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Types of Hormones
• Steroid Hormones:
– Structure similar to cholesterol
– Can pass through cell membranes
– Direct gene activation
• Non-steroid Hormones:
– Protein/peptide or amino acid-derived
– Cannot pass through cell membrane
– Second messenger activation
Steroid Hormones
Steroid Hormones
• Proteins formed from mRNA may be:
– Enzymes
– Structural Proteins
– Regulatory Proteins
• Includes:
– Cortisol
– Aldosterone
– Estrogen/Progesterone/Testosterone
Non-steroid Hormones
Non-steroid Hormones
• Second Messengers (cAMP) can:
– Activate cellular enzymes
– Change membrane permeability
– Promote protein synthesis
– Change cellular metabolism
– Stimulate cellular secretions
• Includes:
– Thyroid Hormones
– Epinephrine/Norepinephrine
Overview
• Hormones that mediate specific actions
during exercise:
–Regulation of Glucose Metabolism
–Regulation of Fat Metabolism
–Regulation of Blood Plasma
Regulation of Glucose Metabolism
• Controlled by Five Hormones:
– Insulin (Rest Only)
– Glucagon
– Epinephrine
– Norepinephrine
– Cortisol
• During Exercise Blood Glucose is affected by three
factors:
– Liver release of glucose
– Muscle uptake of glucose
– Dietary intake of glucose
Glucagon
• Secretion Site: Pancreas ( cells)
• Action: Cause liver glycogen breakdown and
glucose release to blood
• Exercise Response: Positively correlated to
exercise intensity
• Effect of Chronic Exercise:  at given intensity
compared to untrained individual
Epinephrine and Norepinephrine
• Secretion Site: Adrenal Medulla and SNS
• Action: Works with Glucagon
• Exercise Response: Positively correlated to exercise
intensity (intensity >50-75% of max effort)
• Effect of Chronic Exercise:  at given intensity
compared to untrained individual
Cortisol
• Secretion Site: Adrenal Cortex
• Action: Increase in Protein Catabolism, Increase
blood amino acids for gluconeogenesis (making
glucose from other substrates)
• Exercise Response: Positively correlated to
exercise intensity (>80% max effort)
• Effect of Chronic Exercise: Slight  at given
intensity compared to untrained individual
Short Duration Exercise
High intensity = Greater catecholamine release
= Greater release of glucose from liver
40-50% increase in blood glucose
Replenishes muscle glycogen stores
Long Duration Exercise
• Glucose production = demand
• Liver glycogen stores are a limiting factor
• Blood glucose concentration may decrease
• Glucagon/Cortisol  gluconeogenesis
• CHO intake beneficial
Blood Glucose Exercise Response
Exercise Duration (min)
Glucagon
Cortisol
15 60 90
E + NE
Response
Blood
Glucose
Insulin
• Secretion Site: Pancreas ( cells)
• Action: Glucose uptake by muscle at rest,
regulating blood glucose concentration
• Exercise Response: Not released during exercise;
receptors more sensitive, thus less insulin
required
• Effect of Chronic Exercise: No exercise response
Insulin, Blood Glucose, & Exercise
Exercise Duration (min)
30 60 90
Response
Blood Glucose
Insulin
Regulation of Fat Metabolism
• Controlled by Five Hormones:
– (Insulin)
– Cortisol
– Epinephrine
– Norepinephrine
– Growth Hormone
• Fat Metabolism is needed
– When exercise depletes glycogen stores (long duration
exercise)
– When diet depletes glycogen stores (fasting, low CHO
dieting, etc.)
