Flashcards in energy metabolism Deck (24):
BMI = weight (kg)/height^2 (m^2)
what type of obesity has most increased health risks?
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
RQ of fat only
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
effect of age on REE
REE decreases about 2% per decade
effect of pregnancy and lactation on REE
effect of weight training on REE
increases REE with increased lean mm mass
effect of starvation on REE
effect of hyper catabolic state on REE
how is REE estimated for overweight pts?
based on ideal weight
multiples of REE, used to quantify activity
equation for energy requirement
REE x activity factor