Why does our heart beat faster after running
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This happens because your leg muscles use more energy to go fast. That energy comes from the blood and oxygen that the heart supplies. So when your leg muscles work harder, your heart has to work harder to supply blood faster.
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During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body.
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