Cardiovascular responses to exercise part 1 Flashcards
Cardiac output
amount of blood pumped by heart during a 1 min period (SV x HR)
what do CV responses to aerobic exercise depend on?
intensity
duration
steady state exercise
when energy expenditure provided for exercise is balanced with energy required
Q is the most important factor for increasing ____ consumption during exercise
oxygen
what is the anticipatory response to do with Heart rate
where pre exercise HR is greater than resting heart rate because of the release of norepinephrine and decrease in vagal tone
what is the steady state HR
optimal HR for meeting circulatory demands at a specific work rate
what does steady state HR indicate
heart efficiency and fitness level
Frank starling mechanism
increase in LVEDV and increased preload and increased SV
increased contractile force = ____ ejection fraction
increased
when comparing a trained to an untrained individual at rest, who has the greatest
a) Q
b) HR
c) SV
a) not much difference
b) untrained
c) trained
when comparing a trained to an untrained individual at max exercise who has the greater
a) Q
b) HR
c) SV
a) trained
b) similar but slightly lower in athlete
c) trained
Blood flow increases to what places during exercise
CNS
heart
muscle
skin (or stays the same)
blood flow decreases to what places during exercise
Kidney
Spleen
Liver
GI tract
why does pH drop with exercise?
build up of H+ ions and lactic acid
why does hematocrit increase during exercise
loss of blood plasma
CV responses to Sub-maximal exercise?
Q, HR, SV, RPP all increase until steady state,
DBP has no change, SBP increases, MAP increases slightly
TPR decreases
true or : During exercise, SBP rises to a greater extent than Q, and this causes TPR to decrease.
false because Q rises higher than SBP
at rest, a-vO2 difference is?
6 ml of O2
how much O2 is in 100 ml of blood in the arteries and in the veins at rest
20 ml in the arteries
14 ml in the veins
what happens to plasma volume at moderate exercise
decreases
what is the reason for decrease in plasma volume during moderate exercise
fluid shifts
what is the reason for decreased plasma volume in prolonged exercise
blood volume is reduced by loss of water through sweating
what happens in cardiovascular drift
cardiac output remains fairly constant, SV decreases, HR increases
