Kumar S
Department of Physical Therapy, University of Alberta, Edmonton, Canada.
Spine (Phila Pa 1976). 1997 Oct 1;22(19):2213-21. doi: 10.1097/00007632-199710010-00004.
To determine the trunk-twisting capability from neutral and prerotated postures, a study was designed to measure torque generated in isometric and isokinetic activities of 50 young adults.
To determine the isometric and isokinetic axial rotation strengths of male and female subjects in neutral and asymmetric postures and to quantify the effect of velocity of rotation on the isokinetic trunk strength profile.
A specially designed axial rotation tester was employed using specially written modular software for data collection and analysis. The isometric strengths were measured in neutral, 15 degrees, and 30 degrees prerotated trunk postures. The isokinetic strength was measured in activities starting from the neutral position to fully rotated and from a fully rotated position to neutral positions at 10 degrees, 20 degrees, and 40 degrees per second angular velocity. The data obtained were subjected to multivariate and univariate analyses of variances with multiple comparisons and multiple regression analyses.
All study participants were significantly stronger in isometric twisting activities than in the isokinetic activities. In isometric activities, participants were 20-25% weaker in prerotated postures when twisting in the direction of prerotation and were approximately 30% stronger in the opposite direction. For isokinetic activities, the trunk rotation from neutral to asymmetric positions produced lesser torques compared with torques from rotated positions to the neutral position. The torque-producing capability declined with increasing velocity of activity.
This study adds to the data base of rotational strength.
为了确定从中立姿势和预旋转姿势开始的躯干扭转能力，设计了一项研究来测量50名年轻成年人在等长和等速活动中产生的扭矩。
确定男性和女性受试者在中立和不对称姿势下的等长和等速轴向旋转力量，并量化旋转速度对等速躯干力量曲线的影响。
使用专门设计的轴向旋转测试仪，并采用专门编写的模块化软件进行数据收集和分析。在中立、预旋转15度和30度的躯干姿势下测量等长力量。在从中立位置开始到完全旋转以及从完全旋转位置到中立位置的活动中，以每秒10度、20度和40度的角速度测量等速力量。对获得的数据进行多变量和单变量方差分析，并进行多重比较和多元回归分析。
所有研究参与者在等长扭转活动中的力量明显强于等速活动。在等长活动中，参与者在沿预旋转方向扭转时，预旋转姿势下的力量比中立姿势弱20 - 25%，而在相反方向扭转时则强约30%。对于等速活动，从中立位置到不对称位置的躯干旋转产生的扭矩小于从旋转位置到中立位置产生的扭矩。扭矩产生能力随着活动速度的增加而下降。
本研究增加了旋转力量的数据库。
