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The aim of this experiment is to investigate the effect exercise has on the pulse rate. The pulse rate is defined as 'The rhythmical throbbing of arteries produced by the regular contractions of the heart'.

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Introduction

The aim of this experiment is to investigate the effect exercise has on the pulse rate. The pulse rate is defined as 'The rhythmical throbbing of arteries produced by the regular contractions of the heart'. I will attempt to conduct my investigation in a safe manner by having an adult and a first aid kit nearby in case of any accidents. In addition the experiment shall be performed in an open space to avoid damage to other equipment or myself. Suitable clothing shall be worn to prevent hazards from occurring. I predict that the pulse rate during exercise will increase. This is because during exercise the muscles of the body are contracting faster and therefore need more oxygen to be satisfied. This will increase the pulse rate, as the heart will have to pump more blood at larger volumes at a faster rate. As a result there would be an increase in the amount of carbon dioxide (CO2) produced because it is a bi-product of respiration. ...read more.

Middle

However the individual heart muscle cells cannot be allowed to contract at their own rhythm as if they did parts of the heart would contract out of sequence with other parts and the sequence of the cardiac cycle would become disordered, and the heart would stop working as a pump. The cardiac cycle is started by a specialized patch of muscle in the wall of the right atrium, called the sinoatrial node (SAN) or pacemaker. The muscle cells of the SAN set the rhythm for all the other cardiac muscle cells. They have an inbuilt rhythmic contraction, which is slightly faster than the rest of the cardiac muscle. When they contract a wave of excitation spreads from the atrium to the ventricles. The excitation spreads from the atrium to the ventricles. The excitation waves spread outwards and upwards through the fibres at the base of the heart and makes the ventricles contract. When this occurs, it causes the cardiac muscles in the walls to contract, from the bottom up, so squeezing blood upwards from the ventricles and into arterioles, in order for the blood to be delivered to the needy cells. ...read more.

Conclusion

Referencing: during class time, I did a quick practical test, where I had to jog on the spot for a minute and immediately take the pulse rate. In addition, I have also studied about the heart in lesson time and private study. This enabled me to get an overall picture of the experiment. THE METHOD The experiment will take place when resting pulse rate has been identified. The individual will step up on to the platform and step down as many times as possible in one minute increments up to five minutes. Between each increment the individual will sit down and rest for one minute. After each increment I will measure the individuals pulse from their neck. I will conduct the experiment three times to get a more accurate set of results and then take the average result for each time. The fixed variables in this experiment I have identified are: 1) Time duration of exercise 2) Platform height 3) Platform location 4) Room temperature 5) Clothing worn The independent variable will be the time lengths of exercise. The dependant variable will be the pulse rate. BENITO SEGARAJASINGHE THE EFFECT OF EXCERISE ON THE PULSE RATE 11NI 1 ...read more.

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