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  • KIN 217

    Chapter3

    CardiorespiratoryEndurance

    2/17/16

  • CardiorespiratoryEndurance

    Theabilityofthebodytoperformprolonged,large-muscle,dynamicexerciseatmoderatetohighlevelsofintensity

    Thisisakeyhealth-relatedcomponentoffitness

    Havinganunderstandingofthebodyprocessesinvolvedincardiorespiratoryenduranceexercisecanhelpyoudesignasafeandeffectivefitnessprogramformanyindividuals

    2/17/16

  • TheCardiorespiratorySystem

    Consistsoftheheart,thebloodvessels,lungsandtherespiratorysystem

    Itsfunctions Deliveryofoxygenandothernutrients

    Removalofcarbondioxideandothermetabolicwaste

    Lacticacid,creatinekinase

    Thermoregulation-surfacetovolumeratio

    Maintenanceofacidbasebalanceandoverallbodyfluid

    balance

    Immunefunction 2/17/16

  • TheCardiorespiratorySystem

    2/17/16

  • TheHeart

    Thehearthasthefollowingcharacteristics:

    4chambers

    Sizeofafist

    Locatedjustbeneaththesternum

    Thesinoatrial(SA)node:isabundleofspecializedcellslocatedintherightatriumthatinitiatestheheartbeat.

    2/17/16

  • TheHeart

    Itsfunctionistopumpbloodthrough2separatecirculatorysystems

    Pulmonarycirculation Rightsideoftheheartpumpsbloodtothelungs

    Systemiccirculation Leftsideoftheheartpumpsbloodthroughtherestofthebody

    2/17/16

  • TheCirculatorySystem

    Heart Pumpsblood

    Arteriesandarterioles Carrybloodawayfromthe

    heart

    Capillaries Exchangeofnutrientswith

    tissues

    Veinsandvenules Carrybloodtowardthe

    heart

    Systemic circuit Pumps oxygenated blood to the

    whole body via arteries

    Returns deoxygenated blood to the right heart via veins

    Pulmonary circuit Pumps deoxygenated blood to

    the lungs via pulmonary arteries

    Returns oxygenated blood to the left heart via pulmonary veins

    2/17/16

  • BloodPressureTheforcesthatcirculatingbloodexertsonthearterialwalls

    BP=CardiacOutput(HRxSV)xTotalPeripheralResistance(TPR)

    2/17/16

  • Therearetwospecificpressuresmeasured

    Systolicbloodpressure(SBP):Heartscontraction

    isthehighestpressurewithinthevascularsystemgeneratedduringcardiaccontraction

    Diastolicbloodpressure(DBP):Heartsrelaxation

    isthelowestpressurewithinthevascularsystemwhentheheartisrelaxed

    BloodPressure

    2/17/16

  • Hypertension

    Hypertension:occurswhentoomuchforceorpressureisexertedagainstthewallofthearteries.

    Riskfactorforcardiovasculardisease(CVD).

    Primaryhypertension:noknowncause

    SecondaryHypertension:causedbyknownendocrinedisorders(Aldosterone)

    Optimal:120mmHg/80mmHg

    Hypertension:140mmHg/90mmHg

    Hypotension:

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