(单选题)
在中长跑运动开始后不久，运动者常感到呼吸困难、胸闷、头晕、心跳加快，肌肉酸软无力，动作不协调等反应，这是（ ）。
A.疲劳现象
B.极点现象
C.假稳定状态
D.进入工作状态
参考答案：B
参考解析：
训练不足及体适能状态较低的人，通常在运动开始后不久（特别是长跑运动），就会有两腿发软、全身乏力，呼吸困难等感觉。在运动生理学中，这种现象称为“极点”。故本题选B。
知识点：
(单选题)18.（ ）
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