Document Detail


Performance, biochemical, and endocrine changes during a competitive football game.
MedLine Citation:
PMID:  12439092     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: This study represents the first time that anaerobic power performance was examined during an actual intercollegiate American football game. In addition, biochemical and endocrine responses also were examined to assess the physiological stress imposed by this competitive contest. METHODS: Twenty-one members of a NCAA Division III football team were divided into two groups. Group one (ST) were starters (N = 11). The second group (RS) consisted of red-shirt players (N = 10). Blood samples were obtained 24 h (Pre1) and 2.5 h (Pre2) before the game and within 15 min of game conclusion (IP). Anaerobic power measures were recorded approximately 10 min before kickoff (pre) and following the first (Q1), second (Q2), third (Q3), and fourth (Q4) quarters. RESULTS: Peak force (PF) and power (PP) in both squat and countermovement jumps decreased (P < 0.05) from pre to Q2 in both ST and RS; however, all variables returned to baseline levels by Q4. When averaged across trials, PF and PP in both jumps were greater (P < 0.05) in ST than RS. No significant changes in testosterone concentrations with respect to time or between groups were seen. Cortisol concentrations were significantly higher for ST at IP than RS. No significant changes in creatine kinase, alanine aminotransferase, urea, or uric acid were observed in either group from Pre2 to IP. In addition, no between group differences were seen in these variables. Myoglobin and aspartate aminotransferase significantly increased from Pre2 to IP in ST, and a significant difference in myoglobin concentrations was seen between the groups at IP. CONCLUSIONS: Performance, biochemical, and endocrine changes in these NCAA Division III football players reflected the stress and muscle damage that occurs as a result of a competitive American football game.
Authors:
Jay R Hoffman; Carl M Maresh; Robert U Newton; Martyn R Rubin; Duncan N French; Jeff S Volek; Jason Sutherland; Michael Robertson; Ana L Gómez; Nicholas A Ratamess; Jie Kang; William J Kraemer
Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  34     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-19     Completed Date:  2003-03-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1845-53     Citation Subset:  IM; S    
Affiliation:
Human Performance Laboratory, Department of Health and Exercise Science, The College of New Jersey, Ewing, 08628-0718, USA. hoffmanj@tcnj.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Blood Chemical Analysis
Cohort Studies
Competitive Behavior
Energy Metabolism / physiology
Football / physiology*
Humans
Hydrocortisone / blood*
Male
Physical Endurance / physiology*
Probability
Radioimmunoassay
Task Performance and Analysis
Testosterone / blood*
Chemical
Reg. No./Substance:
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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