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Old 08-15-2011, 02:03 AM   #1
hoown7174
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Default 清晨不适宜锻炼健身

  中国人很勤奋,受“一日之计在于晨”的影响,光波炉厂家,大多数爱锻炼的人都有晨练的习惯,但是清晨并不是适宜的锻炼时间。
  首先来看看外界因素:
一是植物在夜间也吸氧,呼出二氧化碳,因此,树木多的地方,早晨集聚二氧化碳较多。
二是夜间逆温层出现较多,致使清晨空气不佳。在夜间,风速较小,近地面数百米的空中出现逆温层,大气处于稳 定状态,污染物滞留在地表上方,难以扩散。秋、冬、春三季,近地面逆温层使得空气污染物在早晨6点左右最不 易扩散。
三是寒冷刺激本身可诱发血管痉挛,光波炉批发,在原有病变基础上引发血管栓塞或梗死。
其次再来看看人体内在因素的情况:由于一夜没有或很少饮水,清晨血液粘稠,增加了血管堵塞的危险性;起床后 交感神经兴奋增高,光波炉厂家,心跳加快,心脏本身需要更多的血液;早晨9~10时还是一天中血压最高的时候,因而早晨是中风、梗死的好 发时间。医学上称之为“魔鬼时间”。
因此,中老年人,特别是具有心、脑血管病危险因素的人和心、脑血管病患者,不宜在早晨做较大运动量的体育锻 炼。早晨可做较轻量的锻炼,如做广播体操、打太极拳、舞剑、散步等。
那么,什么时候是适宜的锻炼时间?下午4~5时左右最佳,红外线光波炉,其次为晚饭后2~3小时。因为此时人体的适应能力和全身协调能力均较强,尤其是心率、血压都较稳定,最适 宜进行体育锻炼。从外界环境讲,此时植物进行了一天的光合作用,氧气含量比较充足,气温也比较适中,利于锻 炼。上班族如不能在下午锻炼,可在晚上9~10点左右锻炼。此时锻炼,可使大脑彻底放松,缓解精神紧张。晚 间锻炼还可消耗多摄入的热量,减少脂肪的储存。
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