Energy Balance. stopped at slide 13

Question 1

What makes up the bodies energy consumption?

Answer 1

Basal metabolism (60-75%)
Thermogenesis (10%)
Physical activity (15-30%)

Question 2

What does 1 kcal equate to?

Answer 2

4.2 KJ

Amount of heat required to raise the temperature of 1L of water by 1oC

Question 3

What is the average food digestibility in healthy adults?

Answer 3

93%

Question 4

Metabolisable energy =

Answer 4

Gross energy (ingested energy) - energy in faeces and urine as urea

Question 5

How much of protein energy is lost as urea?

Answer 5

1/4

Question 6

What does a high energy density mean?

Answer 6

Lots of energy in a small amount of food

Question 7

Energy density =

Answer 7

CHO (kJ) + protein (kJ) + fat (kJ) + alcohol (kJ) / CHO (g) + protein (g) + fat (g) + alcohol (g) + water (g) + undigestible parts (g)

Question 8

Whats another term for BMR?

Answer 8

Obligatory energy expenditure

Question 9

BMR

Answer 9

The rate at which the body expends energy to sustain basic life processes like blood circulation

Question 10

Direct calorimetry

Answer 10

Measures dissipation of heat from the body

Requires a special room to be built

Question 11

Indirect calorimetry

Answer 11

Measures O2 consumed and CO2 produced and works out energy expenditure from that ratio
Not tissue specific

Question 12

Respiratory quotient

Answer 12

Energy produced worked out from ratio of CO2 expired to O2 inhaled

Question 13

Isotopic tracer calorimetry

Answer 13

Subject drinks doubly labelled water

Saliva and urine samples collected after a few days

Question 14

In what state do you need to be to have BMR tested?

Answer 14

Fasted state

Question 15

In what state do you need to be to have resting metabolic rate tested?

Answer 15

At rest

Question 16

How much lower is sleeping metabolic rate lower than BMR?

Answer 16

5-10%