Warning to weekend warriors: Swim-bike-run triathlons pose at least twice the risk of sudden death as marathons do, the first study of these competitions has found. The risk is mostly from heart problems during the swimming part. And while that risk is low — about 15 out ...

Turning your clock back on Sunday may be good for your heart. Swedish researchers looked at 20 years of records and discovered that the number of heart attacks dipped on the Monday after clocks were set back an hour, possibly because people got an extra ...