Bjorn “the Iceman” Borg turned 65 at the weekend. His appearances on the tennis court may have wowed the world back in the day but it was his resting heart rate that intrigued me as an impressionable medical student. There is some dispute about just how low it was; 35 according to some reports, while Borg claimed that 50 was more typical. The advent of fitness trackers, pulse oximeters and home blood pressure machines means you can easily monitor your heart rate while doing everything from training for a marathon to sleeping at night. However, it is the resting rate during the day that I want to concentrate on because it

Source: The Times June 07, 2021 16:06 UTC