1. Name: Diane Guo
Partners: Xavier, Michael
Date of experiment: 2011-3-23
How can exercise affect your heart rate?
Aim: To see how much does your heart rate increases after changing the type of exercise
you are doing.
Hypothesis: the heart rate will raise the most after sprint.
Variables:
Input variable: The ways of exercising, we will first test sprint, then change to
jog and finally walk.
Output variable: Xavier’s heart rate. We will measure his heart rate right after
he sprint/job/walk, and get the average heart rate after doing the 3 trails.
Control variables:
Control variable 1: Distance of laps--- run the same distance every time
Control variable 2: The athlete--- use the same person to run every time
Control variable 3: The speed of exercise --- Run/jog/walk at the same
speed every trial
Materials:
- Stop watch
- Writing utensil
- Track
- Athlete
- Pulse taker
Method:
1. Test your heart rate 3 times before you run (each for 1 minute, using the blood
pressure cuff)
2. Write down the data
3. Xavier sprints
4. Measure the heart rate using the blood pressure cuff (BPM)
5. Write down the data
6. Rest for the heart rate to return normal
7. Repeat step 3-6 two times

2. 8. Xavier jogs (the same distance as sprint)
9. Measure the heart rate using blood pressure cuff (BPM)
10. Write down the data
11. Rest for the heart rate to return normal
12. Repeat step 8-11 two times
13. Xavier walks (the same distance)
14. Measure the heart rate using the blood pressure cuff (BPM)
15. Write down the data
16. Rest for the heart rate to return normal
17. Repeat step 13-16 two times
Results:
Table: Heart rate after exercise (BPM) Average heart beat: 82
Exercise Trial 1 Trial 2 Trial 3 Average
Sprint 105 126 131 121
Jog 110 86 104 100
Walk 98 108 113 106
Y-axis
X-axis
Conclusion:
Our hypothesis was correct; our hypothesis was “the heart rate will
raise the most after sprint”. The reason why it raised was because the heart
needs to pump faster when the athlete does exercise that requires more
movement; the heart needs to pump more and needs more oxygen. Therefore
the heart rate raised a lot. The relationship between the input and output
variables is, when doing the exercise that requires more speed, the heart rate
raises the most. After the sprint, Xavier’s heart beat raised 39 beats from his
average heartbeat. After the jog, Xavier’s heartbeat raised 18 beats, and after
the walk, Xavier’s heartbeat raised 24 beats. His heartbeat raised the most after
sprinting. His sprinting heart rate was 105, 126, 131, then we divide them by 3

3. to get the average. My data is unreliable, because our common sense knows
that the heart rate for sprinting should be more than jogging and walking.
However in our data table, it shows that the average heart rate of sprinting is
121 BMP (beats per minute), the average heart rate of jogging is 100 BMP, and
the average heart rate of walking is 106 BPM. Obviously the data is wrong, the
walking heart rate should be the lowest, but in my data, it’s even higher then
jogging. It was hard for us to measure the heartbeat of sprinting, and it took us
a lot of time. It is because Xavier needed a lot of time to recover his heart rate,
and sometimes it takes 10 minutes to return to normal heart rate.
Evaluation:
The part of the method went really well was that we made steps for recovering
time. The recovering time was very important for our experiment, and it took the
most part of the experiment. If Xavier’s heart rate didn't return to normal, then our
data will not be as accurate and true. Some improvements I can make for the
method is that I should have made it shorter, so that we can finish the experiment
in one day.
Some things that could be changed for method for the next time are we will
only do sprint and walk; it is easier to see the difference, and take less time to the
experiment. Also, we would like to concentrate on the experiment so it will take
less time to do it.
Some errors we did during this experiment were that when the athlete was
suppose to rest, he was moving around, so that effected his heart rate. And there
was one time when he walked with his heart rate at around 100, which was not the
normal heart rate. And we should do the experiment all in one day, because the
next day the athlete might have some body issue that affect the result.
If I can do this experiment again, I would like to make the input variable into
the amount of time you exercise, instead of the amount of exercise. I could first
measure the heart rate when running 30 seconds, then change to 60 seconds (at
the same speed), and so on.