A recent application called MyCalmBeat may help cut stress and improve mental concentration by helping people breathe slowly.
The application employs a heart rate monitor which spots a person's most favorable breathing rate. The user can then improve the heart rate to reduce stress levels.
"Normally people think of 65 beats per minute as a good resting heart rate. But we're not necessarily looking at heart rate. We're looking at the degree to which the space between consecutive heart beats varies. We know that for most people their resonant frequency is between 7.5 and 4.5 breaths per minute. The software maps your heart rate variability through each of those rates to find the breathing rate where it becomes maximized," researchers said.