Optimal frequency of muscle vibration for motoneuron firing (脳と神経の研究-4-(特集))

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Forced vibration of muscle has been known to evoke the group la (GIa) discharges in the relevant dorsal afferents and it is also known that they can sometimes fire at the frequency as high as 350c/s-400c/s and that the discharge rate was just at the same frequency as that of the applied vibration if the tip of vibrator was placed close enough to the primary ending which is under observation (Granit & Henatsch, 1956; Bessou & Laporte, 1962; Bianconi & van der Meulen, 1963). These spindle discharges are transmitted monosynaptically to motoneurons, excite them and eventually drive them to fire repetitively. When the rate of vibratory stimulus is relatively low enough, motoneurones usually fire exactly at the same frequency as that of the applied vibration. However, once the vibratory frequency exceeds a certain rate, the exact correspondence of motoneuronal firing rate to the applied vibration disappears. They can not fire exactly corresponding beyond some frequency but do fire at some constant rate which is usually lower than, and at the same time, independent from, the rate of vibration applied. If we take the minimum amplitude (displacement) of vibration which is found necessary and enough to evoke the repetitive motoneuronal firing at some pre-determined rate, the value of this minimum displacement may differ along the parameter of vibratory frequency. This has been our main interest during our research described here. The relation between the minimum amplitude and the rate of vibration is studied and discussed in this paper.
千葉大学の論文

Optimal frequency of muscle vibration for motoneuron firing (脳と神経の研究-4-(特集))

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