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The cardiologist is a physician who treats and diagnoses disease and injury of the heart and cardiovascular system. The interventional cardiologist is a physician who performs a variety of invasive tests and procedures to assist in diagnoses of and treatment of cardiac disease. A cardiac or cardio-vascular surgeon can be a cardiologist who specializes in surgical interventions of the heart and vascular system.
An exercise physiologist studies the human body's physiology during exercise and physical exertion. He or she uses different tools to study the body systems and how they respond to the stimulus of exercise. This allows the physiologist to gather information for the understanding of the patient, athlete, or study being conducted.