72 beats per minute is considered to be a normal rate of heart beats. It can also range from 60 to 100 while a person is resting. If the heartbeat crosses these numbers on either side, one must get themselves checked. Generally, these beats are regular and they follow a rhythm. People who are trained can predict when the next one. When the heart is beating irregularly, it can lead to certain heart conditions.
When it reaches over 140 beats per minute, it may be due to a problem known as atrial fibrillation. This abnormally high speed makes it difficult to predict the rhythm as the rate may be irregular.
