The Effect of Exercise on Pulse Rate
Introduction: This experiment tests the effects of exercise on pulse
Pulse rate represents the beating of the heart, specifically the
blood from the left ventricle to the general circulation of the body.
Before the start of exercise
, your pre-exercise heart rate usually
above normal, and this is called an anticipatory response. During
exercise, respiration increases based on the amount of activity being
done. When exercise is being completed, there is an increased demand
for gas exchange, due to the circulatory system being under continuous
stress. Oxygen consumption increases rapidly, aswell as carbon dioxide
Regular exercise also produces changes in circulation. The blood flow
to working muscles increase, and this means that more oxygen and
energy can be delivered to the muscle cells. Blood volume and the
number of red blood cells
also increase with this large flow, and
levels rise considerably.
In our experiment we have decided to test a type of aerobic exercise;
skipping. This will effect various parts of the body and is designed
build up stamina and keep a regular heart beat. This involves aerobic
respiration, which is obviously connected with the type of exercise.
Equipment: Stopwatch - for timing the length of time for each exercise
Skipping rope - for completing the exercise
Method: The equipment will be taken to level ground, and my pulse will
be taken for
1 minute and recorded. Then the 1 minute of continuous skipping will
completed at an average speed of one jump per second, and the pulse
immediately taken after the time for 15 seconds, multiplied by 4 and
There will then be a rest period of 3 minutes, before the exact same
exercise will take place, straight after the pulse has been taken
The process of measuring pulse rate
, followed by exercise and then
recording pulse rate again, will be completed once more for 1 minute
skipping, and then carried out for 2 and 3 minutes of skipping
Again, each time will be repeated three times to create an accurate
and all results will be recorded in a table.
Fair Test: For this investigation, we have decided to make it a fair
test by making
sure that the following points are true;
I will average 1 jump per second when I complete the skipping. This is
that my speed will stay regular and my style will stay constant.
Throughout the experiment, I will stay as the person doing the
and Sona will time and measure my pulse. There could not be a fair
because everyone has individual characteristics which could affect the
results i.e. resting pulse rate.
We will repeat each exercise 3 times, so that we can record accurate
and get an average for the different times.
After the exercise is done, there will be a 3 minute rest period to
pulse rate back to its resting state. This enables us to record
results for measuring the effects of exercise on pulse rate.
When recording the resting pulse rate, we will time it for 1 minute
time, because this gives the exact average beats per minute for
the person. After the exercise, we decided that we will time the pulse
for just 15 seconds, and then multiply the number by 4, as this is
right amount of time as for the heart rate not to decrease.
Hypothesis: I predict that with the increase in time when the exercise
the pulse rate will also increase. Although, because skipping is an
aerobic exercise, I also think that as you increase the amount of
your body anticipates the amount of exercise being done and starts to
become used to the increase in pulse rate and can cope with it better.
Whereas, for smaller amounts of time, your body carries on working
harder to deal with the stress because it does not know how long you
going to carry on, and so anticipates that you need the increased
1 minute of skipping
2 minutes of skipping
3 minutes of skipping
Average beats per min. before skipping
Average beats per min. after skipping
The two graphs below show the pulse rate before and after exercise;
From these two graphs and the one on the previous page, we can see
that exercise clearly does have an effect on pulse rate, as it has
risen considerably compared to the resting pulse rate. When the amount
of time was increased for the skipping, the pulse rates varied quite a
lot. We expected that the pulse rate would increase more steadily than
the results have shown, because although the highest rate was for 3
minutes of activity, it also showed one of the lowest rates of the
For the graph that shows the increase in pulse rate we can see that
there have been some anomalous results. We found that when the
skipping was completed for 2 minutes, there were big variations in the
increase in pulse rate. It ranged between the three attempts from 43
to 86, which was quite unexpected as we thought that there would be a
lot more steady increase.
I think that the reason for the varying results, is that the stress
that the body was under was not art all anticipated during the
exercise as expected. This, in my opinion is slightly strange, but our
results prove that we had some very unexpected results. But looking at
our results from an overall perspective, they did to a certain extent
with my prediction. Pulse rate was definitely affected by the aerobic
exercise, and did increase by a decent amount, and the pulse rate did
not rise by a large amount when the amount of time was increased to 3
minutes, which is what I predicted.
Our method for testing the prediction was suitable, and the experiment
worked well and produced enough information in order for us to
analyse. The anomalous results that we witnessed actually helped me to
come to different conclusions and were not bad results for us to have.
To improve the experiment to get some more reliable evidence, I think
we could have maybe used some more varied times for testing the
effects of exercise on pulse rate, in order to get more constant
results to analyse. But apart from that I think that the experiment
that we carried out worked well enough, and gave us some interesting
and varied results. To extend the investigation, we could have changed
another variable to help get different aspects of results for example;
type of exercise
length of time for the exercise
the rest periods the no.of seconds pulse rate is
measured for before/after exercise
Overall, the experiment we completed produced some unexpected results,
but allowed us to analyse the results more carefully. After looking at
all of the results, I have come to the conclusion that exercise does
have an effect on pulse rate, and as the amount of activity increases
so too does your pulse rate, but only up to a certain point.