Document Detail

Sperm characteristics of endurance trained cyclists.
MedLine Citation:
PMID:  15162242     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to investigate the influence of cycling on sperm characteristics. Twenty subjects volunteered for the study, comprising 10 long distance competitive cyclists (median 25.5 y) and 10 sedentary controls (median 24.5 y). A questionnaire was used to obtain a history of training, health, nutrition and life style. Semen analysis consisted of a detailed evaluation of sperm characteristics that included semen volume, sperm count, viability, motility and morphology. Compared to controls, the cyclists had a significantly lower proportion of spermatozoa with normal morphology (medians: 41.5 % versus 19.5 %; p < 0.01) and a significantly higher proportion of morphologically abnormal tapered forms (medians: 4.5 % versus 22.5 %; p < 0.01). No significant difference in semen volume and sperm motility, viability and count was observed between the two groups. We concluded that endurance cycling appears to be associated with a significant alteration in sperm morphology.
Y Gebreegziabher; E Marcos; W McKinon; G Rogers
Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  International journal of sports medicine     Volume:  25     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-26     Completed Date:  2004-09-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  247-51     Citation Subset:  IM    
School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown, South Africa.
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MeSH Terms
Bicycling / physiology*
Cell Survival / physiology
Exercise / physiology*
Physical Endurance / physiology*
Reference Values
Semen / cytology,  physiology
Sperm Count
Spermatogenesis / physiology*
Spermatozoa / cytology,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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