2 Years of Exercise Reversed 20 Years of Aging in the Heart, Says Longest-Ever Randomized Trial on Exercise
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Middle-aged hearts retain some degree of cardiac plasticity, and may represent a more optimal time—or quite simply the last time—to intervene.

it effectively turned sedentary 55-year-olds into 30-year-olds when viewed through heart activity monitoring equipment.

Being that heart disease is the leading cause of death for most people in the United States, and cardiac strength is inversely correlated with heart disease, it’s probably one of the most significant studies on exercise ever carried out.