There was a clear heart rate pattern among those having cycles without hormonal contraception. Their resting heart rate decreased at the beginning of each menstrual cycle, reaching the lowest ...

Adults whose resting heart rate follows an atypical pattern as they age may face a greater risk for developing heart failure or dying from any cause than people whose heart rates follow a normal ...

An American baby, born prematurely after a heart block—a dangerous cardiac condition—was fitted with the world’s smallest ...