Week 10 - Cardiovascular control during exercise Flashcards
CV response to acute exercise (5)
- HR increases as intensity increases up to Max HR
- SV increases 40% - 60% VO2max in untrained and max in trained
- Increase HR and SV causes increase Q
- Blood flow and BP change
- Designed to maintain adequate blood flow to brain
RHR
- Average bpm
- How does age, fitness affect it?
- 60-80 bpm
- Increase with age, decrease with fitness
- Affected by temperature
MHR
equation
HRmax=220-age or 208-(0.7 x age)
SV steps (4)
- Venous return
- Ventricular distensibility(Preload)
- Ventricular contractility
- Afterload
SV increases during exercise due to (3)
- Frank Starling mechanism
- Increased ventricular contractility
- Decreased TPR due to increased vasodilation of blood vessels to active muscles
Cardiac output resting value (L/min)
5 L/min
Q with exercise________ directly with _____ ______ _____ to maximal values of around ________ L/min
Increases increasing exercise intensity 20-40 L/min
Q magnitude of increase varies with_____ (2)
Body size
Endurance training
Cardiovascular drift occurs (2)
- Steady state prolonged exercise/exercise in hot environment.
- Decrease in SV and sytemic and pulmonary arterial pressures and increase in HR
BP during cardiovascular endurance exercise
SBP
DBP
- SBP increases direct proportion to increases exercise intensity
- DBP little or no change regardless of intensity
Factors that influence ABP
Increases in: (5)
Blood volume HR SV Peripheral resistance Blood viscosity
Arterial-Venous Oxygen Difference definition
(a-vO2 diff mLO2/100mL
blood)
-Amount of O2 extracted from the blood as it travels through the body
-Difference between O2 content of arterial blood and venous blood
Arterial-Venous Oxygen Difference_____with exercise
increases
Blood plasma volume is______ with the onset of exercise
reduced
Sweating during exercise causes a _____ in BP
loss
