cardiorespiratory endurance fahey/insel/roth, fit & well: core concepts and labs in physical...
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Cardiorespiratory Endurance
Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Cardiorespiratory System
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Quiz Time!
Compared to sedentary people, those who engage in regular moderate endurance exercise are likely to: A. Have fewer colds. B. Be less anxious and depressed. C. Fall asleep more quickly and sleep better. D. Be more alert and creative.
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Oh no…we’re not done:
About how much blood does the heart pump each minute during aerobic exercise (in quarts)?
True or false: During an effective 30-minute cardiorespiratory endurance workout, you should lose 1-2 pounds.
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Cardiorespiratory SystemThe heart
Right side pumps blood in the pulmonary circulation
Left side pumps blood in the systemic circulation
Blood pressure Systole—contraction Diastole—relaxation
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Circulation in the Heart
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Cardiorespiratory SystemBlood vessels
Arteries = vessels that carry blood away from the heart
Veins = vessels that carry blood to the heart Capillaries = very small blood vessels that
distribute blood to all parts of the body
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Respiratory System
Alveoli = tiny air sacs in the lungs through whose walls gases such as oxygen and carbon dioxide diffuse in and out of the blood
Lungs expand and contract about 12–20 times a minute
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Cardiorespiratory SystemAT REST Heart rate: 50–90
beats/minute Breathing rate: 12–20
breaths/minute Blood pressure: 120/80 Cardiac output: 5
quarts/minute Blood distributed to
muscles: 15–20%
DURING EXERCISE Heart rate: 170–210
beats/minute Breathing rate: 40–60
breaths/minute Blood pressure: 175/65 Cardiac output: 20
quarts/minute Blood distributed to muscles:
85–90%
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Energy Production
Metabolism— the sum of all chemical processes necessary to maintain the body
Energy from food Carbohydrates are broken down into glucose
(simple sugar) Stored as glycogen or fat, if glycogen stores are
full and energy needs are met. ATP (adenosine triphosphate): The energy
“currency” of cells; basic form of energy
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Three Energy Systems
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Three Energy Systems
SOURCE: Edington, D. W., and V. R. Edgerton. 1976. The Biology of Physical Activity. Boston: Houghton Mifflin. Used by permission.
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Benefits of Cardiorespiratory Endurance Exercise Improved cardiorespiratory function Improved cellular metabolism Reduced risk of chronic disease
Cardiovascular disease Cancer Type 2 diabetes Osteoporosis Deaths from all causes
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Cardiorespiratory Fitness and Risk of Death
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Benefits of Cardiorespiratory Endurance Exercise
Better control of body fatImproved immune functionImproved psychological and emotional
well-being
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Effects of Cardiorespiratory Endurance
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Fahey/Insel/Roth, Fit & Well: Core Concepts and Labs in Physical Fitness and Wellness, Chapter 3© McGraw-Hill Higher Education
Assessing Cardiorespiratory Fitness
Field tests for maximal oxygen consumption: The 1-mile walk test The 3-minute step test The 1.5-mile run-walk test
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Monitoring Your Heart Rate Carotid artery in the neck Radial artery in the wrist
Count beats for 10 seconds and multiply the result by 6 to get rate in beats per minute
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Developing a Cardiorespiratory Endurance Program
Setting goalsApplying the FITT equation
Frequency Intensity Time Type of activity
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Frequency of Training
Train 3–5 days per week Beginners should start with 3 and work up
to 5 days per week
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Intensity of Training Target heart rate zone
Estimate your maximum heart rate (MHR)• 220 – your age = MHR
Multiply your MHR by 65% and 90%• People who are unfit should start at 55% of MHR
Example: 19-year-old • MHR = 220 – 19 = 201
• 65% training intensity = 0.65 X 201 = 131 bpm
• 90% training intensity = 0.90 X 201 = 181 bpm
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Intensity of Training Ratings of perceived exertion (RPE)
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Time (Duration) of Training
Total of 20–60 minutes is recommendedOne single session or multiple sessions of
10 minutes or moreDifferent intensity levels require different
durations High-intensity activity = 20 minutes Low-to-moderate-intensity activity = 45–60
minutes
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Warming Up and Cooling Down
Warming Up (5–10 minutes) Muscles work better when warmed up Redirect blood flow to working muscles Spread synovial fluid
Cooling down (5–10 minutes) Blood flow and respiration return to normal
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Cardiorespiratory Endurance: FITT
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Building Cardiorespiratory FitnessRate of improvement depends on age,
health status, initial level of fitness, and motivation
Initial phase (1–4 weeks): 3–4 days per week, low end of target heart rate zone, 20–30 minutes
Improvement phase (2–6 months): 3–5 days per week, middle to upper end of target heart rate zone, 25–40 minutes
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Maintaining Cardiorespiratory Fitness
Continue to exercise at the same intensity on 3 nonconsecutive days per week
If you have to stop, start the program again at a lower level
Cross-training maintains motivation
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Hot Weather and Heat Stress
Dehydration = excessive loss of fluidHeat cramps = sudden development of
muscle spasms and pain Heat exhaustion = heat illness related to
dehydration from exertion in hot weatherHeat stroke = a severe and often fatal heat
illness characterized by significantly elevated core body temperature
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Preventing Heat Illness Use caution in high heat or humidity (over
80°F and/or 60% humidity); lower your intensity and/or add rest breaks
Exercise morning or evening Drink plenty of fluids; check weight before
and after exercise Avoid supplements and beverages containing
stimulants Wear clothing that “breaths” Slow down or stop if you feel uncomfortable
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Poor Air Quality
Poor air quality can decrease exercise performance; it especially affects those with respiratory problems
Do not exercise outdoors during a smog alert or if air quality is poor
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Exercise Injuries Consult a physician for serious injuries and those
that do not improve within a reasonable amount of time
Managing minor exercise injuries: RICE Rest Ice Compression Elevation