Pulse Control during Rapid Isometric Contractions of the Elbow Joint

肘关节快速等长收缩期间的脉冲控制

• 批准号: 04680123
• 负责人: YAMAZAKI Yoshihiko
• 金额: $ 1.09万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04680123/
• 关键词: Rapid Contraction; Isometric contraction; Elbow joint; Monopolar surface EMG; Human.; 表面筋電図; 単極導出法; ヒト; 単極導大法

Normal subjects exerted isometric torque at a rapid rate of contraction with different amplitude targets, and at different rates with a constant target. In the fastest contractions, the agonist triceps and antagonist biceps muscles showed an electromyographic volley characterized by a slow wave with an initial negative and subsequent positive phases. The duration of each phase was relatively constant for different target amplitudes. In the agonist, the area comprised by the negative or positive waveform increased with increasing target amplitude and correlated with the peak of the first time derivative of torque. The relationship of the antagonist volley to the target amplitude varied among subjects both in the area and the interval of the agonist-antagonist volley. With a decreasing contraction rate, the agonist volley decreased in the area in correlation with the peak of the torque derivative, retaining a constant duration, while the antagonist volley disappeared. These results suggest that rapid isometric contractions are controlled by an amplitude-modulated pulse of agonist activation, which is associated with a pulse of antagonist activation, while the pulse of the antagonist activation is variably utilized among subjects.

正常受试者在不同幅度目标下以快速收缩速度施加等长扭矩，在固定目标下以不同速率施加等长扭矩。在最快的收缩中，激动型三头肌和拮抗型二头肌表现出一种肌电截击，特征是以慢波为特征，最初为负相，随后为正相。对于不同的靶点幅度，每个阶段的持续时间相对恒定。在激动剂中，负波或正波的面积随靶波幅的增大而增大，并与扭矩一次导数的峰值相关。不同受试者的对抗性截击与靶点幅度的关系，无论是在激动者-拮抗者截击的区域还是间隔上都不同。随着收缩速率的降低，激励性截击与扭矩导数峰值相关地减少，并保持恒定的持续时间，而拮抗性截击消失。这些结果表明，快速等长收缩是由激动剂激活的幅度调制脉冲控制的，而激动剂激活的脉冲与拮抗剂激活的脉冲有关，而拮抗剂激活的脉冲在不同受试者之间是不同的。

项目成果

YOSHIHIKO YAMAZAKI: "Pulse Control during Rapid Isometric Contractions of the Elbow Joint" Brain Research Bulletin. (Accepted).

YOSHIHIKO YAMAZAKI：“肘关节快速等长收缩期间的脉冲控制”大脑研究通报。

YOSHIHIKO YAMAZAKI: "An electromyographic volley at initiation of rapid isometric contractions of the elbow" Brain Research Bulletin. 30. 181-187 (1993)

YOSHIHIKO YAMAZAKI：“肘部快速等长收缩开始时的肌电图齐射”《大脑研究通报》。

YOSHIHIKO YAMAZAKI: "An electromyographic volley at initiation of rapid isometric contractions of the elbow." Brain Research Bulletin. Vol.30. 181-187 (1993)

YOSHIHIKO YAMAZAKI：“肘部快速等长收缩开始时的肌电图齐射。”