ventilation and training parameters Flashcards
what’s the gradient across a respiratory membrane on Po2
65mmHg
which values change drastically during heavy exercise?
PO2 in systemic veins (after muscle)
what causes not all HB to be fully loaded
not enough time
Arterial O2 content
20mL O2 / 100mL blood
mixed venous O2 at rest
15-16mL O2 / 100mL blood
mixed venous O2 at exercise
4-5mL O2/ 100mL blood
avo2 diff = 15-16mL O2/ 100mL blood
horses avo2 diff during exercise 23mL/100mL
more hb = more oxygen
have a spleen full of RBC and release hb into blood stream
increase carrying capacity
training and vital capacity
increases with height weight and fat free mass, not affected by physical activity
dead space ventilation
vol of air which is inhaled that doesn’t take part in gas exchange (remains in conducting airways)
anatomic dead space mL
150
what’s more efficient, more breaths or deeper breaths
deeper: greater tidal vol = increased vol of air reaching alveoli per breath (dead space ventilation decreased)
lower respiratory frequency = more time for pulmonary diffusion to occur
training differences in minute ventilation
more H+ more CO2 in less trained = increased ventilation
tidal volume and breathing frequency at max
tidal volume isn’t trained by max respiratory frequency can
breathing patterns and endurance training
slower = increase efficiency
endurance trained people at max have a higher respiratory rate necessary to overcome higher O2 requirement at higher intensity
hyperpnea
O2 cost of increase ventilation
what is oxygen cost of exercise
fraction of VO2 max that goes to muscles.
increases if working at a higher intensity (closer to vo2 max) positive linear relationship
which is greater. max voluntary ventilation or ventilation at max exercise
maximal voluntary ventilation
exercise and respiratory muscle fatigue
inspiratory mouth pressure decreased after exercise = impacts capacity to generate pressure by the mouth
why does max exercise effect respiratory muscles
competition for blood flow
elevated acidity
fatiguing respiratory muscles
cycling to exhaustion at 92% max power
loading muscles (inspiratory resistive) and unloading muscles (assist ventilator)
measure quads twitch force
quads twitch force after fatiguing respiratory muscles
making breathing easier = doesn’t drop as much
making breathing harder = larger drop
peripheral muscle is impacted by breathing
leg blood flow and leg oxygen uptake
measure blood flow and O2 uptake (femoral blood flow)
found harder you breath, less blood goes through legs and less O2 take up
metaboreflex
security system of body
causing reduced blood flow to working muscles via sympathetic vasoconstriction when respiratory muscles are fatigued