Cortisol
• Secretion Site: Adrenal Cortex
• Action: Increase Liver Gluconeogenesis,  blood
Free Fatty Acids
• Exercise Response: Positively correlated to
exercise intensity, but only acts during first 30-45
minutes
• Effect of Chronic Exercise: Slight  at given
intensity compared to untrained individual
Epinephrine and Norepinephrine
• Secretion Site: Adrenal Medulla and SNS
• Action: Activates hormone sensitive lipase, works with
glucagon
• Exercise Response: Positively correlated to exercise
intensity (intensity >50-75% of max effort)
• Effect of Chronic Exercise:  at given intensity
compared to untrained individual
Growth Hormone
• Secretion Site: Anterior Pituitary Gland
• Action: Maintains cortisol induced activation of
hormone sensitive lipase
• Exercise Response: Positively correlated to
exercise intensity
• Effect of Chronic Exercise:  at given intensity
compared to untrained individual
Fat Metabolism during Exercise
Exercise Duration (min)
30 60 90
Response
Blood FFA
Cortisol
Growth Hormone
E + NE
Glycogen
Regulation of Blood Plasma
• Controlled by Five Hormones:
– Aldosterone
– Renin
– Angiotensin I
– Angiotensin II
– Antidiuretic Hormone (ADH)
• Maintenance of Blood and Blood Plasma
– Maintain blood supply to active tissue
– Provide fluid for the production of sweat
– Increased oxygen carrying capacity
Aldosterone
• Secretion Site: Adrenal Cortex
• Action: Increased Na+ and water reabsorption in
the kidneys
• Exercise Response: Positively correlated to
change in plasma volume
• Effect of Chronic Exercise: No effect
Signal for Aldosterone Release
1. Kidneys sense drop in blood pressure
(due to decrease in plasma volume)
1. Kidneys release Renin
2. Renin is transformed to Angiotensin I, which is
transformed into Angiotensin II
3. Angiotensin II stimulates Aldosterone release
from the Adrenal Cortex
Renin-Angiotensin-Aldosterone
ADH
• Secretion Site: Posterior Pituitary Gland
• Action: Increases water reabsorption in the kidneys
• Exercise Response: Positively correlated to increase
blood concentration (hemoconcentration)
• Effect of Chronic Exercise:  at given intensity
compared to untrained individual
ADH
Maintenance of Blood Plasma
Exercise Duration (min)
30 60 90
Response
Plasma Volume
Aldosterone
-15%
ADH

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Lecture 3 exercise endocrinology

  • 1.
  • 2. Types of Hormones • Steroid Hormones: – Structure similar to cholesterol – Can pass through cell membranes – Direct gene activation • Non-steroid Hormones: – Protein/peptide or amino acid-derived – Cannot pass through cell membrane – Second messenger activation
  • 4. Steroid Hormones • Proteins formed from mRNA may be: – Enzymes – Structural Proteins – Regulatory Proteins • Includes: – Cortisol – Aldosterone – Estrogen/Progesterone/Testosterone
  • 6. Non-steroid Hormones • Second Messengers (cAMP) can: – Activate cellular enzymes – Change membrane permeability – Promote protein synthesis – Change cellular metabolism – Stimulate cellular secretions • Includes: – Thyroid Hormones – Epinephrine/Norepinephrine
  • 7. Overview • Hormones that mediate specific actions during exercise: –Regulation of Glucose Metabolism –Regulation of Fat Metabolism –Regulation of Blood Plasma
  • 8. Regulation of Glucose Metabolism • Controlled by Five Hormones: – Insulin (Rest Only) – Glucagon – Epinephrine – Norepinephrine – Cortisol • During Exercise Blood Glucose is affected by three factors: – Liver release of glucose – Muscle uptake of glucose – Dietary intake of glucose
  • 9. Glucagon • Secretion Site: Pancreas ( cells) • Action: Cause liver glycogen breakdown and glucose release to blood • Exercise Response: Positively correlated to exercise intensity • Effect of Chronic Exercise:  at given intensity compared to untrained individual
  • 10. Epinephrine and Norepinephrine • Secretion Site: Adrenal Medulla and SNS • Action: Works with Glucagon • Exercise Response: Positively correlated to exercise intensity (intensity >50-75% of max effort) • Effect of Chronic Exercise:  at given intensity compared to untrained individual
