Measurements Of Energy Expenditure Flashcards

1
Q

Indirect calorimetry

A
  • measures an estimate of energy expenditure through gas exchange
  • measures how much Co2 is produced & how much o2 is consumed at both rest and during aerobic exercise
  • calculation the gas volumes enables us to find out the main substrate being used (carbs / fats)
  • accuracy of the test is reliable - gives precise calculation of the Vo2 max
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2
Q

Lactate sampling

A
  • take a tiny blood sample and hand held device will analyse the blood and indicates how much blood lactate is present
  • accurate and objective
  • means of measuring exercise intensity, the higher the intensity at which the lactate threshold occurs the fitter the athlete is.
  • allows performer to select training zones - measured in HR or Power
  • regular lactate testing: comparison to see improvement.
  • if the results show lower lactate levels at the same intensity = increased peak power/speed, time to exhaustion, recovery HR and higher lactate threshold.
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3
Q

Vo2 max test

A
  • multi stage fitness test, Harvard step test and the cooper 12 minutes run - gives indications or predictions of the Vo2 max
  • sports science laboratory = more valid and reliable results using direct gas analysis
    -> increasing intensities on treadmill, cycle ergometer or rowing machine
    -> air that is expired is calculated by computer software
    -> vo + conc of o2 is compared with the % of o2 that is in the atmospheric air = see how much o2 used in the task.
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4
Q

Respiratory exchange ratio (RER)

A

RER = ratio of Co2 produced compared to o2 consumed + a measure of exercise intensity
- info on fuel usage during Ex, e.g. fats, carbs + protein (all can be oxidised to produce energy)
- for a certain vol of o2, energy released will depend on the energy source.
- calculating the RER determines which En source is being oxidised + whether the performer is working aerobically or anaerobically.

Procedure: athlete attached to gas analyser on treadmill or cycle ergometer

RER = Co2 expired per minute (VCo2) / o2 consumed per minute (Vo2)

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5
Q

RER - what values of RER show that carbs and fats are the fuel source for that exercise

A

RER value close to 1 = using carbs
RER value approx 0.7 = fats
RER value greater than 1 = anaerobic respiration, more Co2 being produced than o2 consumed

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