The hardest working muscle in an NBA player’s body will get extra attention if there is a COVID-19 positive test. NBA officials and teams will play close attention to a player’s heart. Before a player returns from a positive test, he must satisfy specific requirements: isolation period, absence of symptoms, two negative tests at least 24 hours apart and cardiac screening. Why cardiac screening? “The concern is really an extension of what all of the professional teams are doing already, and that’s protecting their athletes from cardiac events more so than they have in the last five years or so,” cardiologist Matthew Martinez told USA TODAY Sports. “That extension now is with COVID-19 because initial reports said this had a high prevalence of involving hospitalized patients. Those were sicker patients and about 30% were reported to have cardiac involvement. That was what really tipped things off.”