不同提重负荷对躯干屈伸过程中下腰力学指标影响的研究

In this study，surface EMG signals from bilateral erector spine as well as kinematic variables of lumbar spine of 20 male adult subjects were recorded and analyzed synchronically during their performances of trunk flexion-extension with 7 different lift loads. The results showed that different lifting load has no effect on both inclination angle and flexion angle at the time of EMG-off or EMG-on ，and flexion relaxation phenomenon of erector spine either. With the increase of lifting load，the maximum low back moment，the low back moment at the time of EMG-off and that at the time of EMG-on be－ came significantly larger. In the load-sharing relationship，the passive tissue could not significantly get a compensation from muscular activation of erector spine，which is a highly risk situation of injury for passive tissues in low back area especially when lifting with a greater load.

Effect of Different Lifting Load on Biomechanical Variables of Lumbar Spine during Trunk Flexion-extension Performance