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我们的心脏象一个昼夜不停的自动化唧筒,保证血液循环。脉搏就是心脏输出血液所引起动脉壁有规律的振动。一般健康的成年男子在安静时每分钟脉搏为60—80次,女子的脉搏一般要比男子快5—10次。脉搏也依年龄而不同。儿童的脉搏要比成年人快得多。例如,新生儿的脉搏每分钟为135—140次,一岁儿童为110次,12—14岁儿童约80次,而老年人的脉搏则比青年人略为减少,每分钟约为70次。科学家们断定,迷走神经中枢紧张性提高,是脉搏随年龄而减少的原因。
Our heart is like a non-stop automated pump to ensure blood circulation. Pulse is the regular vibration of the arterial wall caused by the output of blood from the heart. The average healthy adult man has a pulse of 60-80 beats per minute in quiet, and the pulse of a woman is generally 5-10 times faster than that of a man. Pulses also vary by age. Children’s pulse is much faster than adults. For example, the newborn’s pulse is 135-140 beats per minute, 110 in one-year-old children, and 80 in children aged 12-14. The pulse in the elderly is slightly lower than that in young people, and is about 70 beats per minute. The scientists concluded that the increased tension in the vagus nerve center is the reason that the pulse decreases with age.