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在中长跑的测验或比赛后,往往有一些同学出现晕厥现象。轻者面色苍白、头昏、耳鸣、眼前发黑、呕吐等,重则手足发凉、血压降低、脉膊减弱、瞳孔缩小,甚至还出现更为严重的现象。这是一个值得重视的问题。晕厥产生的愿因晕厥产生的原因主要是大脑突然缺血造成的。人脑的需血量是心脏输出量的五分之一,若运动后立即站立不动,下肢毛细血管和静脉就失去肌肉收缩对它们的挤压作用,但心脏活动仍处在较高的水平上,加上血液本身的重力关系,造成大量血液积聚在下肢舒张的血管中,回心血量减少,造成大脑突然缺血,产生晕厥。有的则是平时缺乏锻炼,体质较差或带病参
In the long-distance race after the test or competition, there are often some students appear syncope. Light pale, dizziness, tinnitus, eyes black, vomiting, etc., while the hands and feet of cold, lower blood pressure, pulse weakening, miosis, and even more serious phenomenon. This is a problem that deserves attention. The cause of syncope is the main cause of sudden cerebral ischemia. Human brain blood volume is one-fifth of the cardiac output, if standing immediately after exercise, lower extremity capillaries and veins will lose muscle contraction of their extrusion, but the heart activity is still at a high level On the other hand, coupled with the gravitational relationship of the blood itself, a large amount of blood accumulates in the blood vessels of the lower extremities to reduce blood flow, resulting in sudden brain ischemia and syncope. Some are usually lack of exercise, poor constitution or sick ginseng