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hayley Yudelman

LimitationsMaximumOxygenConsumption - 0 views

    • hayley Yudelman
       
      History of VO2 max
  • The idea that the human body cannot survive without oxygen has been known for millennia. However, the notion that oxygen and its delivery and subsequent metabolism by exercising muscles is crucial to prolonged activity is relatively new, having first gained attention in the 1920s with the work of the English physiologist A. V. Hill.
  • The term "maximal oxygen uptake" was first coined by Hill and Herbst in the1920s.
  • ...9 more annotations...
  • s limited by the ability of the cardiorespiratory system to transport oxygen to the working muscles [1 ].
  • Christensen [2] noted that there was a large variation in the heart rate response to exercise between subjects and that those subjects who performed regular physical activity typically had lower heart rates at a fixed workload as compared to their untrained counterparts.
  • The study revealed that aerobic training led to a decrease in submaximal heart rate without a change in cardiac output.
  • The larger hearts were attributable to hypertrophy of the left ventricle, which was a result of chronic aerobic training [2].
    • hayley Yudelman
       
      How Max. Oxygen works
  • experiments carried out in the 1950s and 60s actually measured such variables through intrusive, surgical means.
  • While early studies concluded that the size of a person's heart was largely dependent on training status and subsequently was an accurate determinant of aerobic performance, these conclusions lacked substantial concrete evidence.
  • Procedures now allowed for the measurement of oxygen content in the arterial blood as well as oxygen content in the venous blood which could be used to extrapolate how much oxygen was extracted by the working muscles at the cellular level.
  • for muscle contraction.
  • he question then arises: what defines a fit person? At this particular point in time, most agree that aerobic capacity is the best indicator of overall fitness. As the field of exercise physiology evolves, this idea may change or it may remain the same. Occasional paradigm shifts are to be expected in a field as young and imperfect as exercise physiology.
Gran Trabajo

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Gran Trabajo

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hayley Yudelman

Prevent Disease.com - VO2 Max: How Fit Is An Athlete? - 0 views

  • o perform the test, all you need is your weight and age and to walk one mile. Before the walk, warm up with some stretching. After the warm up, walk one mile as fast as possible and note the time it took you. Immediately after finishing the mile, take your pulse. The equation for estimating your VO2/Kg follows: VO2 max (ml/kg/min) = 132.853 - 0.0769 (weight) - 0.3877 (age) + 6.3150 (sex) - 3.2649 (time) - 0.1565 (heart rate) Weight is in pounds. Age is in years. Sex: male = 1, female = 0. Time is expressed in minutes and 100ths. Heart Rate is in beats per minute, taken at the end of the walk. Notice how gender adds a constant 6.3 to the male score.
    • hayley Yudelman
       
      How to test VO2 max
  • The supply of oxygen is dictated by how often the heart beats, the volume of blood transported by every beat and the amount of oxygen in that blood.
  • It is also dependent on how well the tissue or muscle extracts the oxygen (O2).
  • ...1 more annotation...
  • So if we could find the volume of blood pumped in one minute and the difference between the amount of oxygen in arterial and venous blood we would have all the data we need.
    • hayley Yudelman
       
      How the max oxygen works
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