ヒトの随意運動中にみられる筋活動電位の抑制現象に関する研究

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書誌事項

タイトル別名
  • Mechanism of the Electrical Silence Caused by the Sudden Unloading during Voluntary Muscle Contraction in Man
  • ヒトの随意運動中にみられる筋活動電位の抑制現象に関する研究-1-急速負荷解放に伴う活動電位休止の機構
  • ヒト ノ ズイイ ウンドウチュウ ニ ミラレル キン カツドウ デンイ ノ ヨ
  • 第I報急速負荷解放に伴う活動電位休止の機構

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抄録

The mechanism of the electrical silence caused by the sudden unloading during voluntary isometric contraction in normal man, was investigated in terms of the unloading latencies of the Brachialis (BA), the Brachioradialis (BR), the Vastus medialis (VM), and the Vastus lateralis (VL) compared with the stretch reflex latencies of the same muscles.<BR>Healthy adult males were seated with the elbow or the knee joint kept at 90 degrees. A load was applied isometrically via a chain at the wrist joint in elbow flexion and at the ankle joint in knee extension. The applied loads were in a range from 20 to 60%of the maximal strength exerted in elbow flexion or knee extension. The load could be released instantaneously by cutting a connecting loop in the chain and the tension change, the angular displacement of the joint, and the electromyograms of the BA and BR in elbow flexion and at the VM and VL in knee extension were recorded simultaneously via surface electrodes,10 mm in diameter with an electromagnetic oscillograph with a paper speed of 400 mm/sec. Under identical recording conditions the latencies of the stretch reflex in the same muscles for the same postures were measured.<BR>The following results were obtained.<BR>1. The unloading latency gave larger values than the stretch latency of the same subject and muscle under the same preload condition.<BR>2. The unloading latencies of the VM and VL were markedly larger than those of the BA and BR.<BR>3. The unloading latency was not affected by changes in the angular velocity of the joint movement after the sudden unlaoding.<BR>4. The electrical discharge pattern appearing between the time of mechanical load release and complete electrical silence varied widely.<BR>5. These findings strongly suggest that after sudden unloading polysynaptic spinal and/or supraspinal pathways can contribute to the latency of the electrical silenc e in the EMG under such conditions.

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