Measurements of Energy Expenditure

Respiratory Exchange Ratio (RER)
1. Ratio of carbon dioxide produced to oxygen consumed
2. Provides information about fuel usage
3. RER = CO2 Expired per Min/O2 Consumed per Min
  1. VCO2/VO2
  2. Value close to 1 = carbohydrates as fuel
    1. Value close to 0.7 = fats as fuel
      1. Value >1 = working anaerobically, more CO2 produced than O2 consumed
4. Requires athlete to be attached to a gas analyser or cycle ergometer so accurate readings can be taken
VO2 Max Test
1. Bleep Test, Harvard Step Test, Cooper 12 min Run
2. Level that is reached can be compared to a chart
3. Sports lab can produce valid and reliable results using direct gas analysis
4. Increasing intensities on a treadmill, cycle ergometer or rowing machine
  1. Tests on treadmill are accurate under lab conditions
    1. Individual runs to exhaustion while air expired is calculated by a computer to see how much carbon dioxide is being expired and how much oxygen is being consumed
Lactate Sampling
1. Taking blood sample and a device analyses the blood & indicates how much lactate is present
2. Accurate, objective, qualitative data
3. Can give an idea of fitness levels
  1. The higher the intensity at which lactate threshold occurs, the fitter the performer
4. Allows performer to select relevant training zones in order to get desired training effect
5. Regular lactate testing provides a comparison to see if improvements have been made
Indirect Calorimetry
1. Measures how much carbon dioxide is produced and how much oxygen is consumed during rest and aerobic exercise
2. Calculating gas volumes means we can find out the main energy source during activity (carbohydrates, fats, etc.)
3. Very reliable and accurate

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Measurements of Energy Expenditure

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	Created by Wesley Spearman about 7 years ago