Carbohydrates, Hormones and Endurance Performance

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Carbohydrates, Hormones and Endurance Performance

• GSSI 80
• Mark Davis, Ph.D.

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Key Point

• Prolonged strenuous exercise increases plasma
  concentrations of the hormones epinephrine,
  growth hormone, cortisol, and glucagon.
• Insulin is decreased.

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EXERCISE
Endocrine Glands
Endocrine Glands
Blood
Blood

• Increase in blood levels of
• Growth Hormone (GH)
• Glucagon
• Cortisol
• Epinephrine Norepinephrine

Adipose cells
Liver cells
Glycogen Glucose
Triglycerides Fatty Acids
Skeletal muscle

Glycogen Glucose
Fatty Acids
GLUT-4
Blood
Increase in fatty acid Increase in glucose.
Fatty acids Glucose
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Hormone Response Without Carbohydrate Consumption
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Key Point

• Ingestion of carbohydrate during prolonged
  exercise blunts these hormone responses and
  delays fatigue.

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Hormone Response With Carbohydrate Consumption
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Glucose Response With Without Carbohydrate
Consumption
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Power Output With Without Carbohydrate
Consumption
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Carbohydrate Consumption Summary
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Carbohdyrate Loading