I see with great concern, as it becomes more and more common among athletes, the manifestation of heart disease, either in the form of syncopes (fainting), arrhythmias (palpitations) and in the worst case fatal myocardial infarcts. While the exercise Aerobic physique has great benefit over the cardiovascular system if it is not carried out in an orderly and progressive way (time and intensity) it can become highly pernicious. When doing physical activity for long periods such as cycling and jogging, our heart is subjected to different levels of load and if it is not healthy in its structure (adequate contractility, good ejection fraction) or find resistance to pump enough blood (arterial hypertension) multiply the probabilities of fatal acute events. It is very important that the development of muscle mass consistent with physical exercise is harmonious with the development of adequate cardiopulmonary capacity, and this is achieved with a correct and monitored exercise routine. in terms of duration and intensity, ADEQUATE FOOD AND INDIVIDUALLY adapted to the requirements of the individual and frequent medical checkup frequent.If this does not happen, you can fall into the serious error, that the striated muscle develops faster than the cardiopulmonary capacity of the individual , forcing more and more the heart to bear loads that in time it could not handle, thus manifesting episodes of intense fatigue, palpitations or acute myocardial infarction. Many other cases present poorly controlled hypertensive patients or who simply do not know they are, and assume that when exercising, they are fully protected. A correct balance is needed in the aforementioned aspects, in order to avoid serious consequences. Are you as good as you feel?
I recommend that you go to your trusted doctor, objectively check your health.