运动性猝死是指因为过量的运动导致死亡。对运动性猝死的定义是在运动中或运动后即刻出现症状，6小时内发生的非创伤性死亡。
病因多为心源性和脑源性猝死，冠状动脉粥样硬化是运动性猝死的一个主要原因。
Most of the etiological factors are sudden cardiac death and sudden cerebral death, and coronary atherosclerosis is one of the main causes for exercise-related sudden death.
结论：运动训练可明显提高安静时心率变异性，提高心迷走神经张力，减低心脏性猝死的可能性。
CONCLUSION: Exercises can improve obviously heart rate variability in rest, increase tone of cardiac vagus nerve and decrease the capability of cardiac sudden death.
跑步会使你的后半生变成残疾，你可能猝死在跑马拉松的途中等等作一为名跑步的爱好者，关于跑步这项运动的这些说法的真实性，我存在很多疑问。
It will cripple you in your later years; you might drop dead in the middle of a marathon; and on and on. As an avid runner, I have a lot riding on whether or not these ideas about the sport are true.
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