LABORATORY REPORT
Activity 6: Effect of Exercise on Cardiac Output
Name:
Instructor:
Date:
PREDICTIONS
1. During exercise:
2: During exercise:
3. During exercise:
MATERIALS AND METHODS
1. Dependent Variable
2. Independent Variable
3. Controlled Variables
4. What instrument was used to measure cardiac volumes?
5. Does the instrument used to measure cardiac volume use X-Rays? Explain.
RESULTS
See Table 2: Resting and Exercising Cardiac Cycle Length, EDV, and ESV
See Graph: Resting and Exercising HR, EDV, and ESV
1. Resting and exercising cardiac cycle length -a. What was the average resting cardiac cycle length?
b. What was the average exercising cardiac cycle length?
c. The range of normal resting cardiac cycle length is between 818 and 858 ms. Did
average cardiac cycle length increase, decrease, or not change with exercise?
2. Resting and exercising EDV -a. What was the average resting EDV?
b. What was the average exercising EDV?
c. The range of normal resting EDV is between 135 and 145 ml for these subjects. Did
average EDV increase, decrease, or not change with exercise?
3. Resting and exercising ESV -a. What was the average resting ESV?
b. What was the average exercising ESV?
c. The range of normal resting ESV is between 65 and 75 for these subjects. Did
average ESV increase, decrease, or not change with exercise?
See Table 3: resting and Exercising HR, SV, and CO
See Graph: Resting and Exercising SV and CO
4. Resting and exercising HR –
a. What was the average resting HR?
b. What was the average exercising HR?
c. The range of normal resting HR is between 70 and 73 beats per minute for
subjects. Did average HR increase, decrease, or not change with exercise?
these
5. Resting and exercising SV -a. What was the average resting SV?
b. What was the average exercising SV?
c. The range of normal resting SV is between 60 and 80 ml for these subjects.
average SV increase, decrease, or not change with exercise?
Did
6. Resting and exercising CO –
a. What was the average resting CO?
b. What was the average exercising CO?
c. The range of normal resting CO is between 4.2 L per minute and 5.84 L for these
subjects. Did average CO increase, decrease, or not change with exercise?
DISCUSSION
1. What caused the change in HR with exercise?
2. Discuss the effect of venous return and heart rate on exercise EDV.
3. What caused the change in ESV volume with exercise?
4. Why did SV change with exercise?
5. Discuss the importance of the change in CO with exercise?
6. Restate your predictions that were correct and give data from your experiment that
support them. Restate your predictions that were not correct and correct them, giving
supporting data from your experiment that supports your corrections.
APPLICATION
1. We measured the stroke volume of the left ventricle. What was the average stroke
volume of the right ventricle at rest and after exercise?
2. Assume that for one beat, the stroke volume of the left ventricle is greater than that
of the right ventricle. Explain why in a normal heart this would be corrected on the next
beat.
3. Explain why elite athletes have a lower than normal heart rate, yet have a higher than
normal ability to increase cardiac output.