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.

正常受试者以不同的振幅靶标的收缩速率快速施加等轴测扭矩，并以不同的速率以恒定的靶标。在最快的收缩中，激动剂三头肌和拮抗剂二头肌肌肉显示出肌电射线的射线，其特征是慢波，最初的阴性和随后的正相。对于不同的目标幅度，每个相的持续时间相对恒定。在激动剂中，由负或正波形组成的区域随着目标振幅的增加而增加，并且与扭矩首次衍生物的峰值相关。拮抗剂齐射与目标振幅之间的关系在该区域的受试者和激动剂 - 抗逆邦射线的间隔之间有所不同。随着收缩率的降低，激动剂齐射与扭矩衍生物的峰值相关的区域下降，保留恒定持续时间，而拮抗剂凌空消失。这些结果表明，快速等距收缩是由激动剂激活的振幅调节脉冲控制的，这与拮抗剂激活脉冲有关，而拮抗剂激活的脉冲在受试者之间可变。

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。”