Heart inflammation is uncommon in pro athletes who’ve had mostly mild COVID-19 and most don’t need to be sidelined, a study conducted by major professional sports leagues suggests. The results are not definitive, outside experts say, and more independent research is needed. …The research involved professional athletes in the U.S. and Canada who play in major league football, hockey, soccer, baseball and men’s and women’s basketball. All tested positive for COVID-19 before October and were given guideline-recommended heart tests, nearly 800 total.