Paramedics were dispatched to Huntley High School after a 911 caller said someone went into cardiac arrest at the track at about 7:20 p.m.
The 16-year-old boy was tended to by an off-duty paramedic and school staff, fire officials said.
They used an Automated External Defibrillator, also known as an AED, while they waited for paramedics to arrive.
The boy was rushed to Northwestern Huntley Hospital. Officials said the boy was in stable condition.
No other information was available.
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