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The researchers then monitored their blood pressure, heart rate and cardiac output while they did stressful tasks. Low-output CHF is frequently associated with heart failure and is the result of a low cardiac output at rest or during exertion. In a study presented July 24 at an American Heart Association meeting in Chicago, Pendergast and his colleagues found that cardiac output -- the volume of blood pumped by the heart -- increased 50 percent and remained elevated throughout the shuttle flight, even though heart rate decreased and mean blood pressure remained constant. |
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