Walking ≥ 6000 steps/day provides a preliminary estimate of the level of walking activity to protect against developing functional limitation in people with or at risk of knee osteoarthritis (OA). Furthermore, the observational study in the US found among 1788 participants (mean age 67, mean BMI 31 kg/m2, female 60%), each additional 1000 steps/day was associated with a 16% and 18% reduction in incident functional limitation by performance-based and self-report measures, respectively. There is also support that strength training and aerobic exercise improve physical function in knee OA. Source: http://onlinelibrary.wiley.com/据初步估计对患有或存在膝关节骨关节炎（OA）风险的人每天散步≥6000步的活动水平可以防止发生功能受限。而且，该项在美国的观察性研究基于临床表现和自我报告发现在1788名参与者中（平均67岁，平均体重指数31，女性60％），每增加1000步/天，事故性功能受限分别减少16％及18％。已有证据支持力量训练和有氧运动改善OA的身体机能。来源：http://onlinelibrary.wiley.com/
