7. The Athletic Heart Flashcards
What is the HR’s response to dynamic exercise?
Roughly a tripling of HR
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/114/755/a_image_thumb.png?1453508905)
How does training affect SV and HR?
- Increased SV
- Lower resting HR
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/119/216/a_image_thumb.png?1453509019)
What is SV’s response to dynamic exercise? How?
- Increased filling due to:
- Venous return
- Preload
- Increased emptying due to:
- Frank Starling Law
- Increased contractility
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/119/397/a_image_thumb.png?1453509264)
How does peripheral resistance respond to the tissues’ increased demand for O2?
Decreased peripheral resistance to flow
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/119/526/a_image_thumb.png?1453509327)
How is blood flow to the organs redistributed w/ increasing exercise intensity?
- Brain always gets constant amount
- Flow to the heart and muscles increases proportional to exercise intensity
- Flow to the kidneys, liver, stomach, intestines, etc. decrease as exercise intensity increases
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/119/771/a_image_thumb.png?1453509494)
Arterial and venous pO2 at rest vs. during exercise
At rest:
- Less O2 extraction from blood
- More oxygenated blood goes to veins
During exercise:
- Increase in O2 extraction from blood
- For same amount of O2 entering arteries, less O2 goes to veins
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/119/823/a_image_thumb.png?1453511942)
What is CV drift?
A syndrome of CV destabilization during prolonged exercise that occurs w/ high workloads in hot environments
What causes CV drift?
Decrease in preload associated w/ relocation of central blood volume to the skin to dissipate metabolic heat
How does CV drift affect SV and systemic and pulmonary arterial pressure?
- Decreased SV
- Decreased pulmonary arterial pressure
- Decreased systematic arterial pressure
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/125/997/a_image_thumb.png?1453512222)
What are the hemodynamic responses to dynamic exercise?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/126/114/a_image_thumb.png?1453512809)
What are the hemodynamic responses to static exercise?
![](https://s3.amazonaws.com/brainscape-prod/system/cm/177/126/447/a_image_thumb.png?1453512780)
How does plasma volume change w/ training? Significance?
Increased plasma volume makes blood less viscous and easier to flow
How do HR and BP adapt w/ training?
Decreases due to alterations in the balance b/t sympathetic and parasympathetic tone
How does SV adapt w/ training? Why?
Increased SV due to:
- Reduced afterload (aortic pressure)
- Increased diastolic filling time (slower HR)
- Increased pressure of right atrial blood (volume load)
What are the benefits of a slower HR?
Allows more time for diastolic filling and coronary perfusion