Energy Expenditure Quiz

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What is the caloric equivalent for the number of kcal produced per L of VO2?

4.5 kcal/L O2

6 kcal/L O2

3.5 kcal/L O2

5 kcal/L O2 (correct)

What is the formula for caloric cost (kcal/min)?

$VO2 (L/min) \div 3.5$

$VO2 (L/min) \times 5$ (correct)

$VO2 (L/min) \div 5$

$VO2 (L/min) \times 3.5$

What does METs (metabolic equivalent) of 4 indicate?

Spend 4 times the energy compared to rest (correct)

Spend half the energy compared to rest

Spend 10 times the energy compared to rest

Spend 2 times the energy compared to rest

What is the formula for relative VO2?

$VO2 / body mass$ Signup and view all the answers

What does mechanical efficiency (%) measure?

Percentage of energy that produces external work Signup and view all the answers

What is the caloric cost when VO2 is 2.5 L/min?

10 kcal/min Signup and view all the answers

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 Signup and view all the answers

What is the energy expenditure when VO2 is 4 L/min for 20 minutes?

400 kcal Signup and view all the answers

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 Signup and view all the answers

What is the formula for mechanical efficiency (%)?

Percentage of energy that produces external work (watts)/energy expended (VO2) x 100 Signup and view all the answers

If the relative VO2 is 50 mL/kg/min, what would be the METs?

14.3 METs Signup and view all the answers

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 Signup and view all the answers

What is the formula to calculate net efficiency?

Net efficiency = (Energy produced)/(Energy expended above rest) x 100 Signup and view all the answers

What affects efficiency and economy in physical activities?

Surface area-mass ratio, anaerobic capacity, and age Signup and view all the answers

What is the formula to calculate Delta efficiency?

Delta efficiency = (Difference in energy expended between 2 work rates)/(Energy produced) x 100 Signup and view all the answers

What is the formula to calculate Gross efficiency?

Gross efficiency = (Total energy expended for a given work rate)/(Energy produced) x 100 Signup and view all the answers

What is the formula to calculate efficiency percentage?

Efficiency percentage = (Energy produced)/(Total energy expended for a given work rate) x 100 Signup and view all the answers

What is the relationship between economy and O2 cost in physical activities?

Inverse relationship (lower cost = more economical) Signup and view all the answers

What can be used to estimate O2 cost in physical activities?

Graph of (m/min) x (mL/kg/kg) + 3.5 ml/kg/mL Signup and view all the answers

What is the inverse of delta efficiency for cycling?

Gain (𝚫VO2/𝚫WR) = (Energy produced)/(Delta efficiency) Signup and view all the answers

What affects running economy in children compared to adults?

Lower economy and higher BMR Signup and view all the answers