Danish researchers gave physical exams to 5,249 healthy middle-aged and elderly men beginning in 1971. In 1985 and 1986, they tracked survivors, of whom there were 3,354. Of these, 2,798 had sufficient data on heart rate and oxygen consumption for the analysis. Researchers followed them through 2011.
“If you have two healthy people,” said the lead author, Dr. Magnus Thorsten Jensen, a researcher at Copenhagen University Hospital Gentofte, “exactly the same in physical fitness, age, blood pressure and so on, the person with the highest resting heart rate is more likely to have a shorter life span.”