Increased Cardiac Stress in Non-Professional Marathon Runners

Popularity of Marathon Running and Health Implications

Recent research indicates that non-professional marathon runners experience heightened cardiac stress following long-distance races. Marathon running has surged in popularity, celebrated for its demanding nature and potential health benefits. However, there is ongoing debate regarding whether the risks associated with marathon running may outweigh the benefits, particularly for amateur participants.

Heart Attack Incidence in Marathon Runners

The likelihood of heart attacks among marathon runners is approximately one in every 100,000 participants. Nevertheless, a significant number of exercise-induced heart attacks occur during marathon events. A study conducted by researchers in Spain focused on the cardiac stress levels experienced by amateur marathon runners, with findings published in the journal Circulation, affiliated with the American Heart Association.

Study Design and Participant Information

The study involved 63 amateur runners who were grouped in threes and assigned to complete races of varying distances: a 10-kilometer race, a half marathon, or a full marathon. The runners were matched based on age, body composition, running experience, and a 10-year cardiovascular risk assessment.

Methodology for Assessing Cardiac Stress

Researchers collected blood samples from each runner before and 10 minutes after their race to evaluate cardiac biomarkers. These biomarkers, including troponin I, troponin T, NT-proBNP, creatine kinase-MB, creatine kinase-MM, and myoglobin, serve as indicators of heart muscle strain.

Research Findings on Cardiac Biomarkers

The study’s results revealed significantly elevated levels of cardiac troponin I and troponin T in amateur runners who completed a full marathon compared to those who ran shorter distances. In addition, other cardiac biomarkers, such as NT-proBNP, creatine kinase-MB, and myoglobin, also increased in correlation with longer running distances. This elevation was noted despite the extensive training that participants engaged in before their full marathon compared to the half marathon or 10-kilometer races.

Implications of Increased Cardiac Stress

These findings indicate a notable increase in cardiac stress among amateur marathon runners following long-distance races, particularly full marathons. While elevated cardiac biomarkers following marathon running do not necessarily imply heart dysfunction, they do indicate a greater level of strain on the heart. Further research involving a larger sample of amateur runners is necessary to assess the clinical implications of this increased cardiac stress.

References

Beatriz, L., Salinero, J.J., Gallo-Salazar, C., Areces, F., Ruiz-Vicente, D., Martinez, M., & DelCoso, J. (2018). Elevation of Cardiac Troponins After Endurance Running Competitions. Circulation. doi:10.1161/CIRCULATIONAHA.118.034655

Thacker, C. (2018, December 3). Running a marathon can increase cardiac strain in amateur runners. Retrieved December 4, 2018, from https://newsroom.heart.org/news/running-a-marathon-can-increase-cardiac-strain-in-amateur-runners?preview=0508