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本研究目的是确定在不同水平等长随意收缩时兴奋沿肌纤维传导的速度与运动单位(MUs)募集阈之间关系。 方法 受试者坐在扶手椅上,前臂固定于掌心向上姿势,肘关节成90°角,腕关节固定在坚硬支撑物上。张力计安装在同一支撑物上测定肌力。MU出现第一个冲动时的肌力为募集阈,用最大随意收缩(MVC)的百分率表示。为选出单个MU电位,将皮下分支线电极经皮插入,尽量贴近肌筋膜。为确定传导速度而使用浅表多极电极由两个单极电极组成,其末端面积为1mm~2,安装在同一绝缘板上,相距10mm。参考电极为50mm~2圆形金属板置于前臂远
The purpose of this study was to determine the relationship between the rate of excitement along the muscle fibers and recruitment threshold of motor units (MUs) at varying levels of voluntary contraction. METHODS Subjects were seated in an armchair with their forearms fixed in the upward palm position, with the elbow at a 90 ° angle and the wrist fixed on a hard support. Tension meter installed on the same support measured muscle strength. Muscle strength at the time of MU’s first impulse was the recruitment threshold, expressed as the percentage of maximal voluntary contraction (MVC). To select a single MU potential, the subcutaneous branch line electrodes percutaneous insertion, as close to the myofascial. For determination of conduction velocity, the superficial multipole electrode consists of two monopolar electrodes with terminal areas of 1 mm to 2 and mounted on the same insulating plate 10 mm apart. Reference electrode is 50mm ~ 2 round metal plate placed in the forearm is far