Document Detail

Effects of treadmill running on plasma beta-endorphin, corticotropin, and cortisol levels in male and female 10K runners.
MedLine Citation:
PMID:  2548864     Owner:  NLM     Status:  MEDLINE    
Reports of plasma beta-endorphin (B-EN) levels in response to submaximal exercise have been highly disparate. Variations in experimental design have complicated interpretation of previous research. The present study was designed to determine whether a sequential change in plasma beta-endorphin (B-EN), corticotropin (ACTH), and cortisol levels occurs in response to a 30-min submaximal run. Twenty-three subjects were divided into four groups: male runners, female runners, sedentary males and sedentary females. Subjects ran on a treadmill at 80% of previously determined maximum heart rate. Five plasma samples were obtained through an indwelling catheter before exercise (-30 and 0 min), at 15 and 30 min of exercise, and after 30 minutes of recovery. The run resulted in no rise in B-EN, ACTH, and cortisol despite an elevated rectal temperature. B-EN values were significantly higher in males than in females (p less than 0.01). No sex or training differences were seen with respect to change of hormone concentrations over the course of the run. Three male runners developed symptoms of vasovagal syncope after the catheter placement and had high initial B-EN, ACTH, and cortisol concentrations which decreased throughout the run. These data indicate that gender and training do not affect ACTH and cortisol concentrations before, during, and after 30 min of treadmill running at 80% of maximum heart rate, whereas B-EN concentrations are higher in males under these conditions.
R R Kraemer; S Blair; G R Kraemer; V D Castracane
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  58     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1989  
Date Detail:
Created Date:  1989-09-25     Completed Date:  1989-09-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  845-51     Citation Subset:  IM    
Exercise Physiology Laboratory Ahearn, Kansas State University, Manhattan 66506.
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MeSH Terms
Adrenocorticotropic Hormone / blood*
Blood Pressure
Body Temperature
Heart Rate
Hydrocortisone / blood*
Physical Exertion
Sex Factors
Time Factors
beta-Endorphin / blood*
Reg. No./Substance:
50-23-7/Hydrocortisone; 60617-12-1/beta-Endorphin; 9002-60-2/Adrenocorticotropic Hormone

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

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