Summary
The effects of different physical training regimes on the plasma catecholamine values at rest and the density and responsiveness of adrenergic receptors at rest were investigated. The changes during well-defined training periods of swimmers, long-distance runners, weight lifters and wrestlers were compared with untrained male volunteers. The training of swimmers and long-distance runners, building up endurance, resulted in a significantly lower basal plasma norepinephrine (NE) concentration and a significantly or possibly lower ratio NE∶EPI (epinephrine). Both values indicated reduced sympathetic activity and resulted also in a significantly lower β-receptor density and a higher α 2-receptor sensitivity compared with the other groups investigated. However, swimming-specific characteristics provoked labile hypertensive blood pressure regulation with an unchanged heart rate in swimmers. Static training of weight lifters, building up power, also led to a lower NE concentration compared with untrained subjects, whereas β-receptor density was unchanged and α2-receptor density and sensitivity were decreased. Elevated blood pressure values were observed in weight lifters and swimmers due to a reduced baroreceptor sensitivity. The dynamic training of wrestlers affected only basal heart rate and α 2-receptor sensitivity, both of which were decreased. Different kinds of physical training caused various adaptations of the basal activity of the autonomic nervous system in which adrenergic receptors also became adapted. In this context, the stronger adrenergic circulatory component of overall sympathetic activity at rest in swimmers and long-distance runners resulted in lower β-receptor density, and the reduced noradrenergic component sensitized α2-receptors.
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Jost, J., Weiß, M. & Weicker, H. Comparison of sympatho-adrenergic regulation at rest and of the adrenoceptor system in swimmers, long-distance runners, weight lifters, wrestlers and untrained men. Europ. J. Appl. Physiol. 58, 596–604 (1989). https://doi.org/10.1007/BF00418505
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DOI: https://doi.org/10.1007/BF00418505