scholarly journals Excitability of Spinal Motor Neuron Function after the Transcutaneous Electrical Stimulation (TES) in Healthy Subjects -F-wave Study-

2006 ◽  
Vol 9 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Hiroaki Hirose ◽  
Toshiaki Suzuki ◽  
Tomoaki Shimada
Keyword(s):  
Electrical Stimulation ◽  
Motor Neuron ◽  
Healthy Subjects ◽  
Transcutaneous Electrical Stimulation ◽  
Spinal Motor Neuron ◽  
Spinal Motor ◽  
F Wave ◽  
Neuron Function

scholarly journals The Effect of Transcutaneous Electrical Stimulation on Spinal Motor Neuron Excitability in People Without Known Neuromuscular Diseases: The Roles of Stimulus Intensity and Location

2002 ◽  
Vol 82 (4) ◽  
pp. 354-363 ◽  
Author(s):  
SG Patrick Hardy ◽  
Thomas B Spalding ◽  
Hao Liu ◽  
Todd G Nick ◽  
Rebecca H Pearson ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Motor Neuron ◽  
Stimulus Intensity ◽  
Neuromuscular Diseases ◽  
H Reflex ◽  
Transcutaneous Electrical Stimulation ◽  
Spinal Motor Neuron ◽  
Spinal Motor ◽  
Neuron Excitability ◽  
Motor Neuron Excitability

AbstractBackground and Purpose. The Hoffmann reflex (H-reflex) is widely acknowledged as an indirect indicator of spinal motor neuron excitability. The purpose of this study was to determine whether transcutaneous electrical stimulation (TES), applied over the dorsiflexors or plantar flexors of the ankle, would alter the soleus muscle's H-reflex. Attention was focused on the roles of stimulus intensity and location. Subjects. Thirty-two volunteers without known neuromuscular diseases (17 women [53%]; mean years of age=27, SD=7.3, range=21–48) were studied. Methods. Subjects were randomly assigned to 1 of 4 groups, and TES was administered for 15 minutes. Stimulation site and intensity varied according to group assignment. H-reflexes were recorded before and for 10 minutes after TES. Results. H-reflex amplitudes increased following TES at sensory threshold, whereas H-reflex amplitudes did not change following TES at 1.5 times motor threshold. The site of stimulation did not influence the resulting H-reflexes. Discussion and Conclusion. Low-intensity TES increases H-reflex amplitudes (and presumably the excitability of spinal motor neurons to Ia afferent input) in subjects without known neuromuscular diseases. High-intensity TES had little influence on H-reflex amplitudes.

scholarly journals Thenar Muscle Motor Imagery Increases Spinal Motor Neuron Excitability of the Abductor Digiti Minimi Muscle

2021 ◽  
Vol 15 ◽  
Author(s):  
Yoshibumi Bunno ◽  
Toshiaki Suzuki
Keyword(s):  
Motor Neuron ◽  
Muscle Activity ◽  
Emg Activity ◽  
Thenar Muscle ◽  
Spinal Motor Neuron ◽  
Spinal Motor ◽  
Neuron Excitability ◽  
Motor Neuron Excitability ◽  
F Wave ◽  
Rest Condition

When a person attempts intended finger movements, unintended finger movement also occur, a phenomenon called “enslaving”. Given that motor imagery (MI) and motor execution (ME) share a common neural foundation, we hypothesized that the enslaving effect on the spinal motor neuron excitability occurs during MI. To investigate this hypothesis, electromyography (EMG) and F-wave analysis were conducted in 11 healthy male volunteers. Initially, the EMG activity of the left abductor digiti minimi (ADM) muscle during isometric opposition pinch movement by the left thumb and index finger at 50% maximal effort was compared with EMG activity during the Rest condition. Next, the F-wave and background EMG recordings were performed under the Rest condition, followed by the MI condition. Specifically, in the Rest condition, subjects maintained relaxation. In the MI condition, they imagined isometric left thenar muscle activity at 50% maximal voluntary contraction (MVC). During ME, ADM muscle activity was confirmed. During the MI condition, both F-wave persistence and the F-wave/M-wave amplitude ratio obtained from the ADM muscle were significantly increased compared with that obtained during the Rest condition. No difference was observed in the background EMG between the Rest and MI conditions. These results suggest that MI of isometric intended finger muscle activity at 50% MVC facilitates spinal motor neuron excitability corresponding to unintended finger muscle. Furthermore, MI may induce similar modulation of spinal motor neuron excitability as actual movement.

[P2.32]: Suppression of interneuron programs and maintenance of selected spinal motor neuron fates by the transcription factor AML1/Runx1

2008 ◽  
Vol 26 (8) ◽  
pp. 877-877 ◽  
Author(s):  
N. Stifani ◽  
A.R.O. Freitas ◽  
A. Liakhovitskaia ◽  
A. Medvinsky ◽  
A. Kania ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Motor Neuron ◽  
Spinal Motor Neuron ◽  
Spinal Motor
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