Vascular Activity Exercise

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BIOS 255 Week 4 Lab: #7 Effect of Exercise on Arterial Pressure and Vascular Resistance LABORATORY REPORT Activity 7: Effect of Exercise on Arterial Pressure and Vascular Resistance PREDICTIONS 1. During exercise: MAP will increase 2. During exercise: CO will increase 3: During exercise: SVR will decrease MATERIALS AND METHODS 1. Dependent Variable: heart rate (HR), stroke volume (SV), blood pressure (BP) 2. Independent Variable: level of activity 3. Controlled Variables: age, gender 4. Identify one variable that was not controlled in this study (not dependent or independent variables. Hint: Think about the possible differences between subjects. The subject’s weight, ethnicity, and height were not controlled…show more content…
The range of resting SVR for the subjects in this experiment is 10.2–12.03 mmHg per min/L. Did SVR increase, decrease, or not change with exercise? The SVR decreased with exercise. DISCUSSION 1. Explain what caused the observed changes in systolic BP and MAP with the exercise. The average systolic BP post exercise is 148 mmHg and the MAP post exercise is 104 mmHg. Differences between the two is a result of the exercise increasing blood flow to skin, heart, and skeletal muscles but reducing flow to other organs such as urinary, reproductive, and digestive organs. 2. Compare the resting and exercising systemic vascular resistance values and discuss what causes the observed change with exercise. The systemic vascular resistances (SVR) from resting (average 17 mmHg) to after exercising (6.5 mmHg) decreased. SVR is affected by cardiac output, blood vessel diameter, and length of vessels. Cardiac output increases if the heart rate or stroke volume is increased. Blood vessels, if constricted, increase SVR and blood pressure while vasodilation decreases SVR and blood pressure. The longer the length of the blood vessel(s), the greater the SVR, therefore, the greater the resistance, the greater the cardiac output and blood pressure must be to overcome the

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