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想打哈欠别硬憋 强行抑制对健康不利

2015-9-28 19:17| 发布者: steven| 查看: 17319| 评论: 270|原作者: steven


  上班、开会、听课时,或者在其他公共场合,犯困了总想打哈欠,但出于礼貌不敢张大嘴,不得不把哈欠硬生生地憋着。其实,打哈欠是一种积极的生理现象,强行抑制虽然挽住了形象,却对健康不利。
  研究表明,一次打哈欠的时间大约为6秒钟,在这期间人会闭目塞听,全身神经、肌肉得到完全放松。人体通过哈欠的深呼吸运动,促使血液中氧气含量增加,排出更多的二氧化碳,从而使人精力更加充沛。打哈欠的动作还有助于增进呼吸,增强头颅、胸腔等身体部位的肌肉活动能力。睡眠不足或劳累过度时,会接二连三地打哈欠,这是警告人们大脑和各器官已经疲劳,要我们赶快睡觉,得到休息。早晨起床后往往也哈欠不止,这可以促进大脑皮层的各个功能区由抑制状态转为兴奋状态。生活小常识
  如果强行忍住打哈欠,可能对身体不利。因为此时人体产生大量的二氧化碳,平静呼吸不能把二氧化碳及时排出,如果再人为地抑制哈欠,就会导致过多的二氧化碳累积,引起胸腔沉闷,身体各器官更加疲劳。脑细胞缺氧情况无法及时改善,人体的应激能力也会变差。
  如果怕大庭广众之下有失雅观,只需在打哈欠时微微侧身,朝向无人的一侧,以手掩口即可。如果想更加提神,还可以在打完哈欠后再做几个深呼吸,有助于彻底呼出废气,吸入更多氧气,使精神加倍。

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