Document Detail

Post-prandial changes in measures of fatigue: effect of a mixed or a pure carbohydrate or pure fat meal.
MedLine Citation:
PMID:  9426358     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To assess the changes in measures of fatigue after meals of varying composition, and to compare the relation of the fatigue with changes in the plasma tryptophan:large neutral amino acids (Trp:LNAA) ratio. SUBJECTS: Sixteen healthy volunteers were recruited from staff and students at the College. DESIGN: Subjects were tested for central and peripheral fatigue using a visual analogue scale, flicker fusion frequency, grip strength, reaction time and wrist ergometry. In addition, plasma amino acid concentrations and Trp:LNAA ratio were determined. Measurements were made before, and at 1, 2, 3 and 4 h after drinking one of three liquid test meals. The meals were isoenergetic (1672 kJ) and were of mixed carbohydrate, fat and protein, or of pure carbohydrate or pure fat. SETTING: Department of Human Nutrition. RESULTS: Subjects consuming the pure carbohydrate meal reported more subjective feelings of fatigue and had slower reaction times. Aspects of central fatigue were greater in subjects consuming a pure fat meal. The Trp:LNAA ratio was depressed in those consuming a pure fat or mixed meal and raised only after pure carbohydrate. CONCLUSIONS: Central and subjective fatigue may be influenced by raised plasma free tryptophan to competitor amino acid ratios induced by carbohydrate intake but other aspects of central arousal are affected by fat intake.
A Cunliffe; O A Obeid; J Powell-Tuck
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of clinical nutrition     Volume:  51     ISSN:  0954-3007     ISO Abbreviation:  Eur J Clin Nutr     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-01-30     Completed Date:  1998-01-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8804070     Medline TA:  Eur J Clin Nutr     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  831-8     Citation Subset:  IM    
Department of Human Nutrition, St Bartholomew's, London.
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MeSH Terms
Dietary Carbohydrates / pharmacology*
Dietary Fats / pharmacology*
Fatigue / blood,  etiology*
Flicker Fusion
Hand Strength
Middle Aged
Pain Measurement
Postprandial Period / physiology*
Tryptophan / blood*
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Fats; 73-22-3/Tryptophan

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