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Energy Expenditure Quiz

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Questions and Answers

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?

$VO2 / body mass$ (B) Signup and view all the answers

What does mechanical efficiency (%) measure?

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

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

10 kcal/min (B) 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 (A) Signup and view all the answers

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

400 kcal (D) 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 (C) 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 (A) Signup and view all the answers

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

14.3 METs (D) 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 (B) Signup and view all the answers

What is the formula to calculate net efficiency?

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

What affects efficiency and economy in physical activities?

Surface area-mass ratio, anaerobic capacity, and age (D) 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 (A) 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 (D) 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 (D) Signup and view all the answers

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

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

What is the inverse of delta efficiency for cycling?

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

What affects running economy in children compared to adults?

Lower economy and higher BMR (B) Signup and view all the answers

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