论文部分内容阅读
体育锻炼确实可以增强人的免疫力,但只有运动量适中时才能达到。越来越多的证据表明,过量的运动可以增加受伤的机会。以拉尔夫·刘易斯为例。他几年前即已退役。当时他一周之内坚持游泳几次。在沃蒙特,他又转向滑雪,很快就增大运动量,每天坚持滑24公里。刘易斯从每天的外出锻炼中心理上得到很大补偿。他回忆说:“即使髋部疼痛时,我也坚持,那怕是阴雪天。”但后来他弯不下腰来,连鞋带都不能系。医学检查发现,他患有骨关节炎,为运动量过太所致,最后彻底毁了髋部。目前,经过2次置换骨架手术和几个月的治疗,刘易斯每周只能在村庄周围的绿茵上一拐一瘸地进行3次慢行。目前,大约有15—25％的成年
Physical exercise can indeed enhance human immunity, but only moderate exercise can be achieved. More and more evidence shows that excessive exercise can increase the chances of injury. Take Ralph Lewis as an example. He retired a few years ago. At that time he insisted on swimming a few times a week. In Waumonte, he turned to skiing and soon increased his physical activity, skiing 24 kilometers a day. Lewis gets a lot of compensation from everyday exercise. He recalled: “Even in the pain of the hip, I insisted, even overcast and snowy.” But then he bent over, not even the shoelace. Medical examination found that he suffered from osteoarthritis, exercise too much, eventually ruined the hip. Currently, after two replacement skeleton operations and several months of treatment, Lewis can only walk slowly three times a week on the green around the village. At present, there are about 15-25% of adults