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Aiguë (court terme) et les réponses chronique (long terme): réponses cardiovasculaires

  • Notes d'étude
  • Révisions du sujet
    Zachary B.
    US
    Zachary B.

    What are some short term and long term cardiovascular responses?

    Rk S.
    IN
    Rk S.

    Acute (short term) and chronic (long term) responses: cardiovascular responses Cardiovascular responses Cardiac output(Q): Q = stroke volume x heart rate. At rest, the Q is 5-6 l/min. This increases to 30 l/min. at maximum intensity Stroke volume: The amount of blood pumped each beat is approximately 80 ml. This increases to 100-120 ml at maximum output. Remember though that this maximum output is achieved at approximately 40% of VO2 max. (this equates to an intensity that just enables you to talk while you are running) Heart rate: This increases linearly with exercise. Cardiac output is primarily produced by heart rate (certainly at higher intensities) as stroke volume peaks submaximally Venous return: This increase is due to increased muscular contraction, which is largely responsible for getting venous blood back to the heart Blood flow to working muscles: At rest, 15-20% of total blood flow goes to muscles. At maximal intensity this increases to 85-90% Oxygen differences between blood in the arteries and veins (click for details). A-VO2 difference: At rest, the difference in oxygen between the arteries and the veins is approximately 7 ml per 100 ml of blood. This increases with exercise up to 21-28 ml per 100 ml, as the muscles require more oxygen Blood pressure: The greatest increase is in systolic blood pressure, due to stroke volume and heart rate increases as well as vasodilation of the artieries.

    Muhammad S.
    PK
    Muhammad S.

    Explain cardiovascular response.

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