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Cardiovascular Responses to Exercise

Cardiovascular Responses to Exercise. Increased Q. Increased HR and SV Enhanced delivery of O 2 and fuels to active muscle and removal of CO 2 and waste. Increased Skin blood flow. Remove heat. Decreased blood flow to the kidneys. Decreased urinary output and maintenance of blood volume.

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Cardiovascular Responses to Exercise

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  1. Cardiovascular Responses to Exercise

  2. Increased Q • Increased HR and SV • Enhanced delivery of O2 and fuels to active muscle and removal of CO2 and waste

  3. Increased Skin blood flow • Remove heat

  4. Decreased blood flow to the kidneys • Decreased urinary output and maintenance of blood volume

  5. Decreased visceral flow • Reduced GI activity

  6. Maintenance or slight increase in brain blood flow

  7. Increased blood flow to coronary arteries

  8. Increased muscle blood flow • Maximal flow is limited by need to maintain BP • Active muscles will vasoconstrict if BP is not maintained

  9. CV regulation directed to maintain BP • Balance between maintaining BP and need for more blood to active tissue

  10. Limits of CV Performance • VO2 max is best predictor of CV capacity • Biochemical factors are better predictor of endurance • Q is the best predictor of VO2 max • Q can increase by 20% from endurance training, accounts for most of improvement of VO2 max

  11. CV changes with training • Improved ability to pump blood, increase SV (↑ EDV, small incr. L ventricular mass) • No change in ventricular volume • ↑ SV, ↓ HR = more efficient pressure-time relationship • May increase VO2 max by 20%, depending on initial fitness (endurance more) • Submax and resting HR are lower

  12. SV increase no more than 20% (increased myocardial contractility) • Slight increase in (a-v)O2, right shift in dissociation curve • Resting and submax. BP and MAP are lower

  13. Coronary blood flow decreases at rest and submax work • Increased SV and decreased HR = reduce myocardial oxygen consumption • No change in the vascularity of the heart • Skeletal muscle vasularity increases • (decreased blood flow during submax work)

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