由于髋关节炎、膝关节炎、脚踝关节炎和脚关节炎，大约五分之二的骨关节炎患者会变成残障人士。然而，结果表明，每天适度或剧烈活动10分钟左右，老年人的日常生活就会更轻松--每周大约一小时。

Participants who did get in an hour had an 85% reduced risk of walking too slowly to cross a street safely and around 45% reduced risk of having difficulty bathing or dressing.

每周锻炼一小时的受试者因为走路缓慢而无法安全过街的风险降低了85%，洗澡或穿衣的困难度降低了45%。

"We were very excited to see that the amount of activity that distinguished people who stayed independent from those who didn't was substantially less than the standard recommendation [150 minutes per week by the NHS]," said Professor Dunlop at Northwestern University, US.

美国西北大学邓洛普（Dunlop）教授说道："我们很兴奋的看到，区分受试者是否独立的运动量远低于标准建议量（英国国家医疗服务体系建议每周150分钟）。"

The team followed up the participants four years later and found that nearly a quarter of adults who weren't performing the weekly hour of exercise were walking too slowly to cross the street safely.

该研究团队在接下来的四年内对受试者进行了跟进，他们发现：对于每周未能达到一小时运动量的受试者而言，近四分之一受试者走路太慢，无法安全过街。

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