CALORIMETRY Flashcards
1
Q
what is indirect calorimetry?
A
estimate energy expenditure through O2 consumption
2
Q
what is indirect calorimetry: closed-circuit spirometry
A
subject breaths 100% O2 from spirometer, canister of soda lime absorbs CO2, revolving drum records O2 removed
3
Q
what is indirect calorimetry: open-circuit spirometry
A
subject inhales ambient air (20.93% O2, 0.03% CO2, 79.04% N)
analyzes the volume and composition of expired air
4
Q
3 common methods:
A
- portable spirometry
- bag technique
- computerized instrumentation
5
Q
what is respiratory quotient?
A
approximate the
nutrient mixture catabolized for energy during rest and aerobic
exercise
6
Q
what are the RQ values for CHO, fat, protein, nonprotein, and mixed diet
A
CHO= 1.00 fat = 0.696 protein = 0.818 nonprotein = 0.86 mixed diet = 0.82
7
Q
what is RER?
A
respiratory exchange ratio
8
Q
what is indicated by an RER greater than 1?
A
excess CO2 production in relation to O2 uptake
