The media learned on Thursday that a second-year student on the Yamagata Shogyo High School baseball team passed out during practices and died at the hospital.
According to school officials, the student was attending practices after school on the 16th. At around 7:30pm, he suddenly crouched down after running five 300-meter dashes and started convulsing. The manager began life-saving measures soon after and at 7:50pm, an adviser contacted emergency services.
The student was in cardiopulmonary arrest when rescue staff arrived at the scene. He died at the hospital at around 6:30pm on the 18th. The cause of death was a ventricular fibrillation caused by a dilated cardiomyopathy.
There were two AED devices on the school grounds, but none near the playing field (one was located near the school lobby and the other in the gym). The device was not used on the student at the time of the incident.
The baseball team was in the middle of a mini-camp that started on the 16th. It was canceled on the 17th. The student in question did not have any known chronic diseases and practices were not particularly grueling.
Source: Sponichi 6/19/2014