Objectie . the purpose was to ealuate the influence of pain distribution on ertical grf of patients with low back problems during 2 walking speed conditions : preferred and fastest speeds 研究设计：通过对只有背部疼痛组，背部疼痛并牵扯到腿部组，及正常对照组3个性别年龄相匹配组进行两种步行速度的对比，来横向分析垂直地面反应力。
2.
New york - - the yankees aren ' t panicking over randy johnson ' s lower back problems yet - - he still has a week of recovery time to prepare for next friday ' s start in game 3 of the american league division series - - but they acknowledge that the big unit needs to show significant progress soon 洋基队对于巨怪的背伤并不惊恐，他有一个礼拜的时间可以准备下周五美联季后赛第三场的先发，但次他们承认巨怪很快的就会进行练投的工作。
