S1 is the first heart sound that doctors can hear using a stethoscope. The vibrations that occur when the mitral and tricuspid valves in the heart close produce the S1 sound. There are two common ...

Paying attention to your heart rate when training can be an excellent way to monitor your intensity and performance. Not only can this help ensure you stay within the threshold to burn calories ...

Whether you use an armband or chest strap, add some smarts to your exercise and training routine with one of the top heart rate monitors we've tested. I'm PCMag's managing editor for consumer ...