分钟的一阶阶跃输入响应。在恢复阶段还记录了最大屈曲，持续 30 分钟，表明受试者在恢复放松前凸后 2 分钟内恢复了大约 50% 的静息关节刚度，尽管完全恢复所需的时间比屈曲蠕动更长，表明存在粘弹性滞后。因此，建议那些经历长时间完全屈曲姿势的人（例如坐着的仓库托运人/收货人、园丁或建筑工人）在进行高要求的体力活动之前站立和行走几分钟，这可能是谨慎的做法。事实上，在完全屈曲之后，暂时的关节屈曲松弛可能会增加某些组织过度屈曲损伤的风险。
The time course of full lumbar flexion under a prolonged flexion moment, lasting 20 min, was documented in 27 male and 20 female subjects. Peak flexion increased by 5.5-degrees over the 20 min. The flexion-creep data was fitted with a first-order step input response having a time constant of 9.4 min. Maximum flexion was also documented over the recovery phase, lasting 30 min, indicating that subjects regained approximately 50% of their resting joint stiffness within 2 min of resuming relaxed lordosis, although full recovery took longer than the flexion-creep, indicating the presence of viscoelastic hysteresis. For this reason it may be prudent to advise those who experience prolonged full flexion postures (as might a seated warehouse shipper/receiver, gardener, or construction worker) to stand and walk for a few minutes prior to performing demanding manual exertions. Indeed, temporary joint flexion laxity, following a bout of full flexion, may increase the risk of hyperflexion injury to certain tissues.