Cardiorespiratory responses to ACUTE exercise Flashcards
untrained RHR
6o to 100
trained HR
30 to 40
What is the anticipatory response of HR before exercise
just abouve RHR
vagal tone down
norepinephrine and epinephrine increases
heart rate during exercise is directily proportionl to what
exercise intensity
what is Max HR
highest HR achieved in all out effot to fatigue
it slightly decreases with age. and is highly reproducible
what is hr variability
a mearue of hr rhythmetic fluctuation at rest and during exercise
SV and % Vo2 graph
draw or look up
is supine or stadning SV hiher
Supine
If you have a max HR, hwo can you increase Q
by increasing SV
what causes SV to increase
harder myocardium conttracions and increased force due to norepinephrine binding to receptors
FACTORs that increase SV
increased preload/ventricular strenth and stretch
decreased afterload /
increased contractiliy. increases norep or epinephrine
REsting Q
untrained Q max
Trained Q max
5 L/min
20 L/min
40 L/min
FICk equation calculates what and what is it
the tisssue o2 consumption depending on blood flow
VO2 = Q * (a-v) O2 diff
during endurance exercise what happens to Mean arterial pressure
it inceases
what is systolic bp proportional to
exercise intensity
MAP = equation
TPR * Q
what opens during exercise to increase blood flow
pre capillary sphincters
cardiovascular drift is what
as sv sdrifts down, hr increases to compensate. and maintain Q
this is associated with an increased core temp and dehydration
what are the 2 pressures to determine capillary fluid movement into and out of tissue
hydrostatic … water
oncotic/osmoti….. proteins/electrolyte
what is prioritized in central regulation
blood pressure
ventilation in exercise intermdiate increase
an anticipatory response from central command
what drives the gradual 2nd phase of an increase in ventilation
driven by chemical changes in arterial blood .
what rate does ventilation match
metabolic
what is the ventilatory threshold
point where air breathed > o2 consumed
