Moderate to severe osteoarthritis affects more than 22 million American adults between the ages of 25 and 74 and knee osteoarthritis (OA) can lead to disability in daily activities.中度至重度骨关节炎的影响， 2200多万美国成年人的年龄介于25岁至74及膝盖骨关节炎（ oa ） ，可导致伤残，在日常活动。 Weakness in the quadriceps can be a risk factor for knee OA, but it may be the easiest one to prevent.疲弱的股四头肌可以是一个危险因素，膝骨关节炎，但它可能是最容易的一个，以防止。 Previous studies have rarely investigated whether quads strengthening exercises prevent or slow progression of knee OA or changes that are visible in X-rays.以往的研究已经很少调查是否quads加强演练防止或进展缓慢，膝骨关节炎或变化都是看得见，在x光检查。 None have used the highly standardized x-ray procedures employed in a new study published in the October 2006 issue of Arthritis Care & Research, which examined the effects of strength training on the incidence and progression of knee OA in older adults.没有人曾经使用高度标准化x射线程序受聘于一项新的研究发表在2006年10月发行的关节炎护理与研究，其中审查的影响力量训练对发病的进展和膝骨关节炎，在中老年人。

Led by Alan E. Mikesky, PhD, of Indiana University and Purdue University in Indianapolis, IN, researchers conducted a study of 221 patients divided into 4 groups (OA/pain, OA/no pain, no OA/pain, no OA/no pain) that were then randomly assigned to either a strength training (ST) program or a range-of-motion (ROM) regimen for 30 months. 率领由阿兰体育mikesky ，博士，印第安那大学和普渡大学在印第安纳波利斯，在研究者进行了一项研究， 221名患者分为4组（办公自动化/疼痛，骨关节炎/无疼痛，无骨关节炎/疼痛，没有办公自动化/无疼痛） ，然后随机分配到无论是力量训练（ st ）的节目或测距器的运动（只读存储器）的疗程为30个月。

The results showed that patients in both groups lost lower-extremity strength over 30 months, but the rate of loss was slower with ST than with ROM.结果表明，患者在这两个群体失去下肢实力超过30个月，但是，丧失的速度较慢，与圣比光盘。 In patients with OA at the beginning of the study, the average loss of joint space width as seen on X-rays was 37% less in the ST group than in the ROM group, although this was not considered to be significant.在病人与办公自动化在一开始的研究中，平均损失关节间隙宽度上看到的x光片为37 ％以下，在圣集团，比在光盘集团，尽管这并不被视为意义重大。 However, progression of joint space narrowing occurred less often in the ST group.然而，进展的关节空间缩小发生较少，往往在圣集团。 In addition, neither group showed a decrease in knee pain, although this is not particularly surprising in light of the fact that half of the patients did not have any knee pain when the study began.此外，既不组显示减少在没膝疼痛，虽然这是没有什么特别奇怪的，根据事实，即有一半的患者没有任何膝盖疼痛时，就开始研究。 Patients in the ST group did begin to show better function during the last six months of the trial.病人中，圣集团也开始表现出较好的功能，在过去的6个月内结案。

The researchers note that resistance exercise has consistently been shown to maintain or increase muscle mass, as well as improve strength.研究人员注意到，抵抗运动始终被证明是保持或增加肌肉质量，以及改善的力量。 “In light of several previous positive studies in this area, the present study’s failure to demonstrate gains in isokinetic quadriceps strength in the ST group is difficult to explain,” the authors state. "鉴于过去的几个实证研究，在这方面，本实验的失败表明，在收益等速股四头肌力量，在圣集团，是难以解释， "研究报告的作者状态。 One explanation might be that adherence to the exercise programs was only moderate during the first year, although it increased slightly during the remainder of the study.其中一个原因可能是：坚持以演习方案是只温和的第一年期间，虽略有增加，在其余的研究对象。 The fact that patients showed gains in isotonic strength (i.e. weight lifted with exercise machines such as leg presses) but not isokinetic strength (i.e. the speed at which weight is lifted) may have to do with the fact that isotonic strength was measured in a way that closely resembled the exercises patients were familiar with.事实表明，病人的收益在等渗强度（即体重解除与行使机器，如腿印刷机） ，但不等速肌力（即速度上的重量是解除） ，可能都与事实等渗强度测量方式我们紧紧地联系类似于演习患者熟悉。

Despite the lack of gains in isokinetic strength, a beneficial effect of strength training, namely less progressive joint space narrowing in the ST group, was suggested in the X-ray results.尽管缺乏上扬等速肌力，有利的影响力量训练，即较少累进关节空间缩小，在圣集团，有人提出，在x光的效果。 However, negative effects were also noted: in knees that were normal at the beginning of the study, joint space narrowing was more common in the ST group than the ROM group.不过，负面影响也指出：在膝盖这是正常的，在开始的研究中，关节间隙变窄较常见，在st组比光碟集团。 The authors do not believe, however, that strength training is harmful for adults without knee OA, citing other studies that have shown benefits from these types of exercises.作者们不相信，但是，力量训练是有害无成年人膝骨关节炎，引用其他研究曾表明其好处，从这些类型的演习。 “In any event,” they conclude, “this finding requires confirmation in future trials of resistance exercise programs for older adults, which should include serial standardized radiographic or MRI examination to monitor possible adverse effects of lower-extremity resistance on articular cartilage in the knee.” "无论如何， "他们得出结论， "这一调查结果证实，需要在今后的审判抵抗运动节目，为老年人，其中应包括对串行标准化射线或磁共振成像检查，以监控可能产生的不利影响下肢阻力对关节软骨在膝关节"

Article: “Effects of Strength Training on the Incidence and Progression of Knee Osteoarthritis,” Alan E. Mikesky, Steven A. Mazzuca, Kenneth D. Brandt, Susan M. Perkins, Teresa Damush, Kathleen A. Lane, Arthritis Care & Research, October 2006; (DOI: 10.1002/art.22245).文章说： "影响的力量训练对发病率及进展得膝盖关节炎， "阿兰体育mikesky ，潘国甲马祖卡，丁四勃兰特，苏珊米帕金斯，特里萨damush凯瑟琳甲里，关节炎护理与研究， 2006年10月; （内务部： 10.1002/art.22245 ） 。