As a stimulant, caffeine jazzes up your whole body, increasing blood pressure, heart rate and in some cases, causing heart palpitations and an irregular heartbeat.
2
这整个心跳过程的任何一个环节出了问题，都会导致心律不齐。
A problem with any part of this process can cause an arrhythmia.
People who start exercising at the age of 70 are less likely to go on to develop a condition that leads to irregular or racing heart rates in 10 per cent of people aged over 80.
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