Measurements of energy expenditure Flashcards
What is indirect calorimetry?
measures the production of carbon dioxide and or the consumption of oxygen using a mask and metabolic cart
What is lactate sampling?
involves measuring the level of lactate in the blood stream
What is RER?
the Respiratory Exchange Ratio:
ratio of carbon dioxide produced compared to oxygen consumed
What is direct gas analysis?
measures concentration of oxygen that is inspired and the concentration of carbon dioxide that is expired
What values of RER will determine which energy source is being oxidised?
close to 1 = carbohydrates being used
approx. 0.7 = fats being used
grater than 1 = anaerobic respiration so more CO2 produced than O2 consumed
How many calories are in 1litre of oxygen?
5calories
What is BMR?
Basal Metabolic Rate:
minimum amount of energy required to sustain physiological functions
71 calories per hour
What is thermic effect of food?
energy required to eat, digest and absorb food
What is energy expenditure?
BMR + Thermic Effect of Food
What is the VO2 Max test?
carried out on treadmill, cycle ergometer, rowing machine to calculate max amount of oxygen consumed per minute
direct gas analysis
What VO2 Max test tests until exhaustion?
ramp test
