人类中从肱桡肌到肱三头肌运动神经元的Ia类传入纤维的寡突触抑制。
Oligosynaptic inhibition of group Ia afferents from brachioradialis to triceps brachii motor neurons in humans.
作者信息
Sato Toshiaki, Nito Mitsuhiro, Suzuki Katsuhiko, Fujii Hiromi, Hashizume Wataru, Miyasaka Takuji, Shindo Masaomi, Naito Akira
机构信息
Department of Occupational Therapy, Yamagata Prefectural University of Health Sciences, Yamagata, Japan.
Department of Anatomy and Structural Science, Yamagata University School of Medicine, 2-2-2 Iida-nishi, Yamagata, 990-9585, Japan.
出版信息
Muscle Nerve. 2018 Jan;57(1):122-128. doi: 10.1002/mus.25664. Epub 2017 Jun 5.
INTRODUCTION
This study examines effects of low-threshold afferents from the brachioradialis (BR) on excitability of triceps brachii (TB) motor neurons in humans.
METHODS
We evaluated the effects using a post stimulus time histogram (PSTH) and electromyogram averaging (EMG-A) methods in 13 healthy human participants. Electrical conditioning stimulation to the radial nerve branch innervating BR with the intensity below the motor threshold was delivered.
RESULTS
In the PSTH study, the stimulation produced a trough (inhibition) in 36/69 TB motor units for all the participants. A cutaneous stimulation never provoked such inhibition. The central latency of the inhibition was 1.5 ± 0.5 ms longer than that of the homonymous facilitation. In the EMG-A study, the stimulation produced inhibition in EMG-A of TB in all participants. The inhibition diminished with a tonic vibration stimulation to BR.
DISCUSSION
These findings suggest that oligosynaptic inhibition mediated by group Ia afferents from BR to TB exists in humans. Muscle Nerve 57: 122-128, 2018.
引言
本研究探讨了来自肱桡肌（BR）的低阈值传入神经对人类肱三头肌（TB）运动神经元兴奋性的影响。
方法
我们在13名健康人类受试者中使用刺激后时间直方图（PSTH）和肌电图平均（EMG-A）方法评估了这些影响。对支配BR的桡神经分支进行强度低于运动阈值的电刺激。
结果
在PSTH研究中，对于所有受试者，刺激在69个TB运动单位中的36个中产生了一个波谷（抑制）。皮肤刺激从未引发这种抑制。抑制的中枢潜伏期比同名易化的中枢潜伏期长1.5±0.5毫秒。在EMG-A研究中，刺激在所有受试者的TB的EMG-A中产生了抑制。通过对BR进行强直振动刺激，抑制作用减弱。
讨论
这些发现表明，在人类中存在由BR的Ia类传入神经介导的从BR到TB的寡突触抑制。《肌肉与神经》57: 122 - 128, 2018。
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