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【多选题】
以下关于运动性疾病的叙述正确的是A.
心脏功能存在问题时，长跑时心脏“打”不出血，会造成全身供血不足，导致死亡。
B.
剧烈运动时血液多集中在肢体肌肉中，由于肢体肌肉强力地收缩，会使大量的静脉血回不到心脏，血液循环极快。
C.
如果剧烈运动结束就坐下来休息，肢体中大量的静脉血淤积于静脉中，心脏就会缺血，容易造成心跳的骤停，从而导致猝死。
D.
长跑冲刺后不能立即停下来，要做一些缓冲的运动，可以减少运动性晕厥或猝死的发生。
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