measurements of energy expenditure (energy systems) Flashcards

1
Q

4 ways to measure energy expenditure

A

indirect calorimetry
lactate sampling
vo2 max test
RER

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2
Q

what is indirect calorimetry?

A

a technique that provides an accurate estimate of energy expenditure through gas exchange

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3
Q

what does indirect calorimetry measure?

A

how much carbon dioxide is produced and how much oxygen is consumed at both rest and during aerobic exercise

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4
Q

why is indirect calorimetry good?

A

accuracy of test is reliable and gives a precise calculation of oxygen consumption and VO2 max

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5
Q

what is lactate sampling?

A

involves taking a tiny blood sample and handheld device analyses the blood and indicates how much lactate is present

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6
Q

what does lactate sampling measure?

A

how much lactate is present
exercise intensity

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7
Q

lactate sampling + exercise intensity

A

the higher the exercise intensity at which the lactate threshold occurs, the fitter the athlete is considered to be

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8
Q

what happens if a lactate sampling test shows a lower lactate level at the same intensity of exercise?

A

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

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9
Q

what are different types of vo2 max tests?

A

bleep test
harvard step test
coopers 12 min run

best one is : direct gas analysis

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10
Q

direct gas analysis (vo2 max tests)

A

measures the concentration of oxygen that is inspired and the concentration of carbon dioxide that is expired

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11
Q

cycle ergometer(vo2 max tests)

A

a stationary bike that measures how much work is being performed

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12
Q

RER

A

respiratory exchange ratio
the ratio of carbon dioxide produced compared to oxygen consumed and is used as measure of exercise intensity

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13
Q

what does RER do?

A

provides info about fuel usage during exercise

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14
Q

how do you calculate RER?

A

RER = carbon dioxide expired per minute / oxygen consumed per min

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15
Q

RER value close to 1

A

performer using carbohydrates

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16
Q

performer using carbohydrates
(RER)

A

RER value close to 1

17
Q

RER value of approx 0.7

A

performer using fats

18
Q

performer using fats
(RER)

A

RER value of approx 0.7

19
Q

RER value greater than 1

A

anaerobic respiration so more CO2 produced than O2 consumed

20
Q

anaerobic respiration so more CO2 produced than O2 consumed
(RER)

A

RER value greater than 1