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AEROBIC CAPACITY

AEROBIC CAPACITY. What is Oxygen Uptake? What is VO 2 Max?. OXYGEN UPTAKE - VO 2 amount of oxygen consumed per unit of time (usually 1 minute) expressed as VO 2 mean value at rest = 0.2 to 0.3 l min -1 VO 2 increases proportionally to work intensity

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AEROBIC CAPACITY

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  1. AEROBIC CAPACITY

  2. What is Oxygen Uptake? What is VO2 Max?

  3. OXYGEN UPTAKE - VO2 • amount of oxygen consumed per unit of time (usually 1 minute) • expressed as VO2 • mean value at rest = 0.2 to 0.3 l min-1 • VO2 increases proportionally to work intensity • up to a maximum value - called VO2max

  4. DRAW A GRAPH TO ILLUSTARTE THE DIFFERENCE BETWEEN A TRAINED AND UNTRAINED ATHLETE IN RELATION TO THEIR VO2 MAX

  5. Trained Athlete Untrained Athlete

  6. AEROBIC CAPACITY • the ability to do physical work which is dependant on the aerobic mechanism of energy supply STEADY STATE • the demands of the body for oxygen is balanced exactly by oxygen uptake

  7. FACTORS AFFECTING VO2 MAX • Availability of O2 in the tissue • Is haemoglobin saturated with oxygen at muscle tissue • Varies individual to individual • Myoglobin in muscle cells is fully saturated with O2 (has sufficient recovery time elapsed?) • reduction in VO2max will cause decline in aerobic performance • Age – reduction by 10% per decade • Aerobic training can improve by 10% • Women tend to have greater reductions in VO2 max

  8. DRAW A GRAPH TO ILLUSTARTE VO2 MAX AGAINST AGE FOR TRAINED & UNTRAINED MALES

  9. ONSET OF BLOOD LACTATE ACCUMILATION OBLA • as work intensity increases lactic acid starts to accumulate above resting values • at a certain point this produces muscle fatigueand pain • the resultant low pH inhibits enzymeaction and cross bridge formation • hence muscle action is inhibited • physical performance deteriorates • this point governs the lactic aerobic threshold • trained athletes begin OBLAat higher work intensities and higher values of VO2max than untrained people

  10. FOOD FUEL USAGE FOOD FUEL USAGE • this depends on : • EXERCISE INTENSITY • EXERCISE DURATION SOURCES OF FUELS • main source of CHO for muscular energy during exercise is glucose • derived from stored muscle and liver glycogen • lack of CHO fuel is the limiting factor for aerobic endurance performance • main source of fat for muscular energy during exercise is free fatty acids (FFA) • derived from triglycerides stored as adipose tissue under the skin and in muscle tissue

  11. FOOD FUEL USAGE FOR AEROBIC ACTIVITY

  12. ADAPTATIONS TO AEROBIC CAPACITY • cardiovascular system becomes more efficient • more haemoglobin is created and is available in blood for oxygen transport • pulmonary systems become more efficient • lung volumes increase slightly, greater volumes of air can be breathed per breath • Improved oxygen recovery • Hence reduction in DOMS • More myoglobin is created in muscle cells • More and bigger mitochondriain muscle cells

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