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Aerobic EnergyProduction During
ExercisePED 5230
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Moderate Aerobic
Energy
50-85% of VO2max
Oxygen?
Fuel?
Lactate?
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Moderate Aerobic
Energy
Oxygen Supply =OxygenDemand...barely
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Moderate Aerobic
Energy Shift towards a greater contribution from
carbohydrates.
Why?
Advantage?
Disadvantage?
2,000 versus 72,000
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Moderate Aerobic EnergyGrams Kcals
Liver glycogen 110 451
Muscleglycogen 500 2050
Glucose 15 62
Total 625 2563Subcutaneous
and VisceralFat
7,800 73,320
IntramuscularFat 161 1513
Total 7961 74,833 From Wilmore andCostill
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Moderate Aerobic
Energy
Goal: maintain glucose levels
Muscle
Central nervous system
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Moderate Aerobic
Energy Liver glycogen
Glucagon
Catecholamines
Epinephrine
Norepinephrine
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Moderate Aerobic
Energy 1.0 1.5
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Glycogen Depletion
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Moderate Aerobic
Energy Prolonged exerciseCarbohydrates
Hypoglycemia
Glycogen Depletion
Fats and ketones Proteins
Gluconeogenesis
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FatBurnsin aCarbohydrate/
ProteinFlame
low pyruvateKetones
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Moderate Aerobic
Energy Ketones
acetoacetate beta-
hydroxybutyrate
Fuel for ST fibers,brain and nerves
Acidic
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Moderate AerobicEnergy
Near lactate threshold
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Fatigue
QuickTime and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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Fatigue
ATP or P?
Glycogen depletion?
> 1-2 hours
Hypoglycemia?
Direct - muscle
Indirect - CNS
QuickTime and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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Hypoglycemia
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Hypoglycemia
MusclesGlycogen & Fat
Heart
AdiposeFat
LiverGlycogen
Brain
O2
(inhibit)
low glucose
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Fatigue
Lactic acid or H?
Low oxygen supply?
QuickTime and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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Oxygen / Lactic
Acid
MusclesGlycogen & Fat
Lungs Heart
AdiposeFat
LiverGlycogen
Brain
O2 O2
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Fatigue
Central fatigue?
Central drive or command
Central governor
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Central Fatigue
MusclesGlycogen & Fat
Lungs Heart
AdiposeFat
LiverGlycogen
Brain
O2 O2
(inhibit)
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Heavy Aerobic Energy
> 85% of VO2max
Oxygen?
Fuel?
Lactate?
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Heavy Aerobic Energy
Oxygen supply less than demand
Muscles
Heart, too?
Anaerobic energy
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Heavy Aerobic Energy
Fuel
Carbohydrate
Aerobic
Anaerobic
PC?
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Heavy Exercise
Fatigue
Lactic acid?
CNS?
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Heavy Aerobic Energy
Lactate
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Heavy Exercise
If a person were to begin exercising at theirVO2max, how long would they be able to last
at that intensity?
Why?
What is the recommended percentage of VO2max to exercise at?