Exam 2 Ch 10 Flashcards
Estimates total body energy expenditure based on O2 used and CO2 produced
Calorimetry
Volume of O2 consumed per minute
VO2
Equation for VO2
volume of inspired O2 - volume of expired O2
Volume of CO2 produced per minute
VCO2
equation for VCO2
volume of expired CO2 - volume of inspired CO2
Allows V of inspired air (unknown) to be directly calculated from V of expired air (known)
Based on constancy of N2 volumes
haldane transformation
Ratio between rates of CO2 production and O2 usage
Respiratory exchange ratio (RER)
equation for respiratory exchange ration (RER
RER = VCO2 production / VO2 consumption
RER for 1 molecule of glucose
1.0
RER for 1 molecule of palmitic acid
0.70
Explain RER for various fuel mixtures
As you use more fat there is less carbohydrates being used and viceversa
rate of energy use by the body
metabolic rate
What is RER at rest
0.8 and VO2 is about 0.3 L/min
What is metabolic rate at rest
2000 kcal/day
Basal metabolic rate
rat of energy expenditure at rest (what you burn just being alive at a minimal level)
In supine position
Thermoneutral environment
After 8 h sleep and 12 h fasting
Factors that effect BMR
Fat-free mass
body surface area
age
temperature (C)
stress
higher levels of T4 and epinephrin
Resting metabolic rate
Takes into account that you do move around
about 1200 to 2400 kcal/day
normal range for total daily metabolic activity
1800 to 3000 kcal/day
Competitive athletes total daily metabolic activity
up to 10,000 kcal/day
VO2 max
point at which O2 consumption doesn’t increase with further increase in intensity
Best single measurement of aerobic fitness
When does VO2 max plateau
after 8-12 weeks of training
More training allows athlete to compete at higher percentage of VO2 max
Absolute VO2 vs relative VO2
absolute - suitable for non-weight bearing activities
Relative - more accurate comparison for different body sizes because you use body weight
