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Temporal relations of the endocrine response to exercise
Cardioscience
|June 1, 1991
Summary
This study tracked hormonal changes in males during and after moderate cycling exercise. Key hormones like norepinephrine, epinephrine, and renin peaked immediately post-exercise, while others like growth hormone and cortisol showed delayed increases.
Area of Science:
- Endocrinology
- Exercise Physiology
- Sports Medicine
Background:
- Understanding the acute hormonal responses to exercise is crucial for comprehending physiological adaptations.
- Previous research has identified various endocrine changes during physical activity, but a comprehensive profile of multiple hormones is often lacking.
Purpose of the Study:
- To investigate the dynamic changes in plasma hormone concentrations in healthy males during and after a standardized moderate-intensity cycling exercise bout.
- To characterize the temporal patterns of release and recovery for a wide range of hormones including catecholamines, peptides, and steroids.
Main Methods:
- Twelve healthy males performed a 10-minute cycling exercise at a constant moderate load.
- Blood samples were collected at multiple time points: before, during, and for 20 minutes after exercise.
- Plasma concentrations of numerous hormones (e.g., norepinephrine, epinephrine, renin, vasopressin, aldosterone, prolactin, ACTH, growth hormone, cortisol, neurotensin, ANP, glucagon, insulin, bombesin) were measured.
Main Results:
- Norepinephrine, epinephrine, renin, neurotensin, and atrial natriuretic peptide peaked at exercise cessation.
- Vasopressin peaked at exercise cessation, followed by a transient dip.
- Aldosterone, prolactin, and adrenocorticotropin increased during exercise, peaking 10 minutes post-exercise.
- Growth hormone and cortisol levels rose progressively during recovery.
- Insulin decreased during exercise, while glucagon remained unchanged.
- Bombesin showed a slow increase during exercise and a decline during recovery.
Conclusions:
- Moderate-intensity exercise elicits distinct temporal hormonal responses, with some hormones peaking acutely and others showing delayed or sustained increases during recovery.
- The observed hormonal shifts reflect the body's complex neuroendocrine adaptation to exercise stress.
- These findings contribute to a detailed understanding of exercise endocrinology and its impact on metabolic and cardiovascular regulation.