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在中rrrrrrrrrn长距离跑的rrrrrrrrrn过程中，有一段rrrrrrrrrn时间身体感到特别rrrrrrrrrn难受，胸部发闷，呼吸困rrrrrrrrrn雅．四肢无力，步子发沉，不rrrrrrrrrn愿而继续跑下去rrrrrrrrrn等等，这种现象在生rrrrrrrrrn理学上称为“极点”。rrrrrrrrrn一、“极点”产生原因rrrrrrrrrn运动开始以后，运动员的骨rrrrrrrrrn骼、肌肉等运动器官马上进入紧张的rrrrrrrrrn活动状志，...
In the process of r r r r r r r r n running in long distance, there is A period of time the body felt special r r r r r r r r r n uncomfortable, bored of the chest , Breathing difficulties r r r r r r r r r n Ya. Limb weakness, the pace of hair sinking, do not want to continue to run down r r r r r r r r r n and so on, this phenomenon is called “pole” in physics. r r r r r r r r r n One, “pole ” causes r r r r r r r r n movement After the start, the athletes’ bones, muscles and other sports organs immediately entered the nervous r r r r r r r r r n activity log, ...