# GMT1 Task 4 Exercise On Cardiac Output Essay

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Pages: 5

LABORATORY REPORT
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Activity:
Name:
Instructor:
Date:

Effect of Exercise on Cardiac Output
Tara McColeman
Heide Langer Atkinson
July 26, 2014

Predictions
1. During exercise
HR will increase.
2. During exercise
SV will not change.
3. During exercise
CO will increase.

Materials and Methods
1. Dependent Variable
EDV, ESV, and cardiac cycle length
2. Independent Variable level of physical activity(resting or exercise)
3. Controlled Variables age, weight, height
4. What instrument was used to measure cardiac volumes?
MRI -specifically a cardiac MRI
5. Does the instrument used to measure cardiac volume use X-Rays? Explain.
No, it is a magnet. It uses the body's natural magnetic forces to take measurements, radiofrequency measurements, the ionic forces of hydrogen and water are detected to measure the image. It can measure LV&RVvolumes.Using short axis to measure EF&SV, also Traverse Saggital plane views

Results
Table 2: Resting and Exercising Cardiac Cycle Length, EDV, and ESV

Subject 1
Subject 2
Subject 3
Averages

Resting Values
Exercising Values
Cardiac
EDV (mL) ESV (mL)
Cardiac
EDV (mL) ESV (mL) cycle length cycle length
(msec)
(msec)
828
143
68
440
138
37
853
145
67
411
140
32
834
136
71
414
140
35
141
69
139
35

Resting and Exercising HR, EDV andESV

1. Resting and exercising cardiac cycle length -a. What was the average resting cardiac cycle length?
838
b. What was the average exercising cardiac cycle length?
422
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? it decreased with exercise

2. Resting and exercising EDV -a. What was the average resting EDV?
141
b. What was the average exercising EDV?
139
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? there was a slight decrease of 2 points lower during exercise. I would lean towards no change with exercise

3. Resting and exercising ESV -a. What was the average resting ESV?
69
b. What was the average exercising ESV?
35
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? decreased during exercise

Table 3: Resting and Exercising HR, SV and CO

Subject 1
Subject 2
Subject 3
Averages

HR (strokes per second)
72
70
72
71

Resting Values
SV (mL)
SV (L)
75
78
65

0.075
0.078
0.065
0.073

CO
5.4
5.5
4.7
5.2

HR (strokes per second)
136
146
145
142

Exercising Values
SV (mL)
SV (L)
101
108
105

0.101
0.108
0.105
0.105

CO
13.7
15.8
15.2
15

Resting and Exercising SV and CO

4. Resting and exercising HR –
a. What was the average resting HR?
71
b. What was the average exercising HR?
142
c. The range of normal resting HR is between 70 and 73 beats per minute for these subjects. Did average HR increase, decrease, or not change with exercise?
HR increased with exercise

5. Resting and exercising SV -a. What was the average resting SV?
0.073
b. What was the average exercising SV?
0.105
c. The range of normal resting SV is between 60 and 80 ml for these subjects. Did average SV increase, decrease, or not change with exercise?
SV increased with exercise

6. Resting and exercising CO –
a. What was the average resting CO?
5.2
b. What was the average exercising CO?
15
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?
CO increased during exercise

Discussion
1. What caused the change in HR with exercise? decreased ESV
2. Discuss the effect of venous return and heart rate on exercise EDV.
Venous return decreases because it's providing oxygen to the organs. Or maybe it's increasing to get more oxygen from the lungs exercise inc HR, contractility.Skeletal muscle action increases venous return,causing an