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Lecture 2 – Energy expenditure during exercise
How do we express VO2?
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Relative = ml/kg/min (convert to absolute = X body mass / 1000)
Absolute = L/min
(convert to relative = X 1000 / body mass)

Metabolic Equivalent (MET)
A MET is an individual’s resting metabolic rate or resting VO2
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5ml/kg/min
Number of METs = measured VO2 / resting VO2

Direct Calorimetry
40% of energy liberated from the metabolism of glucose and fats is used to produce
ATP
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Direct calorimetry involves an insulated airtight chamber that contains copper tubing in
which water is passed
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The water temperature change is recorded and then the metabolism can be
calculated from these values
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In order for oxygen consumption to reflect energy metabolism accurately, energy
production must be almost completely oxidative
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O2 consumption (L/min) can be calculated as  VO2 = (Vi X FiO2) – (Ve X FeO2) where:
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Vi = volume of air inspired
FiO2 = fraction of that inspired air that is oxygen
Ve = volume of air expired
FeO2 = fraction of that expired air that is oxygen

Basal and Metabolic Rate
Metabolic rate = the rate at which the body uses energy

Basal Meatabolic Rate (BMR) = the rate of energy expenditure for an individual at rest in
a supine position (laying down), measured immediately after 8 hours of sleep and 12
hours of fasting
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Fatigue
The inability to maintain the required power output to continue muscular work at a
given intensity which can be reversed by rest

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