Racunica Tina L, Teichtahl Andrew J, Wang Yuanyuan, Wluka Anita E, English Dallas R, Giles Graham G, O'Sullivan Richard, Cicuttini Flavia M
Monash University, Alfred Hospital, Melbourne, Victoria, Australia.
Arthritis Rheum. 2007 Oct 15;57(7):1261-8. doi: 10.1002/art.22990.
It is unclear whether physical activity that is beneficial for the cardiovascular system is detrimental to knee structures. We examined the association between intensity, frequency, and duration of physical activity and knee structures in a community-based population.
A total of 297 healthy adults ages 50-79 years with no history of knee injury or disease were recruited from an existing study on healthy aging. Each subject underwent knee magnetic resonance imaging (MRI) to measure tibial cartilage volume, tibiofemoral cartilage defects, and bone marrow lesions. Physical activity and anthropometric data were obtained via questionnaire during 1990-1994 and 2003-2004.
Tibial cartilage volume increased with frequency (P = 0.01) and duration (P = 0.001) of vigorous activity (activity leading to diaphoresis or dyspnea) reported 10 years previously, as well as recent vigorous activity in the 7 days prior to MRI (P = 0.05). Recent weight-bearing vigorous activity increased with tibial cartilage volume (P = 0.02) and was inversely associated with cartilage defects (P = 0.02). A reduced risk of bone marrow lesions was associated with regular walking (P = 0.04).
Vigorous physical activity appears to have a beneficial effect on knee articular cartilage in healthy, community-based adults with no history of knee injury or disease. Regular walking reduces the risk of bone marrow lesions in the knee. This study provides further support for a beneficial effect of physical activity for diseases associated with aging and suggests that exercise that is good for the heart is also good for the knees.
对心血管系统有益的体育活动是否会对膝关节结构有害尚不清楚。我们在一个社区人群中研究了体育活动的强度、频率和持续时间与膝关节结构之间的关联。
从一项现有的关于健康老龄化的研究中招募了297名年龄在50 - 79岁之间、无膝关节损伤或疾病史的健康成年人。每位受试者均接受膝关节磁共振成像（MRI）检查，以测量胫骨软骨体积、胫股关节软骨缺损和骨髓损伤情况。通过问卷调查在1990 - 1994年以及2003 - 2004年期间获取体育活动和人体测量数据。
胫骨软骨体积随着10年前报告的剧烈活动（导致出汗或呼吸困难的活动）的频率（P = 0.01）和持续时间（P = 0.001）增加，以及MRI检查前7天内最近的剧烈活动增加（P = 0.05）。近期负重剧烈活动随着胫骨软骨体积增加（P = 0.02），且与软骨缺损呈负相关（P = 0.02）。规律行走与骨髓损伤风险降低相关（P = 0.04）。
剧烈体育活动似乎对无膝关节损伤或疾病史的健康社区成年人的膝关节关节软骨有有益影响。规律行走可降低膝关节骨髓损伤的风险。本研究为体育活动对与衰老相关疾病的有益作用提供了进一步支持，并表明对心脏有益的运动对膝盖也有益。
