cardiovascular response to exercise Flashcards
Cardiac output
At rest - 5L
During exercise - 25 L
Stroke volume
At rest - 70mls
During exercise - 140mls
Heart rate
At rest - 70bpm
During exercise - 180bpm
Minute ventilation
At rest - 5L/min
During exercise - 200L/min
Respiration rate
At rest - 10 breaths per min
During exercise - 40 breaths per min
Tidal volume
At rest - 0.5 L
During exercise - 4.5L (almost using entire lung capacity)
Cardiovascular response - pre-exercise
Psychological, not a stress response
Hypothalamic drive, sympathetic activation.
Increased HR and stroke volume
Increased vasoconstriction
Increased Adr release (expecting increased metabolism)
Increased muscle blood flow (beta)
Baroreceptor inactivation
Cardiovascular response - early-exercise
Hypothalamic drive, cholinergic, sympathetic activation.
Muscle blood flow increases.
Vasodilation in muscle
Fall in TPR
Baroreceptor activation
HR and SV increase
Vasoconstriction of non-essential beds (spleen)
Cardiovascular response - prolonger exercise
Baroreceptor uncoupling
Chemoreceptor drive
Lung reflex, inspiration increases HR
Vasodilation of skin beds to radiate off heat
Respiratory response - pre-exercise
Not panic, anticipation.
Amygdalar drive
Minute ventikation increases
Stimulus could include muscle K leakage
Repiratory response - during exercise
Joint receptor activation Intercostal muscle spindles Increased pCO2 or decreased pO2 Decreased pH, increased lactate Increased core temperature Increased ventilation
Static exercise
I.e weight lifting (legs not moving)
Vasoconstriction in legs
BP rises dramatically as HR is increased
Cerebral burst at really high levels.
Dynamic exercise
All vasodilated due to metabllites
No big rise in BP even thoigh HR rises
