energy metabolism Flashcards
BMI equation
BMI = weight (kg)/height^2 (m^2)
what type of obesity has most increased health risks?
intra-abdominal
definition of kcal
heat required to raise 1 kg water by 1*C
why is all of the energy from protein not available for ATP synthesis?
some of the energy from protein needs to be used for urea synthesis (so it can be excreted)
4 components of energy expenditure
basal metabolic rate- 60%
purposeful activity- 25%
Thermic effect of food- 8%
non-exercise activity- 7%
main storage of energy
as TAG in adipocytes
what is measured in indirect calorimetry?
oxygen consumption vs. carbon dioxide production
respiratory quotient equation
CO2 released/O2 consumed
RQ of CHO only
1.0
RQ of fat only
0.71
why is protein usually omitted from RQ studies?
harder to measure, need 24 urea excretion
equation to determine the quantity of each food consumed
RQ + O2 consumed
difference between REE and BMR
REE usually greater by about 10%, bc BMR is measured at fasting and REE is not
REE for males, females
males- 1 kcal/kg/hr
females- 0.9 kcal/kg/hr
why is REE different in men vs women?
men are thought to have more lean mm mass
