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Cardiovascular System6
 

Cardiovascular System6

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    Cardiovascular System6 Cardiovascular System6 Presentation Transcript

    • 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
    • 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.
    •  
    •  
    • 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.
    • 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)
    • STROKE VOLUME
    • 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 .
    • CARDIAC OUTPUT
    •  
    • 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
    • Redistribution of Blood Flow During Exercise
    • Redistribution of Blood Flow Local Systemic Vasodilation Vasoconstriction
      • PO2
      • PCO2
      • [H+]
      • adenosine
      • [K+]
      • Nitric oxide
      Metabolites Epinephrine Adrenal medulla Sympathetic Nervous System overrides
    • 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 .
    • Effects of Incremental Exercise on BP
    • Cardiovascular Adjustments to Exercise
    • 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)