EXPH 4145-100 Lab Twelve

What is a typical maximal exercise SV in an untrained subject (use mL)?

130

What is a typical maximal exercise a-VO2 diff in an untrained subject?

15

What is a typical maximal exercise Q in a trained subject (use L)?

35

What is a typical resting a-VO2 diff in an untrained subject?

5

The changes in MAP (Y-axis) from rest to maximal intensity cycling exercise (X-axis) in a young healthy subject.

I

The most common changes in TPR (Y-axis) from rest to maximal intensity cycling exercise (X-axis) in a young healthy subject with an appropriate vasodilatory response to exercise.

V

If graph II depicts changes in SV (Y-axis) between rest and maximal intensity cycling exercise in a healthy untrained subject, what would be appropriate values for points a and b on the Y-axis in an elite male endurance athlete?

a. = 72 b. = 220

If graph V depicts the changes in TPR (Y-axis) between rest and maximal intensity cycling exercise, what factors could be contributing to this change? a. Local metabolic factors acting on arteriolar smooth muscle in the active muscles b. NEP binding with alpha adrenergic receptors on the arteriolar smooth muscle in the active muscles c. Two of these answers d. The PNS acting on the arteriolar smooth muscle in the active muscles e. The SNS acting on the arteriolar smooth muscle in the active muscles

a. Local metabolic factors acting on arteriolar smooth muscle in the active muscles

If graph II depicts the changes in EDV (Y-axis) between rest and maximal intensity exercise in a healthy untrained subject, what factors could be contributing to this change? a. SNS constriction of arterioles b. An increase in muscle pump activity c. An increase in BV d. Two of these answers e. None of these answers

b. An increase in muscle pump activity

As SV increases, it would be expected that ESV would: a. Neither increase or decrease b. Increase c. Decrease d. Stay the same

c. Decrease

If graph V depicts the changes in ESV (Y-axis) between rest and maximal intensity cycling exercise in a healthy untrained subject, what factors could be contributing to this change? a. Three of these answers b. An increase in isotropy due to sympathetic stimulation of the ventricles c. Two of these answers d. The Frank-Starling law e. A decrease in parasympathetic stimulation of the ventricles

c. Two of these answers

If graph I depicts the changes in a-VO2 diff (Y-axis) between rest and maximal intensity cycling exercise, what factors could be causing this change? a. A decrease in pulmonary capillary PO2 b. Two of these answers c. None of these answers d. A right shift in the O2 dissociation curve e. A left shift in the O2 dissociation curve

d. A right shift in the O2 dissociation curve

If graph V depicts the changes in TPR (Y-axis) between rest and maximal intensity cycling exercise, how would this figure look different if the subject were performing dynamic knee extensions? a. It would still decrease, but not as much b. It would remain relatively steady (neither increase nor decrease) c. None of these answers d. It would increase instead of decrease e. It would be about the same

d. It would increase instead of decrease

During ACUTE exercise, which of the following would NOT be associated with an increase in EDV? a. An increase in muscle pump activity b. Sympathetically mediated venoconstriction c. All of these WOULD increase EDV d. Two of these e. An increase in preload f. An increase in BV g. An increase in afterload h. An increase in activity of the respiratory pump (ventilation)

d. Two of these

If graph I depicts the changes in a-VO2 diff between rest and maximal intensity cycling exercise, what factors could be causing this change? a. Two of these answers b. A decrease in systemic capillary PCO2 c. None of these answers d. An increase in pH e. A decrease in blood pH

e. A decrease in blood pH

Which of the following is/are NOT true about a-VO2 diff and its response to exercise? a. It usually increases during exercise mostly due to decreases in venous O2 content b. A rightward shift in hemoglobin's oxygen dissociation curve would tend to increase it c. It is usually reported in vols% d. Two of these are NOT true e. It usually increases during exercise mostly due to increase in arterial O2 content

e. It usually increases during exercise mostly due to increase in arterial O2 content

If graph V depicts the changes in TPR (Y-axis) between rest and maximal intensity cycling exercise, how would this figure look different if the subject were performing arm crank exercise? a. None of these answers b. It would remain relatively steady (neither increase or decrease) c. It would increase instead of decrease d. It would be about the same e. It would still decrease, but not as much

e. It would still decrease, but not as much