3.5.1 Exercise and Cardiovascular Fitness Flashcards
What is a VO2?
Oxygen consumption. VO2 max is the max amount of oxygen a person can consume
What happens to the heart rate during acute exercise?
It increases, sometimes up to 3 times resting value
What happens to cardiac output during acute exercise?
It increases.
How is venous return increased during acute exercise?
Increased venoconstriction, muscle pump, increased inspiration leading to decreased thoracic pressure
What happens to stroke volume during acute exercise?
It can increase up to 1.5 times resting value. Ejection fraction can increase from 53% to 85%
Why is there a leveling off in the increase of stroke volume during exercise?
Because at some point the HR doesnt allow for increased SV
How does O2 consumption differ during exercise?
There is a much greater consumption of O2 in the tissues and much less returning to the heart on the venous side
What are the changes in BP and resistance during exercise?
systolic BP - increase
Diastolic BP - stays mostly the same
MAP increases slightly
TPR - decreases due to vasodilation in the muscle
How does myocardial flow change during exercise?
Increase vasodilation allows for increased flow
How does blood flow to the skin change during exercise?
Increased as duration increases to allow for heat to dissipate. It will decrease at max exercise to meet muscle demands
What is minute ventilation?
The amount of air that goes in and out over the course of a minute
How does plasma volume change during exercise?
Blood plasma volume increases in the interstitium of exercising muscle. This increase blood hemoconcentration (increase viscosity)
What is the anaerobic threshold?
Indicates the level of exercise where body has reached level in which energy can longer be solely supplied by aerobic metabolism
What is the RER?
Respiratory exchange ratio
How does RER change during exercise?
1.0 indicates that anaerobic metabolism is present.
RER will increase during exercise as CO2 production rises at a greater rate than O2 consumption
