dystonia

dys.to.ni.a

n.（名词）
Abnormal tonicity of muscle, characterized by prolonged, repetitive muscle contractions that may cause twisting or jerking movements of the body or a body part.
肌张力不全，肌张力异常：肌肉张力异常，特征为长时间不断重复的肌肉收缩及并发的身体或肢体的抽筋与痉挛

【引伸】
dyston.ic