体育锻炼能增强抵抗力。但据香港《大公报》5月13日报道，香港医学专家指出，为了抵抗疾病，突然增加运动量和运动频率，反而会增加染病几率。
香港大学医学院社会医学系与微生物学系的研究人员进行了此项调查。
他们研究了1998年—2008年间香港24650名30岁以上死亡者的信息，调查了这些人死亡前10年的运动习惯。结果发现，每月坚持运动1—3次的人，患流感等传染疾病的可能性明显要低。而那些平时不运动、突然将运动量增加到每周4次以上的人，因传染疾病死亡的几率高出约6%。研究人员表示，过于频繁的运动次数和突然增加的运动量，会削弱人体免疫功能，增加感染疾病的风险。
研究人员建议，没有或很少做运动的人，应养成维持适量运动的习惯，避免在疾病流行期间突然增加运动量。“每周进行3次适量的体育运动即可增加抵抗力，运动后要注意休息。”
译文:
Hong Kong medical experts pointed out: a sudden increase in the amount of exercise will lead to easier sickness
Physical exercise can enhance immunity. However, according to Hong Kong's "Ta Kung Newspaper" May 13, Hong Kong Medical experts pointed out that in order to resist diseases, sudden increase of physical activity and exercise frequency will increase the risk of getting disease.
The researchers from the Department of Social Medical Science and the Department of Microbiology of Hong Kong University conducted the survey.
They invested 24,650 people in Hong Kong who died over the age of 30 years old during the period from 1998 to 2008. They studied the information about the exercise habit they owned ten years before they die. The results showed that the possibility of suffering from influenza and other infectious diseases of those who adhered to the 1-3 times of exercise a month is significantly lower. As to those who do not exercise frequently but suddenly increased their exercise amount up to over four times a week, the risk of dying of infectious disease for them is about 6 percent higher. The researchers said that too much frequent sports and a sudden increase in the amount of the exercise would weaken the body's immune function and increase the risk of infection.
The researchers suggested that those who exercise very little should cultivate the habit of regular exercise and avoid sudden increase in exercise during the period of disease prevalence "Exercise three times a week is enough to strengthen the resistance and a good rest after exercise is needed.”