Depression is common and estimates suggest that in a family of four, one of the family members will likely suffer from mental health problems. Depression is even 3 times more common in patients after a heart attack than in the general population. Depression after a heart attack is bad not only because of the accompanying emotional distress, it also increases the risk of having another heart attack or premature death.
Studies of patients with coronary heart disease with elevated depressive symptoms support that exercise is just as effective as antidepressant drugs, and that the reduction in depressive symptoms among those participating in cardiac rehabilitation is related to improvements in fitness. All together the existing literature gives support for a positive effect of aerobic exercise on depressive symptoms in patients with established heart disease.