If you can run 42km, does that mean your heart is definitely healthy???

Many people assume that 'being able to run 42km means your heart is definitely healthy,' but good endurance doesn't equate to the absence of heart disease. A common scenario for sudden cardiac death related to marathons is when a pre-existing, hidden heart condition is triggered by strenuous exercise, leading to fatal arrhythmias. In such cases, the heart might be beating erratically but is unable to pump blood effectively, causing insufficient blood supply to the brain. The individual may rapidly lose consciousness and collapse. This isn't simply exhaustion; it's the heart suddenly failing to maintain circulation. During running, your heart rate increases, and the heart requires more oxygen. If the coronary arteries supplying the heart are narrowed, or if plaques within the vessels rupture and form blood clots, it can lead to myocardial ischemia, myocardial infarction, or even fatal arrhythmias. Furthermore, certain cardiomyopathies, hypertrophic cardiomyopathy, or congenital cardiac electrical abnormalities might not show obvious symptoms during normal times. However, during intense exercise, adrenaline surges and the heart's workload increases, potentially triggering dangerous heart rhythms. Even if you've run without issues before, it doesn't guarantee safety this time. Moreover, as you approach the finish line, you must not ignore discomfort. After hours of running, seeing the finish line can make runners feel compelled to accelerate and sprint. However, this can increase the heart's load. Data from the American Heart Association indicates that many marathon and half-marathon-related cardiac events occur in the final mile. If your body is experiencing discomfort, don't push through it just because 'you're almost there.'