McCumbee - Exercise

Question 1

Pulmonary response to exercise

Answer 1

Increased ventilation

Improved V/Q matching

Question 2

Cardiovascular response to exercise

Answer 2

Increase CO

Redistribute blood flow

Question 3

How much O2 a person takes up and delivers to the tissue per minute

Answer 3

VO2

Question 4

Highest rate of O2 consumption that can be achieved during max exercise

Answer 4

VO2 max

Question 5

_____ in O2 consumption w/ increasing exercise intensity is the primary criterion that indicates VO2max has been reached

Answer 5

A plateau

Question 6

What has the greatest impact on limiting VO2max in a normal healthy person?

Answer 6

Cardiovascular function

Question 7

Up to ____% of variance observed in VO2 max is due to genetics

Answer 7

25-50%

Question 8

Extensive training can increase VO2max by ____

Answer 8

15-20%

Question 9

At 2/3 of the way through maximum exercise effort, there is a disproportionate increase in minute ventilation compared to exercise intensity

Answer 9

Ventilatory threshold

Question 10

At max exercise, the RR is about 40-50 and the tidal volume is about ____ of a person’s vital capacity

Answer 10

60%

Question 11

In exercise, arterial pH remains constant until _____

Answer 11

Ventilatory threshold is met and Ve cannot keep up with metabolic acidosis

Question 12

Stroke volume’s response to exercise:

Answer 12

At low to moderate workloads, increases w/ level of exertion, but then plateaus as the level of exercise becomes more intense

Question 13

What maintains the stroke volume during exercise

Answer 13

Mechanisms that aid in venous return:

Muscle pump

Larger and more freq inspirations

Venoconstriction due to sympathetics stimulation of alpha adrenergic receptors in veins

Arterial vasodilation in the exercising muscles

Sympathetic stim increases ventricular inotropy

Increased lusitropy

Atrial inotropy enhances atrial kick

Question 14

Stroke volume can increase about _____ during exercise

Answer 14

50%

Question 15

Systemic vascular resistance ______ as work intensity increases because of vasodilation

Answer 15

Decreases

Question 16

Blood pressure and heart rate are _____ related

Answer 16

Inversely

Question 17

During exercise, the arterial baroreceptor reflex is operating at a __________. Requiring a higher rise in blood pressure to cause a compensatory decrease in heart rate

Answer 17

Higher set point

Question 18

The net effect of widespread sympathetic stimulation and local vasodilation from metabolites is?

Answer 18

Shunting blood flow from inactive tissues to actively contracting muscles

Question 19

Two events that occur to increase blood flow to actively contracting skeletal muscles during exercise

Answer 19

Increase CO

Redistribution of blood to actively exercising muscles and away from other organs (splanchnic)

Question 20

During periods of intense exercise, blood flow to contracting muscle can account for more than ____ % of cardiac output

Answer 20

80

Question 21

More blood in contracting muscles is diverted to regions of muscle containing ______ fibers at the expense of regions with ______ fibers

Answer 21

Oxidative

Glycolytic

Question 22

Aerobic training -___ O2 delivery by _______ maximum cardiac output

Answer 22

Increases

Increases

Question 23

Increased O2 extraction in trained athletes is due to ?

Answer 23

Increased capillary proliferation

Increased capillary density which causes diffusion distance of O2 to drop.

Increased size and number of mitochondria in skeletal muscle fibers