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How the heart responds during exercise
Member rating: No Rating | Words: | Submitted: Tue Sep 09 2003
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How the heart responds during exercise Several things happen to your heart while you exercise. First, your heart rate, that's the number of times your heart beats per minute, increases to pump more blood to the muscles all over the body which are working harder. Therefore, your cardiac output increases. This is the amount of blood that the heart pumps out to the body. The heart rate and the cardiac output are proportional to each other. The other factor in this proportional equation is the stroke volume. The stroke volume is the amount of blood pumped out of the heart with each contraction of the ventricle. An average adult's stroke volume is about 70ml. When resting, the heart has a cardiac output of about 5 litres. You can calculate the cardiac output by using a simple formula: Stroke Volume x Heart Rate = Cardiac Output or (SV x HR= CO) Heart rate varies according to the amount...
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