07 ENERGY METABOLISM AND BODY TEMPERATURE.pdf

ChapterChapter 77
EnergyEnergy MetabolismMetabolism
&& BodyBody TemperatureTemperature
PartPart 11 EnergyEnergy MetabolismMetabolism
¢ Source and utilization of energy
in the body
¢ Measurement of the energy metabolism
¢ Factors affecting the energy
metabolism
¢ Basal metabolism
DefinitionDefinition ofof energyenergy metabolismmetabolism ::
EnergyEnergy metabolismmetabolism is used to refer
to all processes of liberation, storage,
transformation and utilization of energy
produced by the material metabolism in
the body.
AthleticAthletic physiology:physiology:
Nutrition:Nutrition: DietaryDietary balancesbalances
. SourceSource andand utilizationutilization ofof energyenergy
EnergyEnergy intake:intake:
Foods (carbohydrate, fat and protein)
OO2 HeatHeat ((˚˚˚˚˚˚50%)50%) Muscle contraction
ATP
n
n
o
o Nerve conduction
i
i
t
t Energy C- P
a Energy
a
d
d
i
i Anabolism
x ˘˘˘
x (˘˘˘50 %)
o
o ADP
Pi Etc.
CO 2, H 2O, urea
‹‹ EnergyEnergy output:output:
•• HeatHeat
•• ExternalExternal workwork
•• ChemicalChemical energyenergy HeatHeat
ĊĊĊĊĊĊ.. MeasureMeasure ofof energyenergy metabolismmetabolism
°° EnergyEnergy metabolismmetabolism rate:rate:
TheThe amountamount ofof energyenergy liberatedliberated perper uniteunite .
°° PrinciplePrinciple 1:1:
thethe lawlaw ofof conservationconservation ofof energyenergy
EnergyEnergy intakeintake == EnergyEnergy outputoutput
TheThe amount amount of of energy energy liberated liberated
== The The amount amount of of heat heat + external work
‹‹ MethodMethod 11 ———— DirectDirect calorimetrycalorimetry
‹‹ MethodMethod 22 ———— IndirectIndirect calorimetrycalorimetry
°° PrinciplePrinciple 2:2:
thethe lawlaw ofof definitedefinite proportionsproportions
∆∆∆
C6H12 O6 + 6O 2 6CO 2 + 6H 2O + H
water
Respiration Heat
H2SO 4 H2SO 4
Pump
°° ThermalThermal equivalentequivalent ofof food:food:
TheThe amountamount ofof energyenerg