正常生理状态下斜扳，后伸位应力大于前屈位而小于自然中立位。
Under normal physiologic condition, the stress in posterior extension is greater than that in anterior flexion, but less than in neutral position.
方法采用脊柱活动节段的三维有限元模型分析了脊柱在直立位、前屈位和后伸位的应力分布情况。
Methods Stress distribution of the spine in the upright, flexion and extension positions was analyzed using a three-dimensional finite element model of the spinal motion segment.
假设你是一位身体柔软的瑜伽老师，某天清晨，你正在舒展下肢，为待会要在课堂上示范的深度前屈做准备。
Say that you're a flexible yoga teacher. Each day you wake up and practice hamstring stretches, then demonstrate deep forward bends in your classes.
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