Document Detail

The effect of exhaustion exercise on thyroid hormones and testosterone levels of elite athletes receiving oral zinc.
MedLine Citation:
PMID:  16648789     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The present study aims to investigate how exhaustion exercise affects thyroid hormones and testosterone levels in elite athletes who are supplemented with oral zinc sulfate for 4 weeks. METHODS: The study included 10 male wrestlers, who had been licensed wrestlers for at least 6 years. Mean age of the wrestlers who volunteered in the study was 18.70 +/- 2.4 years. All subjects were supplemented with oral zinc sulfate (3 mg/kg/day) for 4 weeks in addition to their normal diet. Thyroid hormone and testosterone levels of all subjects were determined as resting and exhaustion before and after zinc supplementation. RESULTS: Resting TT3, TT4, FT3, FT4 and TSH levels of subjects were higher than the parameters measured after exhaustion exercise before zinc supplementation (p<0.05). Both resting and exhaustion TT3, TT4 and FT3 values after 4-week zinc supplementation were found significantly higher than both of the parameters (resting and exhaustion) measured before zinc supplementation (p<0.05). Resting total testosterone and free testosterone levels before zinc supplementation were significantly higher than exhaustion levels before zinc supplementation (p<0.05). Both resting and exhaustion total and free testosterone levels following 4-week zinc supplementation were found significantly higher than the levels (both resting and exhaustion) measured before zinc supplementation (p<0.05). CONCLUSION: Findings of our study demonstrate that exhaustion exercise led to a significant inhibition of both thyroid hormones and testosterone concentrations, but that 4-week zinc supplementation prevented this inhibition in wrestlers. In conclusion, physiological doses of zinc administration may benefit performance.
Mehmet Kilic; Abdulkerim Kasim Baltaci; Mehmet Gunay; Hakki Gökbel; Nilsel Okudan; Ibrahim Cicioglu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Neuro endocrinology letters     Volume:  27     ISSN:  0172-780X     ISO Abbreviation:  Neuro Endocrinol. Lett.     Publication Date:    2006 Feb-Apr
Date Detail:
Created Date:  2006-12-13     Completed Date:  2007-01-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8008373     Medline TA:  Neuro Endocrinol Lett     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  247-52     Citation Subset:  IM    
School of Physical Education and Sports, Selçuk University, Konya, Turkey.
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MeSH Terms
Exercise / physiology*
Exercise Test
Testosterone / blood*
Thyroid Hormones / blood*
Thyrotropin / blood
Thyroxine / blood
Triiodothyronine / blood
Wrestling / physiology
Zinc / pharmacology*
Reg. No./Substance:
0/Thyroid Hormones; 58-22-0/Testosterone; 6893-02-3/Triiodothyronine; 7440-66-6/Zinc; 7488-70-2/Thyroxine; 9002-71-5/Thyrotropin

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