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Investigating the relationship between exercise and pulse rate

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Introduction

Investigating the relationship between exercise and pulse rate Hypothesis Exercise has a direct impact on pulse rate. Pulse rate will increase as the exercise gets more energetic. Introduction When the heart contracts a surge of blood flows into the aorta and the pulmonary artery under pressure. The volume of blood pumped out from each ventricle is referred to as the stroke volume. The total volume pumped out per minute is the cardiac output. The surge of blood distends arteries as the walls of arteries contain elastic tissue. The stretch and subsequent recoil of the aorta and arteries travel as waves through the body. This is the pulse. The pulse is measured at the wrist where the radial artery passes over a bone, or at the carotid artery at the neck, so this is where it can be felt most. To measure the pulse, count each 'beat' for 30 seconds while person is sitting, and doubled to give resting pulse rate in beats per min (bpm). ...read more.

Middle

Carbon dioxide is produced as a waste product of respiration, and this is toxic to the body, and cannot be allowed to build up. As the oxygen diffuses into the muscle cells, carbon dioxide diffuses out down a concentration gradient. This is carried back to the lungs where is diffuses out as we exhale. The heart needs to pump fast to remove this toxic gas too. I predict that the direct relationship between pulse rate and exercise will be quite hard to measure as different variables will affect the pulse rate. Some variables are: * age * sex * height * weight * current health * previous health history (i.e. suffer from cardiovascular or pulmonary disease * medication * time of day * how much sleep the person got the night before * what exercise has already been carried out today * current fitness level * time since last meal * type of exercise * which muscle groups are being used * ...read more.

Conclusion

Count each beat for 30 seconds then multiply by 2 to get beats per minute (BPM). Record in a table. 2. Using a stopwatch, subjects should walk at a normal pace for 1 minute. The pulse should be measured as before, and recorded in the table. 3. Subjects should rest for a minute so pulse rate returns to normal. 4. After a minute, subjects should jog briskly for 1 minute. Pulse should be recorded as before 5. Subjects should rest for a minute so pulse rate returns to normal. 6. Subjects run at a fast pace for 1 minute, then pulse should be recorded as before. 7. Subjects should rest for a minute so pulse rate returns to normal. 8. Subjects run at a very fast pace for 1 minute, then pulse should be recorded as before. Table of Results 1 2 3 4 5 6 7 8 9 10 Average BPM while resting BPM while walking BPM while jogging BPM while running BPM while ...read more.

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