末梢神経刺激誘発筋電図法による脊髄通電効果の検討

Studies on the Effect of Electric Current on the Spinal Cord by Means of Evoked EMG Method Stimulating the Peipheral Nerve

緒言

　最近末梢神経に電気刺激を加え，その支配筋の所謂誘発筋電図を観察するゆき方が，単に末梢神経ないし筋機能の観察方法としてのみならず，中枢性運動機序の解明方法としても重要視されるようになつた。

　例えばMagladery等^1-3）が1950年以降人間を対象として，主としてN．tibialisに電気刺激を加え，M．gastrocnemiusから現われる脊髄反射性の誘発筋電図，所謂H波の諸性質を明らかにすると共に，中枢運動障害患者における特異性を指摘したこと等はその著しい例である。

Sixteen normal men and forty-six decorti-cated cats used in these experiments. Mono-polar cathodal shocks of 1 msec., duration were applied though the intact skin to the posterior tibial nerve behind the knee, depen-dent on the nature of the experiment.

Muscle action potentials were led to ampli-fiers and two beams cathod ray osciloscope through paired surface electrodes fixed to the skin overlying the gastrocnemius muscle.

The effect of current applied on the spinal cord was changed by various strengths cur-rent, using the H and M waves.

1. The occurrance of H wave was depend-ent upon four kinds of musoles. In all cases Of gastrocnemious muscle stimulated by tibial nerve and rectus femoral muscle sti-mulated by femoral nerve, H wave was reco-rded, but in the other cases H wave was not alway recorded individually.

2. The H wave was recorded in all cases of gastracnemius muscles stimulated by tibial nerves in infants and children.

3. The current was applied to spinal cord with the following effects on the H wave.