CV Limitations To Exercise Flashcards
Fick’s principle
VO2 = Q x a-vO2 diff
PaO2= arterial O2 pressure
Normally=
100 mmHg
Normal arterial O2 content in W and M:
17-20 ml of O2/dl
170-200 ml/L of blood
Working skeletal muscles account for more than % of energy spent during exercise
90
Heat stress drastically reduces VO2max by accelerating declines in …(2) Leading to decrements in …(3)
Q
MAP
Locomotive skeletal blood flow
O2 delivery
O2 uptake
Gonzalez-Alonso & Calbet first study to demonstrate that …(4) decline significantly during exhaustive maximal aerobic exercise in humans
Q
Locomotive muscle blood flow
MAP
Systemic and locomotive muscle O2 delivery
Q and O2 transport to the locomotive muscles can longer be maintained
Despite the skeletal muscle remaining below its maximal capacity to consume oxygen
Contribution of muscle O2 conductance in limiting locomotive muscle VO2 during whole-body exercise in trained humans is…
Very small
Decline in stroke volume during heavy exercise could be related in part to…(2) that accompanies severe tachycardia
Left ventricular filling time
Left ventricular end-diastolic volume
Mitochondrial oxidative capacity exceeds widely…
Maximal O2 supply by CV system
Cerebral VO2=
Cerebral blood flow X a-vO2 difference
> HR X
Law governing the cardiovascular system
Pressure gradient = Flow x Resistance
MAP-RAP= Qx TPR
