Two Runners Die of Suspected Heart Attacks During Indonesian Ultra-Marathon
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A tragic incident unfolded during the Siksorogo Lawu Ultra in Karanganyar, Indonesia, on Sunday, December 7, 2025, claiming the lives of two participants – Pujo Buntoro, 55, and Sigit Joko Purnomo, 45 – during the 15-kilometer race. The deaths have prompted renewed discussion about the risks of sudden cardiac arrest during strenuous exercise, even among seemingly healthy individuals.
Race Conditions and Initial Reports
According to reports from the Karanganyar Police, authorities were alerted to runners found unconscious along the route. Sigit Joko Purnomo was discovered unresponsive on Mitis Hill, near the 12-kilometer mark, while Pujo Buntoro was found at Bukit Cemoro Wayang, around kilometer 8. A police spokesperson stated that the initial reports came in at 10:44 and 11:30 WIB, respectively, indicating the incidents occurred in close proximity. Heavy rainfall was reported at the time of the incident on Mitis Hill, potentially contributing to challenging conditions for the runners.
Confirmed Cause of Death: Heart Attacks
Tony Harmoko, a trustee of the Siksorogo Lawu Ultra 2025, confirmed that both runners succumbed to heart attacks. “Yes, it’s true, two people died of heart attacks. Mr. Pujo this morning at 10:11 WIB at kilometer 8,” Harmoko said when contacted by media. Organizers immediately initiated evacuation procedures, directing both runners to Karanganyar Regional Hospitals.
The Risk of Exercise-Induced Cardiac Arrest
The tragic events have brought to the forefront the potential for sudden death due to cardiac arrest during physical activity. A leading cardiologist, Dr. dr M Yamin, SpJP (K), SpPD, FACC, FSCAI, FAPHRS, FHRS, from BraveHeart – Brawijaya Hospital Saharjo, previously explained that this risk exists for anyone, even dedicated athletes. However, Dr. Yamin emphasized that such incidents often occur in individuals with pre-existing, often undiagnosed, heart conditions.
“Sudden death can occur in athletes,” Dr. Yamin stated. “It could be due to a heart attack, it could also be if they don’t have a blockage or heart attack, but because of an electrical abnormality in the heart.”
Hypertrophic Cardiomyopathy and Electrical Abnormalities
Dr. Yamin highlighted hypertrophic cardiomyopathy as a potential trigger for these electrical abnormalities. This genetic condition causes the heart muscle to become abnormally thick. When individuals with this condition engage in intense exercise, the thickened muscle can create a risk of an “electrical short circuit,” potentially leading to sudden cardiac arrest.
This underscores the importance of comprehensive cardiac screenings for individuals participating in strenuous athletic events. While the Siksorogo Lawu Ultra did not specify mandatory screenings, the incident raises questions about preventative measures that could be implemented in future races.
The deaths of Pujo Buntoro and Sigit Joko Purnomo serve as a somber reminder of the inherent risks associated with pushing the body to its limits and the critical need for awareness and proactive cardiac health management.
