Muscle spasticity

Japanese: 筋痙縮 - きんけいしゅく(英語表記)muscle spasticity
Muscle spasticity
A state of increased muscle tone. In muscle spasms, the muscles of the limbs are usually relaxed at rest, but when you try to passively stretch the muscles, you feel resistance (this is due to the stretch reflex), and as you increase the speed of stretching, the resistance increases accordingly. In other words, the stretch reflex is in an increased state. A typical example is the clasp knife phenomenon, where the resistance suddenly disappears when it reaches a certain level.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
筋緊張(筋トーヌス)の亢進した状態の一つ。筋痙縮では,安静時には四肢の筋肉はふつう弛緩した状態にあるが,他動的に筋肉を伸ばそうとすると抵抗を感じ(これは伸展反射stretch reflexによる),さらに伸展速度を増すとそれに伴って抵抗が強まる。つまり伸展反射の亢進した状態になっている。典型的な例では,ある程度抵抗が強くなったところで急激に抵抗がなくなる〈折りたたみナイフ現象clasp knife phenomenon〉がみられる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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