Spinal manipulation force and duration affect vertebral movement and neuromuscular responses
Spinal manipulation force and duration affect vertebral movement and neuromuscular responses
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DOI：
10.1016/j.clinbiomech.2005.10.006
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发表时间：
2006-03-01
影响因子：
1.8
通讯作者：
Harrison, DD
中科院分区：
文献类型：
--
作者：
Colloca, CJ;Keller, TS;Harrison, DD
背景以前的研究在人类受试者的生物力学和神经生理反应的脉冲脊柱推拿推力，但很少有人知道的神经力学效应的不同推力-时间profiles. Methods。将10只青少年美利奴羊麻醉，并使用计算机控制的机械测试装置对L3棘突施加后前机械推力。采用重复测量方差分析，研究了三种不同的脉冲持续时间（10、100、200 ms，力= 80 N）和三种不同的力振幅（20、40、60 N，脉冲持续时间= 100 ms）对腰椎运动反应（L3位移，L1、L2加速度）和标准化多裂肌肌电图反应（L3、L4）的影响。增加L3后前力幅度导致L3后前椎体位移（p < 0.001）和相邻节段（L1，L2）后前加速度反应（p < 0.001）线性增加4倍。在20-80 N力范围（100 ins）内，L3位移与加速度响应线性相关（p < 0.001）。在恒定力下，与100 ms（19%，p = 0.005）和200 ms（16%，p = 0.023）推力相比，10 ms推力导致L3位移降低近5倍，节段（L2）加速度响应显著增加。标准化肌电反应在较高振幅下随力幅值的增加而线性增加，并受到机械激励脉冲持续时间的明显影响。观察到绵羊腰椎的生物力学和神经肌肉反应的变化，以响应脊柱推拿推力的力-时间特征的变化，可能是相关临床结局的潜在机制。(C)2005爱思唯尔有限公司保留所有权利。
Background. Previous study in human subjects has documented biomechanical and neurophysiological responses to impulsive spinal manipulative thrusts, but very little is known about the neuromechanical effects of varying thrust force-time profiles.Methods. Ten adolescent Merino sheep were anesthetized and posteroanterior mechanical thrusts were applied to the L3 spinous process using a computer-controlled, mechanical testing apparatus. Three variable pulse durations (10, 100, 200 ms, force = 80 N) and three variable force amplitudes (20, 40, 60 N, pulse duration = 100 ms) were examined for their effect on lumbar motion response (L3 displacement, L1, L2 acceleration) and normalized multifidus electromyographic response (L3, L4) using a repeated measures analysis of variance.Findings. Increasing L3 posteroanterior force amplitude resulted in a fourfold linear increase in L3 posteroanterior vertebral displacement (p < 0.001) and adjacent segment (L1, L2) posteroanterior acceleration response (p < 0.001). L3 displacement was linearly correlated (p < 0.001) to the acceleration response over the 20-80 N force range (100 ins). At constant force, 10 ms thrusts resulted in nearly fivefold lower L3 displacements and significantly increased segmental (L2) acceleration responses compared to the 100 ms (19%, p = 0.005) and 200 ms (16%, p = 0.023) thrusts. Normalized electromyographic responses increased linearly with increasing force amplitude at higher amplitudes and were appreciably affected by mechanical excitation pulse duration.Interpretation. Changes in the biomechanical and neuromuscular response of the ovine lumbar spine were observed in response to changes in the force-time characteristics of the spinal manipulative thrusts and may be an underlying mechanism in related clinical outcomes. (C) 2005 Elsevier Ltd. All rights reserved.