The chest protector standards take aim at a different problem: Every year, an estimated 10 to 20 people suffer what's called commotio cordis — cardiac arrest caused by a blow to the chest.

MotoGP rider Fabio Quartararo was penalized after the Catalunya GP for opening his racing suit and exposing his chest during the race. The Frenchman is the series point leader this season.

KANSAS CITY, Mo. — FOX 4 recently told you how chest protectors meant to protect young athletes from sudden cardiac arrest are not working. We’re now seeing researchers testing new designs to ...