Document Detail


Influence of dietary carbohydrate intake on the free testosterone: cortisol ratio responses to short-term intensive exercise training.
MedLine Citation:
PMID:  20091182     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study examined the effect of dietary carbohydrate (CHO) consumption on the free testosterone to cortisol (fTC) ratio during a short-term intense micro-cycle of exercise training. The fTC ratio is a proposed biomarker for overreaching-overtraining (i.e., training stress or imbalance) in athletes. The ratio was studied in two groups, control-CHO (approximately 60% of daily intake, n = 12) and low-CHO (approximately 30% of daily intake, n = 8), of male subjects who performed three consecutive days of intensive training (approximately 70-75% maximal oxygen consumption, 60 min per day) with a dietary intervention (on the day before and during training). Resting, pre-exercise blood samples were collected under standardized-controlled conditions before each day of training (Pre 1, 2, 3) and on a fourth day after the micro-cycle (Rest). Bloods were analyzed for free testosterone and cortisol via radioimmunoassay procedures. Subjects performed no additional physical activity other than prescribed training. Statistical analysis (ANCOVA) revealed the fTC ratio decreased significantly (p < 0.01) from pre-study resting measurement (Pre 1) to the final post-study resting measurement (Rest) in the low-CHO group (-43%), but no change occurred (p > 0.05) in the control-CHO group (-3%). Findings suggest if the fTC ratio is utilized as a marker of training stress or imbalance it is necessary for a moderately high diet of CHO to be consumed to maintain validity of any observed changes in the ratio value.
Authors:
Amy R Lane; Joseph W Duke; Anthony C Hackney
Publication Detail:
Type:  Journal Article     Date:  2009-12-20
Journal Detail:
Title:  European journal of applied physiology     Volume:  108     ISSN:  1439-6327     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-22     Completed Date:  2010-06-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1125-31     Citation Subset:  IM    
Affiliation:
Endocrine Section, Applied Physiology Laboratory, Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, NC 27599, USA.
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MeSH Terms
Descriptor/Qualifier:
Dietary Carbohydrates / metabolism*
Eating / physiology
Exercise / physiology*
Humans
Hydrocortisone / blood*
Male
Physical Endurance / physiology*
Physical Exertion / physiology*
Physical Fitness / physiology*
Testosterone / blood*
Young Adult
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 50-23-7/Hydrocortisone; 58-22-0/Testosterone

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


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