Chapter 15
description
Transcript of Chapter 15
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Chapter 15
The Cardiovascular System
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Cardiovascular System Components
• Heart: Pump
• Arteries, Arterioles: Distribution system
• Capillaries: Exchange vessels
• Veins: Collection and return system
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
The Heart
• Myocardium
– Striated lattice-like network
– Functions as a unit
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Functions of the Heart
• Functions of right side– Receive blood returning from body– Pump blood to lungs for gas exchange
• Functions of left side– Receive oxygenated blood from lungs– Pump blood into systemic circulation
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
The Arterial System
• AortaArteriesArterioles
• Vessels have endothelial tissue, smooth muscle, and connective tissue.
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Blood Pressure
• Pressure generated by the pumping action of the heart and the resistance of the blood vessels
• BP = Cardiac output × Total peripheral resistance
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Blood Pressure
• Systole
– Contraction phase
• Diastole
– Relaxation phase
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Blood Pressure Measurement
• Auscultation method– Listen for Korotkoff sounds.– Use a stethoscope and sphygmomanometer.
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Copyright © 2007 Lippincott Williams & Wilkins. McArdle, Katch, and Katch: Exercise Physiology: Energy, Nutrition, and Human Performance, Sixth Edition
Mean Arterial Pressure
• MAP = Diastolic BP + [0.333 (Systolic − Diastolic)]
• Reveals information regarding workload of the heart
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Capillaries
• Microscopic vessels 7 – 10 m in diameter
• Contain 6% of total blood volume
• Walls contain one layer of epithelial cells
• Skeletal muscles have a dense capillary network.
• Myocardium has an even denser network.
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Blood Flow in Capillaries
• Precapillary sphincters regulate flow.
• Capillaries open and flow increases during exercise.
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Venous Return
• One-way valves prevent back flow.
• Veins serve a capacitance role.– At rest, ~ 65% of blood is on the venous side
of the system.
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Varicose Veins• When one-way valves become defective,
blood pools.
• Usually occurs in surface veins– Less musculature to help compress vessels– Occurs most frequently in legs
• Phlebitis– Severe varicose veins with inflammation
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Venous Pooling
• Muscle pump – Prevents pooling and edema– Directs blood back towards the heart
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Hypertension
• Chronically elevated blood pressure
> 140 / 90 mm Hg
• Imposes a strain on the CV system
• It is a prevalent disorder.
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Effective Treatment
• Medications
• Regular physical activity
• Weight loss
• Stress management
• Decreased sodium intake
• Decreased alcohol consumption
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BP Response to Exercise
• Resistance exercise– Straining compresses vessels.– Peripheral resistance increases.– Blood pressure increases in an attempt to
perfuse tissues.
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Steady-Rate Exercise
• Systolic pressure increases with increases in workload.– There is a linear relationship between
workload and systolic BP.
• Diastolic pressure remains fairly constant.
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BP Response to Upper-Body Exercise
• Resistance to flow is increased with upper-body exercise.
• Smaller vessels in upper body compress more easily.
• Care is required for individuals with heart and valve diseases.
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BP in Recovery
• Following endurance exercise, there is a hypotensive response.
• BP temporarily falls below normal resting values.
• Regular exercise may help control moderate hypertension.
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The Heart’s Blood Supply
• Coronary circulation– Right and left coronary arteries branch off the
upper ascending aorta.– RCA supplies predominantly the right atrium
and ventricle.– LCA supplies the left atrium and ventricle and a
small portion of the right ventricle.
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Myocardial O2 Use
• At rest, myocardium extracts ~ 70 – 80% available O2.
• During exercise, flow must increase to meet O2 demand.– Flow may increase 4 – 6 times.
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Effects of Impaired Blood Supply
• Impaired flow usually results in angina pectoris.
• If flow is severely reduced, myocardial infarction may result.
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Rate-Pressure Product: An Estimate of Myocardial Work
• Rate-Pressure Product or Double Product
RPP = SBP × HR
• Is a commonly used measure of myocardial work
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Myocardial Metabolism
• Myocardium has a significantly higher mitochondrial density compared with skeletal muscle.
• This allows the heart to utilize– Glucose– Fatty acids– Lactate
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Myocardial Metabolism
• Endurance exercise training increases the ability to use lactate and fatty acids for fuel.
• Decrease reliance on CHO
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