The Role of Prerotation of the Trunk in Axial Twisting Efforts
The Role of Prerotation of the Trunk in Axial Twisting Efforts
复制标题
躯干预旋转在轴向扭转作用中的作用
DOI：
10.1097/00007632-198712000-00016
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发表时间：
1987
期刊：
影响因子：
3
通讯作者：
C. Zetterberg
中科院分区：
文献类型：
--
作者：
M. Pope;M. Svensson;G. Andersson;H. Broman;C. Zetterberg
在受控等长轴向扭矩的发展过程中，记录选定的躯干肌肉的肌电活动。在L3水平测量双侧竖脊肌、腹直肌、腹外斜肌和腹内斜肌的肌肉活动。受试者首先应用分级等长扭矩努力超过10秒斜坡最大自愿收缩与躯干在中立旋转。然后，他们重复的努力与树干扭曲的左和右。最大的肌电图活动被发现在激动斜肌，但相当大的拮抗活性也存在。而活动的内斜肌和直肌是双边相似的对称站立的差异发生在两侧的躯干是扭曲的权利或左。躯干轴向预旋30°，在扭矩发展的方向略有减少最大发展扭矩，而在相反的方向预旋增加发展扭矩。
The myoelectric activity of selected trunk muscles was recorded during the development of controlled isometric axial torques. Muscle activity was measured bilaterally over the erector spinae, the rectus abdominus, the oblique external and the oblique internal abdominal muscles at the L3 level. Subjects first applied graded isometric torque efforts over a 10 second ramp up to maximum voluntary contraction with the trunk in neutral rotation. They then repeated the effort with the trunk twisted to the left and right. The largest electromyographic activities were found in the agonistic oblique muscles, but considerable antagonistic activity was present also. While the activity of the internal oblique and rectus were bilaterally similar in symmetric standing a difference occurred between the two sides when the trunk was twisted to the right or left. Axial prerotation of the trunk by 30° in the direction of torque development marginally decreased the maximal developed torque, whereas prerotation in the opposite direction increased the developed torque.