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  • 1
    ISSN: 1432-1440
    Keywords: Beta-adrenergic blockade ; Physical excercise ; Metabolism ; Hormones ; Beta-Blockade ; Körperarbeit ; Metabolismus ; Hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 14 gesunden Probanden wurde der Einfluß einer Beta1-selektiven Blockade (100 mg Metoprolol) bei 50minütiger Körperarbeit auf dem Laufband mit einer Belastungsintensität von 65% der maximalen Leistungsfähigkeit auf den Metabolismus untersucht. Sowohl unter Beta-Blockade als auch im Kontrollversuch wurden Glukose und Lactat im arterialisierten Kapillarblut, freie Fettsäuren und Glycerin im Serum, Adrenalin und Noradrenalin im Plasma sowie STH, Cortisol, Glucagon, Insulin, Testosteron und Östradiol im Serum bestimmt. Während Lactat und Glukose keine signifikanten Unterschiede zeigten, waren freie Fettsäuren und Glycerin unter Beta-Blockade um 50 bzw. 30% erniedrigt. Adrenalin und Noradrenalin lagen unter Beta-Blokkade im Vergleich zum Kontrollversuch um 104 bzw. 54%, STH und Cortisol um 60 bzw. 72% sowie Glucagon um 36% höher. Während die Konzentrationen für Insulin und Östradiol keine Unterschiede zeigten, lag Testosteron unter Beta-Blockade um 21% niedriger. Die Befunde zeigen, daß die bei längerdauernder Körperarbeit unter akuter Beta1-selektiver Blockade gehemmte Lipolyse zu einem Anstieg für den Metabolismus wesentlicher Hormone führt. Dadurch kann ein energetisches Defizit verhindert werden, so daß bei ausdauercrientierten Belastungen unter Beta1-selektiver Blockade aus metabolischer Sicht eine wesentliche Beeinträchtigung der körperlichen Leistungsfähigkeit nicht zu erwarten ist.
    Notes: Summary The effects of beta-1-adrenergic blockade (100 mg metoprolol) on metabolism in exercise was examined in 14 healthy males who worked for 50 min on a treadmill at 65% of their maximal exercise capacity. The tests were carried out in a double blind fashion. Glucose and lactate were determined in arterialized capillary blood, free fatty acids, glycerol, growth hormone, cortisol, glucagon, insulin, testosterone, and estradiol in serum, and adrenaline and noradrenaline in plasma. Lactate and glucose were not significantly affected by beta-1-adrenergic blockade, free fatty acids and glycerol were reduced by 50% and 30% respectively as compared with the unmedicated condition. Adrenaline and noradrenaline levels were increased by 104% and 54% respectively, growth hormone by 60%, cortisol by 72%, and glucagon by 36% when compared with the control experiments. Insulin and estradiol were unaffected, testosterone was depressed by 21% under medication. The results demonstrate that during prolonged exercise beta-1-adrenergic blockade depresses lipolysis. Energetic deficiency is prevented by counter-regulatory increases of various hormones. Consequently, from the metabolic point of view there is no indication of impairment of prolonged exercise capacity under beta-1-adrenergic blockade.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1439-6327
    Keywords: Supramaximal exercise ; Hormones ; Substrates ; Β-adrenergic blockade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The metabolic and hormonal responses to exhaustive short-term supramaximal exercise were studied in 10 male physical education students. The exercise task was a single bout of running on the treadmill at 22 km·h−1 and 7.5% slope. It was performed with single oral doses of 100 mg Bupranolol (non-selective Β-blockade), 100 mg Metoprolol (Β-1-selective blockade), and placebo. Arterialized capillary and venous blood were sampled until 30 min post exercise. Time to exhaustion was 52.0±2.6, 47.6±2.0, and 46.0±1.9 s in the control, Metroprolol, and Bupranolol experiments. At cessation of exercise, adrenaline and noradrenaline were grossly elevated in all three conditions. Lactate and glucose increased markedly, this being accompanied by increasing insulin in the control and Metoprolol, but not the Bupranolol trials. Glycerol increased moderately, while FFA were depressed. Growth hormone showed a delayed increase at 15 and 30 min post exercise. Cortisol was unaffected by exercise. Β-blockade reduced the increases of lactate, glucose, glycerol, insulin, and growth hormone, exaggerated the depression of FFA and had no effect on cortisol. The results demonstrate that the strong sympatho-adrenal response to exercise of this nature is a major determinant of the increase of glucose at cessation of exercise. The hyperglycemia in concert with Β-2-adrenergic stimulation leads to elevation of insulin. Furthermore, lipolysis is controlled by Β-adrenergic stimulation. The delayed increase of growth hormone seems to be triggered by the declining glucose level during recovery.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1439-6327
    Keywords: Catecholamines ; Hormones ; Anaerobic exercise ; Prolonged exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Seventeen male physical education students performed three types of treadmill exercise: (1) progressive exercise to exhaustion, (2) prolonged exercise of 50 min duration at the anaerobic threshold of 4 mmol·1−1 blood lactate (AE), (3) a single bout of short-term high-intensity exercise at 156% of maximal exercise capacity in the progressive test, leading to exhaustion within 1.5 min (ANE). Immediately before and after ANE and before, during, and after AE adrenalin, noradrenalin, growth hormone, cortisol, insulin, testosterone, and oestradiol were determined in venous blood, and glucose and lactate were determined in arterialized blood from the earlobe. Adrenalin and noradrenalin increased 15 fold during ANE and 3–4 fold and 6–9 fold respectively during AE. The adrenalin/noradrenalin ratio was 1∶3 during ANE and 1∶10 during AE. Cortisol increased by 35% in ANE (12% of which appeared in the postexercise period) and 54% in AE. Insulin increased during ANE but decreased during AE. Testosterone and oestradiol increased by 14% and 16% during ANE and by 22% and 28% during AE. The results point to a markedly higher emotional stress and higher sympatho-adrenal activity in anaerobic exercise. Growth hormone and cortisol appear to be the more affected by intense prolonged exercise. Taking plasma volume changes and changes of metabolic clearance rates into consideration, neither of the exercise tests appeared to affect secretion of testosterone and oestradiol.
    Type of Medium: Electronic Resource
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