Document Detail

Preexercise meal composition alters plasma large neutral amino acid responses during exercise and recovery.
MedLine Citation:
PMID:  8901801     Owner:  NLM     Status:  MEDLINE    
This study was designed to determine the effect of ingesting three preexercise meals on energy metabolism during exercise and recovery and to relate metabolic perturbations to subjective and objective measurements associated with central fatigue. Twelve subjects consumed isoenergetic meals consisting of oat, wheat, or corn cereals 90 min before cycling. A fasting trial served as the control. Blood samples and cognitive function, perceived hunger, and sleepiness measurements were obtained before and after feeding and during recovery when self-selected food intake was also measured. After meal ingestion, plasma insulin was lower for oat than for wheat or corn whereas the ratio of tryptophan to large neutral amino acids (LNAAs) for corn was less than for all others. During exercise, the tryptophan-LNAA ratio increased from preexercise values for the fasting and wheat trials, but exercise performance was unaffected. During recovery, tryptophan:LNAA increased from postexercise values in fasting trials. Also, hunger and fatigue ratings were greater in fasted subjects, but self-selected food intake measured at the end of the recovery period was not different among groups. We conclude that preexercise meal consumption affected tryptophan:LNAA before, during, and after exercise, but these changes were not sufficient to alter physical and cognitive performance.
G L Paul; J T Rokusek; G L Dykstra; R A Boileau; D K Layman
Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  64     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  1996 Nov 
Date Detail:
Created Date:  1996-12-17     Completed Date:  1996-12-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  778-86     Citation Subset:  AIM; IM    
Division of Nutritional Sciences, University of Illinois, Urbana, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Affect / physiology
Amino Acids / blood*
Analysis of Variance
Avena sativa / standards
Cognition / physiology
Cross-Sectional Studies
Diet / standards*
Dinoprostone / metabolism
Double-Blind Method
Energy Intake / physiology
Energy Metabolism / physiology
Exercise / physiology*
Fatigue / physiopathology
Fatty Acids / blood
Insulin / blood
Interleukin-2 / metabolism
Physical Exertion / physiology
Satiation / physiology
Triticum / standards
Tryptophan / blood*
Zea mays / standards
Reg. No./Substance:
0/Amino Acids; 0/Fatty Acids; 0/Interleukin-2; 11061-68-0/Insulin; 363-24-6/Dinoprostone; 73-22-3/Tryptophan

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

Previous Document:  Natural killer cell activity in elderly men is enhanced by beta-carotene supplementation.
Next Document:  Herman Award Lecture, 1996: relation of metabolic studies to clinical nutrition--the example of burn...