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Physical exercise increases the heart rate because the working muscles require more oxygen to produce the energy required to sustain that physical activity. Healthy Living at AZ Central explains that the heart pumps the ... More »

As soon as a person begins to exercise, the heart begins beating more rapidly in an effort to pump oxygen-containing blood to the muscles. In order to contract, which they must during exercise, muscles require more oxyge... More »

According to the British Journal of Anaesthesia, heart rate rises during exercise in order to increase cardiac output, compensating for increased blood flow demand to working muscles. Blood flow to the muscles is increas... More »

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While the normal resting heart rate is 60 to 80 beats per minute, according to the American Heart Association, heart rate during exercise is measured in relationship to the target heart rate, rather than to any average. ... More »

During exercise, the muscles pull oxygen out of the bloodssstream, blood vessels dilate for increased blood flow, the heart and diaphragm work harder, and the body starts to sweat to remove heat from the body. On the mol... More »

The body needs more oxygen during exercise because the muscles need to produce more energy for the body to become more active, explains the Lung Institute of Western Australia. This is done by breaking down glucose from ... More »

According to the BBC, the pulse rate increases after exercise because exercise increases the need for energy in the body, which in turn increases the need for food and oxygen. The breathing rate also speeds up during and... More »