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Research Techniques in Nutrition and Exercise > Energy Expenditure > Flashcards

Energy Expenditure Flashcards

1
Q

How can we measure EE?

A

Indirect and Direct calorimetry.

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2
Q

What are examples of Direct Calorimetry?

A

A calorimetric chamber – a sealed chamber in which a person must remain during the measurement. We can directly measure the heat given off by the human body during activity or at rest by using

Heart rate: Relies on linear
relationship between
HR and O2 consumption
• Only appropriate for ex
intensities 41 – 80% VO2 Max.
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3
Q

How much energy liberated from food is used to produce ATP?

A

40%

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4
Q

How much energy converted from food is used to produce heat?

A

60%

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5
Q

What are the predictive equations to estimate EE?

A
  • Schofiled equation.
  • Mifflin-St Joer
  • Harris Benedict
  • Owen
  • WHO/FAO/UNU
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6
Q

As we cannot measure heat what other ratio do we measure in Indirect calorimetry?

A

Ratio of O2 consumed to C02 Produced.

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7
Q

What is Indirect Calorimetry based on?

A

Based on gaseous exchange. O2 and C02.It estimates total body EE bas on O2 used and C02 produced.

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8
Q

How does Indirect Calorimetry help estimate EE.?

A

RER = VC02/V02.

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9
Q

Each molecule of glucose oxidised liberates …… kcal heat energy? (fill the blank)

A

5.05

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10
Q

Each molecule of fat oxidised liberates …… kcal heat energy? (fill the blank)

A

4.69

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11
Q

A mixture of fuels oxidised liberates between …… kcal heat energy? (fill the blank)

A

4.69-5.05

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12
Q

If my RER is 1.00 and I have used 2 litres of O2 what is rate of energy produced (kcal/LO2)?

A

10.10 ?

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13
Q

If i am oxidising 100% fat my RQ/RER value will be…

A

0.7

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14
Q

RQ/RER values range from

A

0.7-1.00

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15
Q

If I am oxidising 100% CHO my RQ/RER value will be

A

1.00

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16
Q

If I am oxidising a mixture of fuel my RQ/RER value will be between…

A

0.7-1.00 depending on the proportion of fats and CHO oxidised.

17
Q

Define Basal metabolism (BMR)

A

Basal Metabolic Rate is the
minimum amount of energy
required to maintain essential
physiological functions

18
Q

What are the conditions to measure BMR?

A 
▪ Supine position
▪ Thermoneutral environment
▪ Immediately following 8 hours
sleep
▪ 12 hours fasted
19
Q

Define Resting metabolism (RMR)

A

Similar to BMR but without the
stringent standardised conditions associated with true BMR.

BMR values usually within 5 – 10% of
each other

20
Q

What are conditions for RMR?

A

Usually:
▪ Supine position
▪ Thermoneutral environment
▪ At least 8 hours fasted

21
Q

How do we estimate total daily energy expenditure ? TDEE.

A

TDEE = BMR X PAL

22
Q

Can you name some equations to predict BMR?

A

Henry’s equation and Black’s PALs

Research Techniques in Nutrition and Exercise (10 decks)

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