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Effects of exercise on several adrenergic system parameters
Acta Physiologica Et Pharmacologica Latinoamericana : Organo De La Asociacion Latinoamericana De Ciencias Fisiologicas Y De La Asociacion Latinoamericana De Farmacologia
|January 1, 1984
Summary
Swimming exercise in rats impacts cardiac adrenergic sensitivity and neurotransmitter synthesis. Chronic exercise decreased cardiac sensitivity to noradrenaline, while acute exercise boosted tyrosine hydroxylation in adrenal glands.
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
- Exercise Science
Background:
- Exercise influences the autonomic nervous system.
- Cardiac adrenergic sensitivity and neurotransmitter synthesis are key regulatory mechanisms.
Purpose of the Study:
- To investigate the effects of acute and chronic swimming exercise on cardiac adrenergic sensitivity and noradrenaline synthesis in rats.
- To explore changes in tyrosine hydroxylase and monoamine oxidase activity.
Main Methods:
- Rats underwent acute (1 day) or chronic (3 or 7 days) swimming exercise.
- Assessed (-)-noradrenaline dose-response curves on isolated atria.
- Measured ventricular noradrenaline levels.
- Determined tyrosine hydroxylation and tyrosine hydroxylase activity in adrenal glands and atria.
- Assessed monoamine oxidase activity in the adrenal gland.
Main Results:
- Chronic swimming decreased cardiac adrenergic sensitivity to noradrenaline.
- Ventricular noradrenaline levels remained unchanged.
- Acute exercise augmented tyrosine hydroxylation in the adrenal gland.
- Chronic exercise increased tyrosine hydroxylase activity in adrenal glands and atria, but not tyrosine hydroxylation in intact atria.
- Acute exercise decreased monoamine oxidase activity in the adrenal gland.
Conclusions:
- Swimming exercise differentially affects cardiac adrenergic signaling and neurotransmitter metabolism.
- Chronic exercise may lead to adaptive changes in cardiac function and neurotransmitter synthesis pathways.