Metabolism (1.1)

Question 1

Measuring body composition

Answer 1

skin folds
bioelectrical impedence
air displacement (“bod pod”)
DEXA

Question 2

Measuring energy expenditure

Answer 2

device
Questionnaire
Indirect calorimetry
Double labeled H2O

Question 3

Components of energy expenditure

Answer 3

Basal metabolic rate
thermic effect of food (chemical work of breaking bonds, etc): obligatory vs facultative
Mechanical work
Physical activity energy expenditure (waste/inefficiency)

Question 4

Resting energy expenditure comprises what fraction of total energy expenditure in a sedentary person?

Answer 4

75% (60% in active person)

Question 5

Hierarchy of fuels and converting grams to calories

Answer 5

Alcohol: 7 kcal/g, no storage pool
Protein: 4 kcal/g, no true storage pool
Glucose: 4 kcal/g, storage as glycogen in liver and muscle. Muscle glycogen cannot be released as glucose
Fat: 9 kcal/g, large storage pool (triglyceride in adipose tissue is body’s major fuel reserve)

Question 6

Glucokinase and hexokinase

Answer 6

Glucose to G6P (liver)

hexokinase: everywhere else