Instructions > For this project, you are investigating how your circulatory system (heart rate) responds to physical activity. You will plan an experiment, complete it, and write a report using this worksheet. Unit 7 Lessons 1-3 will help you complete this worksheet. After you have submitted the worksheet on teachermade, upload a file to the dropbox in Unit 7 Lesson 3 stating that you completed the worksheet. Question How does my heart rate change in response to exercise? Hypothesis and Variables Write a hypothesis based on the question. State your hypothesis using an if/then format. For your experiment, you will be testing how two different exercises affect your heart rate. List your independent variable(s). List your dependent variable(s). Materials

Answer 1

Hypothesis and Variables

Hypothesis: If I engage in physical activity, then my heart rate will increase in response to the intensity and duration of the exercise.

Independent Variable(s):

1. Type of exercise (e.g., jogging, jumping jacks)
2. Intensity of exercise (e.g., low-intensity vs. high-intensity)
3. Duration of exercise (e.g., 5 minutes, 10 minutes)

Dependent Variable(s):

1. Heart rate (measured in beats per minute, bpm)

Materials

To conduct the experiment, you will need the following materials:

1. Stopwatch or timer
2. Heart rate monitor or a device to measure heart rate (like a smartwatch or fitness tracker)
3. Notebook and pen (for recording observations)
4. Space for physical activity (e.g., a gym, park, or backyard)
5. A partner to assist (optional but recommended)
6. Water bottle (to stay hydrated during the exercises)
7. A predetermined plan outlining which exercises to perform, their intensity, and duration

Procedure (to be elaborated in the report)

1. Warm-Up: Start with a 5-minute warm-up to prepare your body for exercise.
2. Measure Resting Heart Rate: Measure and record your resting heart rate before starting any physical activity.
3. Choose Exercises: Select two different exercises and define their intensity (e.g., low-intensity jogging vs. high-intensity jumping jacks).
4. Conduct Exercises:
   • Perform the first exercise for a set duration (e.g., 5 minutes) and measure your heart rate immediately after.
   • Rest for a few minutes to allow your heart rate to return closer to resting levels.
   • Perform the second exercise for the same duration and measure your heart rate immediately after.
5. Cool Down: Perform a cool-down routine and remeasure your heart rate until it returns to baseline.
6. Record Data: Note all the heart rate data and any observations during the exercises.

Conclusion (to be elaborated in the report)

After conducting and analyzing the experiment, you will draw conclusions regarding the effects of different types of exercise on heart rate relative to your hypothesis.

Note: You will record your findings and analyze how each type of exercise and its intensity influenced your heart rate, ultimately helping you understand the relationship between physical activity and circulatory responses.

This structured approach will help you gather thorough data for your investigation into how the circulatory system reacts to exercise.