一、饭后或空腹时不宜游泳。饭后游泳,大量血液流到四肢肌肉,肠胃道血液供应随之减少,影响食物消化。二、剧烈运动后不要马上游泳。剧烈运动后体温上升,如立即下水游泳,易引起感冒或抽筋。三、切忌有水就游和随便下水。初学者和不了解水情者,绝不可随便跳进水中就游,否则容易出事。 First, after a meal or fasting should not swim. After dinner swimming, a large number of blood flow to the limbs, gastrointestinal blood supply decreases, affecting food digestion. Second, do not swine immediately after strenuous exercise. After strenuous exercise, body temperature rises, such as immediately launched into the water, easy to cause a cold or cramps. Third, avoid swimming on the water and casually launching. Beginners and those who do not understand Hydrology, must not jump into the water on the tour, otherwise easy to accident.