A1 Refereed original research article in a scientific journal
Effects of endurance training on hormonal responses to prolonged physical exercise in males
Authors: Vasankari TJ, Kujala UM, Heinonen OJ, Huhtaniemi IT
Publication year: 1993
Journal: Acta endocrinologica
Journal name in source: Acta endocrinologica
Journal acronym: Acta Endocrinol (Copenh)
Volume: 129
Issue: 2
First page : 109
Last page: 13
Number of pages: 5
ISSN: 0001-5598
DOI: https://doi.org/10.1530/acta.0.1290109
Abstract
The effect of several years' endurance training on hormonal changes during acute prolonged physical exercise was studied. In trial I, 13 cross-country skiers were studied before and after a 75-km ski race and 3 weeks later on a control day. In trial II, 10 trained and 8 untrained subjects bicycled for 4 h on the road with as high a performance level as possible. Venous blood samples were taken in both trials before and after the exercise. In trial I, serum concentrations of luteinizing hormone (p < 0.01) and follicle-stimulating hormone (FSH, p < 0.001) decreased more from morning to afternoon samples, and cortisol (p < 0.001) and growth hormone (GH, p < 0.001) increased more during the ski race when compared to the control day. Serum testosterone decreased during the ski race (p < 0.01) but not on the control day. In trial II, a group difference was seen in serum FSH levels which was higher in the trained than untrained subjects at all three time points (F = 4.66, p = 0.046). A significant trial-group interaction (p = 0.020) was seen in GH, the GH being lower before exercise and higher 2 h after exercise in the untrained subjects. There was a significant group contrast between pre- and post-exercise samples in testosterone (p = 0.021) and cortisol (p = 0.022). In conclusion, the higher basal FSH concentration in the trained versus untrained subjects may be a sign of compensated hypogonadism due to intensive chronic training or it may be due to dysfunction of Sertoli cells.(ABSTRACT TRUNCATED AT 250 WORDS)
The effect of several years' endurance training on hormonal changes during acute prolonged physical exercise was studied. In trial I, 13 cross-country skiers were studied before and after a 75-km ski race and 3 weeks later on a control day. In trial II, 10 trained and 8 untrained subjects bicycled for 4 h on the road with as high a performance level as possible. Venous blood samples were taken in both trials before and after the exercise. In trial I, serum concentrations of luteinizing hormone (p < 0.01) and follicle-stimulating hormone (FSH, p < 0.001) decreased more from morning to afternoon samples, and cortisol (p < 0.001) and growth hormone (GH, p < 0.001) increased more during the ski race when compared to the control day. Serum testosterone decreased during the ski race (p < 0.01) but not on the control day. In trial II, a group difference was seen in serum FSH levels which was higher in the trained than untrained subjects at all three time points (F = 4.66, p = 0.046). A significant trial-group interaction (p = 0.020) was seen in GH, the GH being lower before exercise and higher 2 h after exercise in the untrained subjects. There was a significant group contrast between pre- and post-exercise samples in testosterone (p = 0.021) and cortisol (p = 0.022). In conclusion, the higher basal FSH concentration in the trained versus untrained subjects may be a sign of compensated hypogonadism due to intensive chronic training or it may be due to dysfunction of Sertoli cells.(ABSTRACT TRUNCATED AT 250 WORDS)
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