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Endorphins and exercise in females: possible connection with reproductive dysfunction
Medicine and Science in Sports and Exercise
|February 1, 1985
Summary
Exercise increases beta-endorphin levels in women, potentially enhancing brain and circulation transfer. Hormone levels in athletes show varied results, possibly due to sampling methods and exercise-induced stress.
Area of Science:
- Exercise physiology
- Neuroendocrinology
- Sports medicine
Background:
- Exercise significantly impacts hormonal responses, including endorphins.
- Previous studies show increased beta-endorphin with exercise.
- Hormonal changes in athletes, particularly reproductive hormones, are complex.
Purpose of the Study:
- To examine exercise effects on endorphin transfer between circulation and the brain.
- To investigate luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels in athletes.
- To reconcile conflicting data on reproductive hormones in exercising women.
Main Methods:
- Measurement of beta-endorphin and beta-lipotropin in exercising women.
- Analysis of peripheral and central nervous system endorphin levels.
- Assessment of steady-state LH and FSH levels in oligo-amenorrheic athletes.
Main Results:
- Consistent 2-3 fold increase in beta-endorphin and beta-lipotropin with exercise.
- Evidence suggests increased endorphins in both circulation and brain compartments post-exercise.
- Inconsistent LH and FSH measurements in athletes, attributed to technical issues and sampling frequency.
Conclusions:
- Exercise promotes endorphin release and transfer to the brain.
- Low LH and normal/low FSH levels in athletes may indicate chronic stress on the HPG axis.
- CRH-ACTH-POMC system activation is a likely factor in exercise-related hormonal changes.