Variability in heart beat keeps the body in balance

22 septiembre 2014

Although the heart beats out a very familiar ‘lub-dub’ pattern that speeds up or slows down as our activity increases or decreases, the pattern itself isn’t as regular as you might think. In fact, the amount of time between heartbeats can vary even at a ‘constant’ heart rate — and that variability, doctors have found, is a good thing.