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Dane publikacji

Within-and between-subject variation in the blood testosterone and cortisol concentrations of elite male weightlifters during a 10-day training period

Rozdział
2017 angielski
Liczba arkuszy: 0,1
Link do publicznie dostępnego pełnego tekstu
Cechy publikacji
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  • Rozdział w książce, Abstrakt
  • Zrecenzowana naukowo
  • Konferencyjna
Dyscypliny naukowe
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Nauki o kulturze fizycznej
Dane konferencji
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  1. 10th Baltic Sport Science Conference
  2. 2017-04-26 - 2017-04-28
  3. Ryga, Litwa
Abstrakty ( angielski )
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Aim:The steroid hormones testosterone and cortisol have an established role in mediating training performance and adaptation. To better define their role, we examined the day-to-day biological variability in these hormones among male weightlifters during a short period of training. Subjects: 17 elite male Olympic weightlifters. Methods: The subjects were monitored over a 10-day period of normal training. Daily blood samples were taken in the morning (9.30 am) after breakfast, but before any workout, and assayed for testosterone and cortisol. We examined the within-subject changes and between-subject differences in these hormones, once expressed as coefficients of variation (CV). The group responses were also assessed with the Friedman test and post-hoc comparisons. Results: As a group, some daily changes in testosterone (p=0.026) and cortisol (p<0.01) concentrations emerged. Testosterone increased (p<0.05) by 81% from day 8 to 9, with cortisol increasing from days 3 to 4 (21%) and 2 to 8 (17%). Within these group trends the within-and between-subject CV’s for testosterone were 51±19% and 63±17%, respectively. The corresponding CV’s for cortisol were 15±4% and 18±3%. Conclusions: A short period of Olympic weightlifting- type training was accompanied by infrequent hormonal changes on different days. The profiling of individual athletes also revealed large biological variation in testosterone concentrations, whereas the “stress” hormone cortisol ex hibited much less variability. Thus, testosterone might have an additional role as a biomarker of training stress, exhibiting both trait (between athletes) and state.
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