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Short-term glucocorticoid intake and metabolic responses during long-lasting exercise
R Thomasson1, N Rieth, L Jollin
1Laboratoire AMAPP, EA 4248, Université d'Orléans, Orléans, France.
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|January 15, 2011
Summary
Short-term prednisone use significantly alters hormones and metabolism during prolonged exercise in women. Glucocorticoid treatment increases amino acids and blood glucose, potentially aiding energy supply.
Area of Science:
- Endocrinology
- Exercise Physiology
- Metabolic Research
Background:
- Glucocorticoids are potent hormones influencing metabolism and stress response.
- Understanding their effects during prolonged exercise is crucial for athletes and clinicians.
- Short-term glucocorticoid use impacts hormonal balance and substrate availability.
Purpose of the Study:
- To investigate the effects of short-term prednisone on metabolic and hormonal profiles during sustained physical exertion.
- To assess changes in plasma amino acids, free fatty acids, blood glucose, and key hormones.
- To evaluate these effects in healthy young female volunteers.
Main Methods:
- Double-blind, randomized, placebo-controlled study with 9 female participants.
- Participants underwent 2 hours of exercise at 50-55% VO₂ max.
- Blood samples analyzed at rest and during exercise for various analytes after placebo or prednisone treatment.
Main Results:
- Prednisone significantly decreased adrenocorticotrophic hormone (ACTH) and dehydroepiandrosterone (DHEA) levels.
- Growth hormone concentrations were lower with prednisone treatment during exercise.
- Plasma amino acids and blood glucose levels were elevated with prednisone, suggesting increased proteolysis and gluconeogenesis.
Conclusions:
- Short-term glucocorticoid intake significantly alters hormonal and metabolic responses during prolonged exercise.
- Elevated amino acids may serve as energy substrates, indicating potential increased proteolysis.
- Further research is needed to elucidate the precise mechanisms of glucocorticoid-induced proteolysis and gluconeogenesis during exercise.
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