Cardiovascular System6

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  • 1. CVS changes during Exercise
    • The Cardiovascular system changes to match supply and demand.
    • Components of the CV system during exercise
      • heart rate
      • strove volume
      • cardiac output
      • blood flow
      • blood pressure
  • 2. Heart rate
    • Measure at the radial or carotid site.
    • Reflects the amount of work that it is performing to meet the demands of the body with increasing work.
    • Resting HR: 60 to 80 bts/min.
      • Anticipatory response-prior to starting exercise just knowing that you are going to have to start exercise.
      • 220-age= predicted Max HR.
  • 3.  
  • 4.  
  • 5. Change in HR during Exercise
    • As exercise begins, Para-SNS withdraws influence.
    • SNS stimulates heart.
    • Adrenal gland secretes catecholamines.
    • Increase in body temperature ,as in intense exercise.
  • 6. Stroke Volume  May increase with increasing rates of work up to intensities of 40% to 60% of maximum exercise.  May continue to increase up through maximal exercise intensity, generally in highly trained athletes
    • Depends on position of body during exercise
      • upright-SV is less, supine is greater (easier to heart)
  • 7. STROKE VOLUME
  • 8. Cardiac Output
    • Resting is 5.0 L/min-
    • 20 to 40 L/min during exercise.
    • The need for an increase is to meet the muscle’s demands during exercise.
    • An increase in HR and SV increases Q, (separate or together)
    • After 40 to 60% of max, SV plateaus, Q increases due to increase in HR .
  • 9. CARDIAC OUTPUT
  • 10.  
  • 11. Redistribution of Blood Flow
    • Blood flow to tissues is controlled in relation to tissue needs
      • Tissue needs may  20-30 fold, but cannot  Q that much: 5 L/min  100 -150 L/min ! ? So flow is redistributed between tissues
    • Muscle blood flow  to working skeletal muscle
    • Splanchnic blood flow  to less active organs
      • Liver, kidneys, GI tract, & also to non-working muscle
  • 12. Redistribution of Blood Flow During Exercise
  • 13. Redistribution of Blood Flow Local Systemic Vasodilation Vasoconstriction
    • PO2
    • PCO2
    • [H+]
    • adenosine
    • [K+]
    • Nitric oxide
    Metabolites Epinephrine Adrenal medulla Sympathetic Nervous System overrides
  • 14. Blood pressure during endurance activities
    • SBP increases in proportion to exercise intensity.
    • DBP changes very little during endurance exercise.
    • There is modest increase in mean arterial pressure .
  • 15. Effects of Incremental Exercise on BP
  • 16. Cardiovascular Adjustments to Exercise
  • 17. Cardiac Output Components in Trained & Untrained Subjects Untrained Rest 70 72 5.0 Max Exercise 195 113 22.0 Endurance Trained Rest 50 100 5.0 Max Exercise 195 179 35.0 Heart rate Stroke volume Cardiac output Subject/Activity (beats/min) (ml/beat) (L/min)