Journal of Applied Physiology
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J Appl Physiol 87: 317-324, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 1, 317-324, July 1999

Increased training load and the beta -adrenergic-receptor system on human lymphocytes

K. Schaller, D. Mechau, H. Grosse Scharmann, M. Weiss, M. Baum, and H. Liesen

Institute of Sports Medicine, University of Paderborn, 33098 Paderborn, Germany

The influence of increased training on the sympathoadrenergic system was investigated. Moderately trained male subjects (n = 15) increased their training within 10 wk by 60%; eight of the subjects increased their training volume, and seven increased their training intensity. Before and after the training, an exhaustive treadmill exercise was carried out. Acute treadmill exercise increased beta -adrenergic receptor number on mononuclear lymphocytes, isoproternol-stimulated cAMP production, and plasma catecholamine concentration. The increase of receptor number can at least partially be explained by a changed lymphocyte composition at rest and after exercise. After training, the exercise-induced increase of beta -adrenergic receptor number was significantly blunted, and the exercise-induced increase of the isoproternol-stimulated cAMP production per beta -receptor was enhanced. Subjects who experienced increased symptoms of physical discomfort and/or mood changes showed an enhanced cAMP production after training. These findings point to an altered regulation of the receptor and postreceptor mechanisms as an effect of a 10-wk period of hard training.

catecholamines; adenosine 3',5'-cyclic monophosphate; lymphocyte subsets; exercise; overtraining


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