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运动需消耗能量,而人体生物钟提示的能量代谢规律表明,早晨是肝脏中糖元含量的低谷。这样,空腹运动所需能量只能靠脂肪分解提供。脂肪分解时产生的游离脂肪酸必然使血脂升高。游离脂肪酸对心脏的毒性可致产生各种心律失常,甚至引起致命的心源性休克。另外,人的血液在早晨最粘稠,流动时阻力大,流速慢,容易使心、脑缺血,并易凝固成血块,引起脑梗塞或心肌梗塞。运动时血流加速,能量消耗大,有猝发心脑疾病的危险。清晨人从平卧位改为直立位,运动时血压过快升高,对还未从“朦胧”状态苏醒的心血管增加了压力,容易发生意外。所以,有心脑血管病的中老年人不宜“闻鸡起舞”。
Exercise need to consume energy, and the body’s biological clock suggests that the law of energy metabolism that the morning is the lows of liver glycogen content. In this way, the energy required for fasting exercise can only be provided by lipolysis. Free fatty acids produced during lipolysis will inevitably increase blood lipids. Free fatty acids on the heart of the toxicity can cause a variety of arrhythmias, and even cause fatal cardiogenic shock. In addition, the most viscous of human blood in the morning, flow resistance, flow slow, easy to make the heart and brain ischemia, and easy to coagulate into blood clots, causing cerebral infarction or myocardial infarction. Exercise accelerated blood flow, energy consumption, the risk of sudden heart and brain disease. Early morning people from the supine position to orthostatic position, exercise, excessive rapid increase in blood pressure, has not yet recovered from the “hazy” state of the cardiovascular pressure, prone to accidents. Therefore, the elderly with cardiovascular disease should not “smell chicken dance.”