CHAPTER 7 Lesson 3 & 4

LESSON 3 INFLUENCES ON CARDIORESPIRATORY ENDURANCE How is cardiorespiratory endurance measured?  Maximal oxygen consumption or VO2max  The largest amount of oxygen your body is able to process during strenuous aerobic exercise.  Measures the amount of oxygen in milliliters per kilogram of body weight per minute.  The more aerobically fit you are, the higher your VO2max  We will calculate this next class

WHAT FACTORS INFLUENCE CARDIORESPIRATORY ENDURANCE?  Age  Heredity  Gender – males have higher hemoglobin and less body fat  Slow-twitch fibers (red fibers)  Muscle fibers that contract at a slow rate  Better oxygen supply  Long distance running  Fast-twitch fibers (white fibers)  Contract rapidly allowing for greater muscle strength  Powerful, but little oxygen supply  Sprints, jumps, explosive movements

 Body Composition  More body fat, reduces aerobic capacity  Need more muscle/less fat – burn more calories  Level of Conditioning  If your are not currently active, start!  Benefits of Cardiorespiratory Fitness  Figure 7.5 pg. 210  Heart & lungs, Blood and Arteries, Muscle Cells and bones, Body composition, Emotions, Image & Lifestyle

 Make the most of what you have  Start young  Stay active  Pay attention to fitness factors you can control  Weight  Body composition  Level of conditioning  Make your body work for you, rather than against you  Aerobic exercise conditions your muscles & burns fat, helping control blood fat levels.

LESSON 4 AEROBIC VS. ANAEROBIC PHYSICAL ACTIVITIES  Anaerobic activity  Activity that requires high levels of energy and is done for only a few seconds or minutes at a high level of intensity. Leads to:  Anaerobic fitness  Higher levels of muscular strength, muscular endurance, and flexibility  Anaerobic Activities  Running up stairs, 40 yard sprint, fast break in basketball.

 Interval Training  A program in which high-intensity physical activities alternate with low-intensity recovery bouts for several minutes at a time Advantages:  Work at higher intensities  Burn more calories  Increases ability to work at higher intensities  Improves skill-related and health related fitness simultaneously