21 Questions
What is the caloric equivalent for the number of kcal produced per L of VO2?
5 kcal/L O2
What is the formula for caloric cost (kcal/min)?
$VO2 (L/min) \times 5$
What does METs (metabolic equivalent) of 4 indicate?
Spend 4 times the energy compared to rest
What is the formula for relative VO2?
$VO2 / body mass$
What does mechanical efficiency (%) measure?
Percentage of energy that produces external work
What is the caloric cost when VO2 is 2.5 L/min?
10 kcal/min
If the resting energy expenditure is 1.5 kcal/kg/hr, what would be the METs for a person with a relative VO2 of 40 mL/kg/min?
11.4 METs
What is the energy expenditure when VO2 is 4 L/min for 20 minutes?
400 kcal
What is the caloric equivalent for the number of kcal produced per L of VO2 if the caloric cost is 10 kcal/min and VO2 is 2 L/min?
2.5 kcal/L O2
What is the formula for mechanical efficiency (%)?
Percentage of energy that produces external work (watts)/energy expended (VO2) x 100
If the relative VO2 is 50 mL/kg/min, what would be the METs?
14.3 METs
What is the formula to calculate efficiency percentage of energy expenditure that produces actual work?
Gross efficiency = (Total energy expended for a given work rate)/(Energy produced) x 100
What is the formula to calculate net efficiency?
Net efficiency = (Energy produced)/(Energy expended above rest) x 100
What affects efficiency and economy in physical activities?
Surface area-mass ratio, anaerobic capacity, and age
What is the formula to calculate Delta efficiency?
Delta efficiency = (Difference in energy expended between 2 work rates)/(Energy produced) x 100
What is the formula to calculate Gross efficiency?
Gross efficiency = (Total energy expended for a given work rate)/(Energy produced) x 100
What is the formula to calculate efficiency percentage?
Efficiency percentage = (Energy produced)/(Total energy expended for a given work rate) x 100
What is the relationship between economy and O2 cost in physical activities?
Inverse relationship (lower cost = more economical)
What can be used to estimate O2 cost in physical activities?
Graph of (m/min) x (mL/kg/kg) + 3.5 ml/kg/mL
What is the inverse of delta efficiency for cycling?
Gain (𝚫VO2/𝚫WR) = (Energy produced)/(Delta efficiency)
What affects running economy in children compared to adults?
Lower economy and higher BMR
Test your knowledge of energy expenditure with this quiz. Challenge yourself with questions on kilocalories, caloric equivalents, caloric cost, and the measurement of energy expenditure during physical activities.
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