measurements of energy expenditure (energy systems) Flashcards
4 ways to measure energy expenditure
indirect calorimetry
lactate sampling
vo2 max test
RER
what is indirect calorimetry?
a technique that provides an accurate estimate of energy expenditure through gas exchange
what does indirect calorimetry measure?
how much carbon dioxide is produced and how much oxygen is consumed at both rest and during aerobic exercise
why is indirect calorimetry good?
accuracy of test is reliable and gives a precise calculation of oxygen consumption and VO2 max
what is lactate sampling?
involves taking a tiny blood sample and handheld device analyses the blood and indicates how much lactate is present
what does lactate sampling measure?
how much lactate is present
exercise intensity
lactate sampling + exercise intensity
the higher the exercise intensity at which the lactate threshold occurs, the fitter the athlete is considered to be
what happens if a lactate sampling test shows a lower lactate level at the same intensity of exercise?
should indicated that the performer has an increase in peak speed/power, increased time to exhaustion, improved recovery heart rate and finally a higher lactate threshold
what are different types of vo2 max tests?
bleep test
harvard step test
coopers 12 min run
best one is : direct gas analysis
direct gas analysis (vo2 max tests)
measures the concentration of oxygen that is inspired and the concentration of carbon dioxide that is expired
cycle ergometer(vo2 max tests)
a stationary bike that measures how much work is being performed
RER
respiratory exchange ratio
the ratio of carbon dioxide produced compared to oxygen consumed and is used as measure of exercise intensity
what does RER do?
provides info about fuel usage during exercise
how do you calculate RER?
RER = carbon dioxide expired per minute / oxygen consumed per min
RER value close to 1
performer using carbohydrates
