颈部肌梭传入纤维能激活下肢的梭内肌运动神经元吗？
Can neck muscle spindle afferents activate fusimotor neurons of the lower limb?
机构信息
Discipline of Chiropractic, School of Health Sciences, Royal Melbourne Institute of Technology University, Melbourne, Australia.
出版信息
Muscle Nerve. 2012 Mar;45(3):376-84. doi: 10.1002/mus.22300.
INTRODUCTION
We investigated whether vibratory stimulation of the dorsal neck muscles activates fusimotor neurons of lower limb muscles in relaxed human subjects.
METHODS
The triceps surae (TS) muscles of seated subjects (n = 15) were conditioned to leave their muscle spindles in either an insensitive (hold-long) or sensitive (hold-short) state. A vibrator (80 HZ) was applied to the dorsal neck muscles for 10 seconds. The tendon jerk was evoked from the right TS immediately before (during) or 5 seconds after (interposed) the offset of vibration.
RESULTS
The size of the reflex after hold-long muscle conditioning and after neck vibration was significantly smaller than the control hold-short reflex (P < 0.001). However, after hold-short conditioning, neck vibration significantly increased tendon jerk amplitude, both during (P = 0.001) and interposed (P = 0.026).
CONCLUSION
Dorsal neck vibration increases spinal reflex excitability of the TS in relaxed and seated subjects, but not through fusimotor excitation.
引言
我们研究了在放松状态下的人体中，颈部背部肌肉的振动刺激是否会激活下肢肌肉的梭内肌神经元。
方法
采用坐姿，对 15 名被试的比目鱼肌（TS）进行条件反射处理，使其肌梭处于不敏感（保持拉长）或敏感（保持缩短）状态。振动器（80Hz）对颈部背部肌肉施加 10 秒的振动。在振动结束前（过程中）或结束后 5 秒（间隔），从右侧 TS 肌腱引发牵张反射。
结果
在保持拉长肌肉条件反射和颈部振动后，反射的幅度明显小于对照的保持缩短反射（P<0.001）。然而，在保持缩短条件反射后，颈部振动显著增加了腱反射幅度，无论是在过程中（P=0.001）还是间隔中（P=0.026）。
结论
在放松和坐姿的受试者中，颈部背部振动增加了 TS 的脊髓反射兴奋性，但不是通过梭内肌兴奋。
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