Student%20Lecture%2011%20%28Cardiovascular%20-Chronic%20Exercise%29

Student%20Lecture%2011%20%28Cardiovascular%20-Chronic%20Exercise%29

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Unformatted text preview: Lecture 11 Lecture Cardiovascular Chronic Exercise/Measurements Thursday 2­16­10 Announcements Outline Outline – Grant Assignment #2 – Extra Credit Quiz #6 Lecture Chronic Exercise Discussion VO2 testing February 19th, 1:30, Armstrong B061, Anne Cox, Illinois State University, “Physical education motivation: Do different reasons really matter” What happens to resting and submaximal heart rate after chronic exercise training? exercise Why? Heart rate Heart Sedentary Exercise Trained Heart rate Rest Max Workload Mechanisms underlying reduced resting and submax HR resting Sed 70ml/beat Trained 100ml/beat Sed 110ml/beat Trained Rest Max Exercise 180ml/beat Why does stroke volume increase as a result of chronic endurance exercise training? exercise Mechanisms underlying increased stroke volume after endurance exercise training exercise Mechanisms underlying increased stroke volume after endurance exercise training (cont.) exercise Sedentary Exercise Trained MAP Rest Max Workload What happens to resting and submaximal cardiac output after chronic exercise training? chronic Why? Cardiac Output Cardiac Cardiac Output Sedentary Exercise Trained 22 L/min 35 L/min 5 L/min Rest Max Workload How does chronic endurance exercise training increase maximal a-vO2 difference? maximal Arterial Venous Oxygen Content Arterial Sedentary Exercise Trained Oxygen Content arterial venous Rest Max Workload Mechanisms for Increased Oxygen Extraction (Capillaries) Sedentary Trained Sedentary Trained Mechanisms for Increased Oxygen Extraction (Mitochondria) Extraction Sedentary Trained Which variable in the Fick equation does endurance exercise training influence most? VO2 = CO x a-vO2 difference VO Contribution of CO & a-vO2 diff Contribution Exceptions Subject 1 Pre Post Subject 2 Pre Post 3.07 4.41 205 186 122 146 23.9 26.6 126 166 VO2max 3.58 4.53 HRmax 206 205 SVmax 124 149 COmax 25.5 30.5 a­vO2 diff 140 149 What functional and structural adaptations occur to the vasculature with chronic endurance exercise training? endurance Functional Adaptations of Vasculature (1 week) Vasculature Relaxation (%) Exercise trained Sedentary Relaxation (%) Exercise trained Sedentary Endothelium Dependent Vasodilator Endothelium Independent Vasodilator Functional Adaptations of Vasculature (16 weeks) Vasculature Relaxation (%) Exercise trained Sedentary Relaxation (%) Exercise trained Sedentary Endothelium Dependent Vasodilator Endothelium Independent Vasodilator What happened between weeks 1 and 16 that would explain the loss of the beneficial effects of exercise on endothelial function? endothelial Structural Adaptations of Vasculature Vasculature Sedentary 1 week 16 week How do we measure VO2max in a How 2max laboratory setting? laboratory What is specificity of exercise and how does it relate to graded exercise testing and VO2max? testing What type of screening should be done before a graded exercise test? done What baseline measurements should be taken prior to graded exercise test? test? What are the four criterion typically used to determine if VO2max has been used obtained obtained What is the difference between VO2peak and VO2max? VO ...
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This note was uploaded on 02/17/2011 for the course HK 458 taught by Professor Newcomer during the Spring '10 term at Purdue.

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