  • 11. Cortisol • Secretion Site: Adrenal Cortex • Action: Increase in Protein Catabolism, Increase blood amino acids for gluconeogenesis (making glucose from other substrates) • Exercise Response: Positively correlated to exercise intensity (>80% max effort) • Effect of Chronic Exercise: Slight  at given intensity compared to untrained individual
  • 12. Short Duration Exercise High intensity = Greater catecholamine release = Greater release of glucose from liver 40-50% increase in blood glucose Replenishes muscle glycogen stores
  • 13. Long Duration Exercise • Glucose production = demand • Liver glycogen stores are a limiting factor • Blood glucose concentration may decrease • Glucagon/Cortisol  gluconeogenesis • CHO intake beneficial
  • 14. Blood Glucose Exercise Response Exercise Duration (min) Glucagon Cortisol 15 60 90 E + NE Response Blood Glucose
  • 15. Insulin • Secretion Site: Pancreas ( cells) • Action: Glucose uptake by muscle at rest, regulating blood glucose concentration • Exercise Response: Not released during exercise; receptors more sensitive, thus less insulin required • Effect of Chronic Exercise: No exercise response
  • 16. Insulin, Blood Glucose, & Exercise Exercise Duration (min) 30 60 90 Response Blood Glucose Insulin
  • 17. Regulation of Fat Metabolism • Controlled by Five Hormones: – (Insulin) – Cortisol – Epinephrine – Norepinephrine – Growth Hormone • Fat Metabolism is needed – When exercise depletes glycogen stores (long duration exercise) – When diet depletes glycogen stores (fasting, low CHO dieting, etc.)
  • 18. Cortisol • Secretion Site: Adrenal Cortex • Action: Increase Liver Gluconeogenesis,  blood Free Fatty Acids • Exercise Response: Positively correlated to exercise intensity, but only acts during first 30-45 minutes • Effect of Chronic Exercise: Slight  at given intensity compared to untrained individual
  • 19. Epinephrine and Norepinephrine • Secretion Site: Adrenal Medulla and SNS • Action: Activates hormone sensitive lipase, works with glucagon • Exercise Response: Positively correlated to exercise intensity (intensity >50-75% of max effort) • Effect of Chronic Exercise:  at given intensity compared to untrained individual
  • 20. Growth Hormone • Secretion Site: Anterior Pituitary Gland • Action: Maintains cortisol induced activation of hormone sensitive lipase • Exercise Response: Positively correlated to exercise intensity • Effect of Chronic Exercise:  at given intensity compared to untrained individual
  • 21. Fat Metabolism during Exercise Exercise Duration (min) 30 60 90 Response Blood FFA Cortisol Growth Hormone E + NE Glycogen
  • 22. Regulation of Blood Plasma • Controlled by Five Hormones: – Aldosterone – Renin – Angiotensin I – Angiotensin II – Antidiuretic Hormone (ADH) • Maintenance of Blood and Blood Plasma – Maintain blood supply to active tissue – Provide fluid for the production of sweat – Increased oxygen carrying capacity
  • 23. Aldosterone • Secretion Site: Adrenal Cortex • Action: Increased Na+ and water reabsorption in the kidneys • Exercise Response: Positively correlated to change in plasma volume • Effect of Chronic Exercise: No effect
  • 24. Signal for Aldosterone Release 1. Kidneys sense drop in blood pressure (due to decrease in plasma volume) 1. Kidneys release Renin 2. Renin is transformed to Angiotensin I, which is transformed into Angiotensin II 3. Angiotensin II stimulates Aldosterone release from the Adrenal Cortex
  • 26. ADH • Secretion Site: Posterior Pituitary Gland • Action: Increases water reabsorption in the kidneys • Exercise Response: Positively correlated to increase blood concentration (hemoconcentration) • Effect of Chronic Exercise:  at given intensity compared to untrained individual
  • 27. ADH
  • 28. Maintenance of Blood Plasma Exercise Duration (min) 30 60 90 Response Plasma Volume Aldosterone -15% ADH

Editor's Notes

  1. Increased the plasma osmolality (the ionic concentration of dissolved substances in the plasma)