Energy Expenditure Flashcards
What is VO2?
VO2 = Ventilation (FIO2 - FeO2)
FIO2 is the fraction of inspired oxygen and FeO2 is the fraction of expired oxygen.
What does FIO2 represent?
FIO2 = inhaled O2
FIO2 is typically about 20.93% in the environment.
What is the formula for VO2 relative to body mass?
VO2 Relative to Body Mass = VO2 / Weight
What is maximal oxygen uptake (VO2 Max)?
The greatest rate of oxygen consumption.
How do men generally compare to women in terms of VO2 Max?
Men have higher VO2 Max due to more blood that has a carrying capacity.
How much energy does 1 L of O2 provide?
1 L of O2 = 5 kcal
What is the formula for estimating energy expenditure (EE)?
EE = VO2 x 5 kcal x time
What is doubly labeled water?
Water with different isotopes.
Define isotopes.
Atoms with extra neutrons.
What are the three types of hydrogen isotopes?
- Protium: 1 electron & 1 proton
- Deuterium: 1 electron & 1 proton & 1 neutron
- Tritium: 1 electron & 1 proton & 2 neutrons
What are the two isotopes of oxygen mentioned?
- Oxygen 16: 8 electrons, 8 protons, 8 neutrons
- Oxygen 18: 8 electrons, 8 protons, 10 neutrons
What is the formula for VCO2?
VCO2 = 18O elimination (water + CO2) - 2H2 elimination (water)
What is the ratio of VCO2 to VO2 in a free environment?
0.85
What does RER stand for?
Respiratory Exchange Ratio
How is RER calculated?
RER = VCO2 / VO2
What is the relationship between VO2 and VCO2?
VO2 = VCO2 / 0.85
What is the formula for calculating energy expenditure in kcal?
Energy Expenditure (kcal) = VO2 (L/min) x 5
What does MET stand for?
Metabolic Equivalent
What is the value of 1 MET?
1 MET = 3.5 ml x kg x min
What is the Total Daily Energy Expenditure (TEE) formula?
TEE = REE + TEF + AEE
What does DLW stand for?
Doubly Labeled Water
What is indirect calorimetry used for?
To measure resting energy expenditure.
What is the largest kcal consumer in energy expenditure?
Resting Energy Expenditure (REE)
What are the components of Activity Energy Expenditure (AEE)?
- Exercise Energy Expenditure (ExEE)
- Non-Exercise Activity Thermogenesis (NEAT)
Describe the relationship between work and VO2.
Work and VO2 have a linear relationship.
What is the formula for estimating VO2 during running?
VO2 = (0.2 x mxmin) + 3.5
What is the formula for estimating VO2 during walking?
VO2 = (0.1 x mxmin) + 3.5
What is the formula for efficiency in terms of work and VO2?
Efficiency = Delta work / Delta VO2
How many kcal does 1 W represent?
1 W = 0.0143 kcal/min
