"Jack Crowley was  when a baseball hit him in the chest and stopped his heart. The Long Island teen survived thanks to a police officer who grabbed a defibrillator and shocked his heart back into rhythm. A blow to the chest  one that hits at just the wrong spot at just the wrong time  can trigger deadly cardiac arrest http Fortunately its rare. But most victims are otherwise healthy kid athletes. And survival hinges on fast use of those heartzapping defibrillators that not every athletic league or school keeps near the playing fields. There soon may be another attempt at protection A U.S. organization that oversees athletic equipment has proposed the first performance standard for chest protectors to reduce the risk from those blows a step that could lead to updated gear. Nancy Crowley finds it hard to watch her three sportsloving sons games since Jacks scary nearmiss in a batting cage a year ago. She calls the latest move by the athletic industry overdue. You cannot live in a bubble acknowledged Crowley who helped lobby local athletic officials to improve access to defibrillators but wants more protection. If a standard has come along that they feel is going to protect them in some way Im thrilled.  Cardiac arrest when the heart abruptly stops beating is uncommon in young people especially athletes who presumably are in their prime. There are no good counts in kids athletics. Whatever the number  or whatever the cause  cardiac arrest is getting more attention from parents coaches and heart specialists who say deaths should be preventable. Indeed NCAA guidelines recently reported in the Journal of the American College of Cardiology say defibrillators should be kept in the immediate vicinity of high risk locations such as weight rooms basketball courts and ball fields. For younger students many states have laws encouraging or requiring defibrillators in schools but few specify athletic facilities according to the advocacy group Parent Heart Watch. The most frequent cause of cardiac arrest in a young athlete is an underlying structural problem of the heart such as a thickened heart muscle the problem often behind headlinemaking collapses of basketball players. The chest protector standards take aim at a different problem Every year an estimated  to  people suffer whats called commotio cordis  cardiac arrest caused by a blow to the chest. A voluntary registry that has collected information on more than  cases over two decades does show survival increasing in recent years thanks to more defibrillator access. The highest risk is to boys under  when the chest wall is still flexible not as sturdy as it will become by their s when such deaths hardly ever are reported. About a third of the time victims were wearing some form of chest protector when they collapsed showing at least some of todays equipment isnt enough said Dr. Mark Link a heart specialist at Tufts University Medical Center who spent more than a decade unraveling just how commotio cordis occurs. Links tests using young pigs as a model revealed that killer hits are those landing directly over the heart at about  miles an hour  and in the milliseconds between heartbeats. Armed with that science the National Operating Committee on Standards for Athletic Equipment or NOCSAE funded creation of a sort of crashtest dummy to prove what gear really reduces the risk and proposed the first standard for chest protectors used in baseball and lacrosse that aim to do so. The idea find materials that disperse the heartdamaging force of a blow without impeding players movements  whether theyre catchers or youngsters playing other positions who may wear shirtlike chest coverings under their uniforms. Guarding against commotio cordis may require a different design than standard foam that blocks a broken rib. Among the questions is how to integrate protection against both. The standard is expected to be completed in January only then could manufacturers label gear certified as meeting it. NOCSAEs recommendations often are adopted by sports governing bodies. Its not clear what such gear would cost. Already one company that uses militarygrade materials in sports equipment has developed some lightweight protection it expects to fit the bill. In March Links team published lab tests in the Journal of Clinical Sports Medicine suggesting a combination of foams and polymers used by Pennsylvaniabased Unequal Technologies is likely to be effective. The company which funded the research is producing chest protectors and heartcovering shirts that it plans to test against the final NOCSAE standard. If we can stop a bullet we can stop a ball said Unequal chief executive Rob Vito. Other manufacturers are traveling to NOCSAEs lab to learn to test products. Stan Jurga Jr. of AllStar Sporting Goods a Massachusettsbased manufacturer wonders if hell need to alter equipment aimed at professionals too because teens sometimes wear the adult sizes. Those are the realworld challenges said Jurga who also is pursuing a protective shirt. But he applauded the science saying the last thing anyone wants is a false sense of security."