scholarly journals Changes of muscle fiber conduction velocity and frequency parameters during fatigue of the masseter muscle

1989 ◽  
Vol 7 ◽  
pp. 71-76
Author(s):  
Tohru TOKUNAGA ◽  
Koichi KIMURA ◽  
Masahiro TANAKA ◽  
Takayoshi KAWAZOE
Keyword(s):  
Conduction Velocity ◽  
Muscle Fiber ◽  
Masseter Muscle ◽  
Muscle Fiber Conduction Velocity

scholarly journals Influence of Bite-raising on Muscle Fiber Conduction Velocity and EMG Frequency Components in Human Masseter Muscle.

1994 ◽  
Vol 38 (1) ◽  
pp. 25-34
Author(s):  
Tatsumasa Nabeshima ◽  
Masahiro Tanaka ◽  
Takayoshi Kawazoe ◽  
Tohru Tokunaga ◽  
Tatsumi Kaneda ◽  
...  
Keyword(s):  
Conduction Velocity ◽  
Muscle Fiber ◽  
Masseter Muscle ◽  
Muscle Fiber Conduction Velocity ◽  
Frequency Components

Changes in muscle fiber conduction velocity indicate recruitment of distinct motor unit populations

2003 ◽  
Vol 95 (3) ◽  
pp. 1045-1054 ◽  
Author(s):  
C. J. Houtman ◽  
D. F. Stegeman ◽  
J. P. Van Dijk ◽  
M. J. Zwarts
Keyword(s):  
Conduction Velocity ◽  
Muscle Fiber ◽  
Tibialis Anterior Muscle ◽  
Maximum Voluntary Contraction ◽  
Isometric Exercise ◽  
Motor Units ◽  
Voluntary Contraction ◽  
Type I ◽  
Muscle Fiber Conduction Velocity ◽  
Depth Study

To obtain more insight into the changes in mean muscle fiber conduction velocity (MFCV) during sustained isometric exercise at relatively low contraction levels, we performed an in-depth study of the human tibialis anterior muscle by using multichannel surface electromyogram. The results show an increase in MFCV after an initial decrease of MFCV at 30 or 40% maximum voluntary contraction in all of the five subjects studied. With a peak velocity analysis, we calculated the distribution of conduction velocities of action potentials in the bipolar electromyogram signal. It shows two populations of peak velocities occurring simultaneously halfway through the exercise. The MFCV pattern implies the recruitment of two different populations of motor units. Because of the lowering of MFCV of the first activated population of motor units, the newly recruited second population of motor units becomes visible. It is most likely that the MFCV pattern can be ascribed to the fatiguing of already recruited predominantly type I motor units, followed by the recruitment of fresh, predominantly type II, motor units.

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