cardio intregation in exericse and mental health Flashcards
CVRS responses during exercise
local vasodilation in the muscles that are being exercised
- exercise reflex
- cortical influences (central commands)
types of exercise
dynamic and static
what is dynamic exercise
running, joggning
what is static exercise
isometric
- hand grip, holding weights, pushing
what happens to O2 consumption during dynamic exercises
increases as the exercise increased
- then reaches plateau phase as the max o2 is reached
- anerobic respiration gives extra O2
how does HR and SV change during dynamic exercise
both increases, leading to increase in ventilation and CO
where does the majority of CO go to during exercising muscles
to exercising muscles and cardiac muscle
what happens to DP and SP and MAP during dynamic exercise
SP and MAP increases but DP decrease due to vasodilation so the TPR decreases as well
what is the vasodil counteracted by
contraction by the muscles which cause vaso con
- but balances with each other leading to increased blood flow
what is exercise reflex
where it increases respiration, contractility, symp activity (vaso con increase)
-
how is the exercise reflex initatied
where afferent activity is sent to the subthalamic locomotor area in the hypothalamus from the mechanoreceptors
where does the exercise relfex occur in
vaso con in GIT, kidney, skin, all skeletal muscles
inexercising muscles, does exercise reflex happen
it does but dominated by excerise hyperaemia
- this is called fucntional sympatholysis
what is exercise hyperaemia
vasodilation during exercise
- to increase mucsle blood flow
what happens to the set point in the baroreceptor reflex
increased to maximise O2 perfusion
what is thermoregulatory reflex and how does it happen
body temp increases which leads to vasodilation in the skin
- decrease in DP and ABP and in SNS activity
are chemoreceptors involved in exercise
after reaching anaerocbi cthreshold, pH de reases
- deteched by the chemoreceptors, this increases ventilation so increase PO2 and decrease PCO2
what happens to exercise hyperaemia during static exercise
overcome by mechanical compression
- exercise hyperaemia happens after the exercise to increase the muscle blood flow
what is activated when theres stress in the exercise like its important to life
the alerting or defence repsonse
- (fight/flight/frigght)
responses to mental stress during exercise
increase respiration, SNS activity, CO, vasocon, HR, blood flow to muscle, TPR
decrease vasodil,
what is suppressed during alert or defence reflex
baroreceptor refelx
-so the ABP doesnt decrease and can reach very high values
