Cardiovascular System and Response to Exercise Flashcards Preview

PTRS 825 Final Exam > Cardiovascular System and Response to Exercise > Flashcards

Flashcards in Cardiovascular System and Response to Exercise Deck (26)
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1

End Diastolic Volume

Amount of blood in ventricle at end of ventricular filling
As EDV goes up, better ventricular performance

2

End Systolic Volume

Amount of blood left in ventricles after systole

3

Preload

Amount of blood coming into/getting back to heart
Increased in supine

4

Afterload

What pressure ventricle senses when it contracts
Increased with HTN

5

Contractility

Extent of squeeze
Increases with activity

6

Frank-Starling Mechanism

More blood in ventricles cause greater stretch
Contract with increased force

7

Metabolic-CV-Ventilatory Coupling

1. PA causes increase in O2 demand/CO2 production at cellular level
2. Peripheral circulation dilates
3. CV system increases SV and HR
4. Pulmonary system recruited to increase tidal volume and breathing frequency

8

Cardiac Cycle

Events between 2 heart beats/systole to systole/R wave to R wave
Lasts .9 seconds with HR of 67 bpm

9

Diastole

Relaxation
Low pressure
Ventricles fill with blood
T to QRS

10

Systole

Contraction or "squeeze"
Ventricles expel blood
QRS to T

11

Diastole Function

Ventricular filling
Rapid filling due to pressure difference
Final filling - atrial contraction

12

Systole Function

Isovolumetric contraction - all valves close and close ventricle begins to contract
Ejection phase - outlet valves open
Isovolumetric relaxation - all valves close and pressure falls rapidly

13

Parasympathetic NS

Vagus
SA Node - causes depolarization
In control at rest
Light to moderate PA

14

Sympathetic NS

Epinephrine and Norepinephrine - increased myocardial contractility and blood flow
Near max and max effort

15

Cardiac Regulation

Done by SA node
AV can pace, but slower than SA
AV passes information to bundle of HIS and Purkinje fibers

16

Maximal Oxygen Consumption

Measure of CRF
VO2 Max = SV*HR (Q) * arteriovenous oxygen difference

17

AVO2 Difference

How much oxygen is in arterial system versus how much is left in venous system

18

Cardiac Output

Amount of blood pumped out of heart per unit of time

19

Stroke Volume

Amount of blood pumped by left ventricle with one contraction
EDV-ESV
Increases curvilinearly with work rate until it reach near max (about 50% of aerobic capacity)

20

HR (resting)

Averages 60-80 bpm
Range from 30 bpm to 100 bpm
Can decrease with age (abnormal) but likely to increase due to decreased parasympathetic control
Affected by environmental conditions

21

HR (max)

HR achieved by all-out effort
220-age

22

HR (steady state)

Plateau reaching during constant rate of submit work
Lower steady-state, more efficient the heart

23

HR and Intensity

Increase linearly

24

HR and Training

HR goes down with training due to maximizing stroke volume

25

HR during Submax loads

HR decreases proportionately with amount of training complete

26

HR during Max effort

Remanges unchanged or decreases slightly
Decrease may allow optimal stroke volume