Regular exercise increases life expectancy, quality of life and work capability and productivity. In patients with ischemic heart disease the non-pharmacologic exercise treatment decrease morbidity and mortality of patients. Exercise is an easily accessible and inexpensive approach to improve cardiovascular health, control weight gain, and increase survival chances after a morbid event such as a myocardial infarction. It is, however, sometimes associated with untoward effects in vulnerable subjects. A contributory factor may be heart rate variability, which in the long-term is increased in association with exercise, but may be decreased in the short-term during exercise and the recovery span after exercise (1-4).