An investigation to show the difference in heart rates before and during intense exercise. Aim: The aim of the investigation was to discover how the heart rate varied with the intensity of exercise. The heart rate is a term describing the regularity of the cardiac cycle. The heart rate is the amount of times it contracts (beats) in a unit of time, nearly always per minute. At rest the adult female’s heart rate regulates 75 bpm (beats per minute) but this varies between people. If the heart rate is measured before, during and after exercise, results will prove that the number of beats per minute is greater during exercise than when you’re at rest; this is because the heart is working vigorously allowing the body to supply blood to the working muscles more quickly. The nervous system monitors the body and signals your heart to beat faster in response to increased activity. The blood is rushing around the heart to get rid of deoxygenated blood and carries back oxygenated blood from the lungs. The atrium and ventricle valves open by force circulating the blood going around the body. The time taken to recover is the amount of time it takes a person’s heart rate to go back to its resting rate. Predictions
It has been predicted that the more energy used by a person during exercise, the more increase cardiac output. Cardiac output cannot increase indefinitely, primarily because of the available filling time shortens as the heart rate increases. Another prediction that has been made is that the heart rate will depend on the pace the individuals are stepping at. The quicker the pace of the exercise the more the heart rate increases which would mean the longer it takes the individuals heart rate to go back to normal because they are using more energy. Before you begin to exercise, your heart rate increases slightly due to a general rise in sympathetic activity as you think about the work out ahead. When you exercise your muscles tend to move more energetically, than...
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