UMass Amherst KIN 470 - 3:6:14 Kin 470 class notes (2 pages)

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3:6:14 Kin 470 class notes



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3:6:14 Kin 470 class notes

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Pages:
2
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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3 6 14 Kin 470 class notes Hypertension o Resting blood pressure greater than 140 90mmHg o Primary essential hypertension Cause unknown 90 cases of hyper tension o secondary hypertension result of some other condition or disease o Risk factor for Left ventricular hypertrophy Atherosclerosis and heart attack Kidney damage Stroke Effective treatment of high blood pressure o Medications Diuretics beta blockers etc o Regular physical activity o Weight loss o Stress management o Decreased sodium intake o Decreased alcohol consumption Electrical activity of the heart o Heart doesn t need a CNS o Contraction of the heart depends on electrical stimulation of the myocardium o Impulse is initiated in the right atrium and spreads throughout the entire heart o May be recorded on an electrocardiogram ECG Conduction system of the hart ECG interpretation o Records the electrical activity of the heart o P wave Arterial depolarization o QRS complex Ventricular depolarization and arterial repolarization o T wave Ventricular repolarization Relationship between electrical events and the ECG Diagnostic use of the ECG During Exercise o S T segment depression Suggests MI occurred Reduced blood flow to myocardium o Result of atherosclerosis Fatty plaque that narrows coronary arteries Impaired cardiac blood supply o Impaired flow Rate pressure product o An estimate of myocardial work o Rate pressure product SBP HR RPP o A commonly used measure of myocardial work Myocardial Oxygen Use o At rest myocardium uses 70 80 available oxygen o During exercise flow must increase 5 7 fold to meet oxygen demand Vasodilation by o Adenosine o Hypoxia o Sympathetic nervous system hormones Myocardial metabolism Substrate Utilization



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