Introduction
The heart pumps blood to every cell in you body. The pulse measures your body�s heart rate. Your heart rate increases during exercise. How much it increases depends on your level of fitness. In this Lab you will examine the effect of physical activity on your heart.
Objectives
1. Measure resting heart rate and pulse after/during exercise
2. Describe your state of fitness based on the return of your heart rate to normal
3. Describe what added weight does to your heart rate during/after exercise
Materials
? Book bag or back pack, 1 per group
? Books (10 lbs), 1 per group
? Watch or stopwatch
Procedure
Part A-Resting Pulse
1. Locate pulse on the thumb side of the wrist. Use only the first two fingers of your hand, not the thumb.
2. Count your pulse for 30 seconds. Multiply the number of pulses/beats by 2 to find your heart rate for one minute. Repeat this procedure 3 times. Record your Data in Table 1 in Data and Observations. Calculate your average resting pulse.
Part B-Fitness Estimate (be specific)
3. Make a Hypothesis about how your heart rate will change after exercise. Write your hypothesis in the space provided on the data sheet.
4. Do 20 squat jumps in about 40 seconds. To do this you must go down in one second and up the next second. Take your pulse immediately after this exercise. Record this figure in the space provided in table 2.
5. Rest for three minutes. Take your pulse again. Record the figure in table 2.
6. If your heart rate has not returned to normal after three minutes, rest for three more minutes. Check your pulse once more. Record this figure.
Part C-Effect of added weight on Heart Rate
7. Make a hypothesis about what effect added weight will have on heart rate. Write you response in the space provided.
8. Jog in place for three minutes. Take your pulse immediately after you stop. Record the figure in Table 3 in data and observations.
9. Put on a backpack or carry a book bag with 10lbs of books. This will increase your total body weight.
10. Jog in place for three minutes. Take your pulse immediately after you stop. Record the figure in the space provided.
Fitness Estimate
Hypothesis 1: ______________________________________________________
Added Weight and Exercise
Hypothesis 2: ______________________________________________________
Trial Pulse Count (30 sec) Resting Pulse (beats/Min)
1.
2.
3.
Average Resting Pulse (beats/Min)
Table 2
Average resting pulse from part A ____________________
HR (Beats/Min) immediately after exercise ____________________
HR (Beats/Min) after resting 3 min. ____________________
HR (Beats/Min) after resting additional 3 min. ____________________
Table 3
Resting pulse from part A ____________________
HR (Beats/Min) after jogging in place for 3 min. ____________________
HR (Beats/Min) after jogging for 3 min with weight ____________________
Analysis
1. How does your resting pulse compare to the average resting pulse for someone your age?
2. What was your fitness estimate? Why do you think your estimate came out the way it did?
3. Why is the time it takes the heart rate to return to normal after exercise important in determining fitness?
4. Was your heart rate higher after exercise with or without the added weight? Why?
5. Do the data support the hypothesis?
6. Design an experiment to examine heart rate under other conditions.