Subclinical...
Jeez louise...
...Subclinical myocarditis may be more common than thought. Christian Müller, director of the Cardiovascular Research Institute at University Hospital Basel, recently collected blood samples from almost 800 hospital workers 3 days after they got a COVID-19 booster. None met the criteria for myocarditis but 40 had high levels of troponin, a molecule that can indicate damage to the heart muscle...
The athletes in question had Covid, the disease, not the vaccine.
“Subclinical myocarditis, without specific symptoms, may be inferred by transient increases in troponin (a biomarker of cardiac damage) or ECG, which measures the electrical activity of the heart, after an acute viral illness, adverse drug reaction, or rarely vaccination.”
https://www.myocarditisfoundation.org/research-and-grants/faqs/types-of-myocarditis/