Alteration of proton diffusivity associated with passive muscle extension and contraction
Alteration of proton diffusivity associated with passive muscle extension and contraction
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DOI：
10.1002/jmri.21302
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发表时间：
2008-04-01
影响因子：
4.4
通讯作者：
Honda, Hiroshi
中科院分区：
文献类型：
--
作者：
Hatakenaka, Masamitsu;Matsuo, Yoshio;Honda, Hiroshi
目的：为了确定被动肌肉伸展和收缩是否影响肌肉的质子扩散率。材料和方法：五名男性受试者进行了检查。分数各向异性（FA）和主要（lambda（1）），secondary（lambda（2））和第三特征值比较踝关节被动跖屈和被动背屈状态下右侧胫骨前肌和内侧腓肠肌的λ（3）。在胫骨前肌，背屈时FA和lambda（1）显著降低（P < 0.01和P < 0.01），但背屈时λ（3）显著增加（P = 0.02）。腓肠肌背屈时FA和λ（1）显著高于跖屈时（P <0.0 1和P <0.0 1），而λ（3）显著低于跖屈时（P <0.0 1）。λ（2）值在胫前肌和腓肠肌内侧均无显著变化。结论：被动关节运动引起的肌肉被动伸展和收缩会影响肌肉的质子扩散率。这种质子扩散率的改变可能与肌肉的微观结构变化有关。
Purpose: To determine whether passive muscle extension and contraction affect the proton diffusivity of the muscle.Materials and Methods: Five male subjects were examined. The fractional anisotropy (FA), and primary (lambda(1)), secondary (lambda(2)), and tertiary eigenvalues (lambda(3)) of the right tibialis anterior and medial gastrocnemius muscles were compared between conditions of passive plantar flexion and passive dorsiflexion of the ankle joint.Results: In the tibialis anterior, FA, and lambda(1) at dorsiflexion decreased significantly (P < 0.01 and P < 0.01, respectively) compared to those at plantar flexion, but lambda(3) at dorsiflexion increased significantly (P = 0.02). In the gastrocnemius, FA and lambda(1) at dorsiflexion increased significantly (P < 0.0 1 and P < 0.0 1, respectively) compared to those at plantar flexion, but lambda(3) at dorsiflexion decreased significantly (P < 0.01). The lambda(2) value showed no significant change in either the tibialis anterior or medial gastrocnemius.Conclusion: The results indicate that passive muscle extension and contraction associated with passive joint movement would affect the proton diffusivity of the muscle. This alteration of proton diffusivity is probably associated with microscopic structural changes of the muscle.