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Your heart speeds up to pump extra food and oxygen to the muscles. Breathing speeds up to get more oxygen and to get rid of more carbon dioxide. When a fit person, such as an athlete, exercises the pulse rate, breathing rate and lactic acid levels rise much less than they do in an unfit person.

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8y ago
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13y ago

because you muscles need more blood to keep moving fast ... so your heart pumps quicker to get this blood to your muscles. :D

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11y ago

Jam er & st*u, wiki that sh*t

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Q: Why his heart rate increases during a sprint?
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