Exercise 3.2: The Effect of Exercise

Experiment Time: The Effect of Exercise on Pulse Rate

Problem: An experiment is always started with the problem and is always stated as a question. In this case our stated problem will be: Does exercise have an affect on your heart rate?

Hypothesis: This is an educated guess of what the answer to the problem will be. It involves researching the problem before the experiment is conducted. From your previous experience what would you think the affect of exercise will be on heart rate? Write your answer here.

Experimental Design: In this category the scientist will explain what the manipulated and responding variable will be in the experiment. The manipulated variable is that is the thing you change on purpose during the experiment. Again in this experiment the manipulated variable will be the change in activity you have during the experiment. The responding variable will be the changes that happen because of the manipulated variable changing. The responding variable in our experiment will be the change in heart rate.

Procedure: The next step is to write down all the steps in the experiment. Here is our procedure. Read over the complete procedure before you begin.

1. Collect three or four friends of about the same age as yourself to do the experiment with you.

2. Rest in comfortable chairs for five minutes.

3. At the end of the five minute period, measure your resting heart rate and keep your eye on a clock or watch, count the number of times your heart beats in one minute. (Everyone should use the same clock and start and stop at the same time.)

4. Record your results in the table below under 'Resting Pulse Rate'.

5. Find a wide open space away from furniture and other objects and do jumping jacks for 3 minutes.

6. At the end of the three minutes count your pulse rate for one minute. (It is very important that you do not wait after the exercise before you begin your counting. Begin the count right away.)


Record your results under 'Exercise Pulse Rate' in the table below. Don't use older adults for this experiment.

Name of Participants
Age of Participants
Resting Heart Rate in breaths per minute
Exercise Heart Rate
Difference in Heart Rate

Analyze and Conclude
This is the most important part of the experiment! What do the results mean? Look at the data in the table above, review what you have learned from the lesson on respiration and answer the following questions.
1. 1. Name three factors that could affect a person's heart rate.
2. Do you think physical fitness is a factor that could affect the exercise pulse rate? Explain
3. Did everyone have about the same increase in pulse rate?
4. Examine the data on resting pulse rate you collected from your family at the beginning of the activity. Does age seem be a factor that affects pulse rate? If your answer is yes, try to explain some reasons why that is so.
Further Experimentation and Research:

This is where you record all the things that went wrong in the experiment and how you would do the experiment differently next time. Record your answer here.