Document Detail

Effect of amino acid mixture intake on physiological responses and rating of perceived exertion during cycling exercise.
MedLine Citation:
PMID:  12831267     Owner:  NLM     Status:  MEDLINE    
This study examined the effects of an amino acid mixture supplement on physiological response and ratings of perceived exertion during submaximal cycle-ergometer exercise in 15 healthy, untrained male students. Subjects performed submaximal sustained exercise (oxygen uptake at anaerobic threshold: 54.6 +/- 12.5% of maximum oxygen uptake capacity) with a cycle-ergometer ride for 60 min. after resting for 1 min. and unloaded cycling for 2 min. They drank either a 380-ml supplement containing vespa amino acids or a lemon-flavored placebo at 30 min. before starting exercise in a double-blind design. The subjects participated in both experiments over a 1-wk. interval. Oxygen uptake, respiratory exchange ratio, heart rate, ratings of perceived exertion, and plasma lactate concentration were measured during the exercise. The change-rate of respiratory exchange ratio for the Supplement group was significantly lower than that for the Placebo group at 10 min. after starting exercise. The change-rate of the ratings of perceived exertion for the Supplement group was significantly lower than that for the Placebo group at 50 min. after starting exercise. There were no significant changes in the rates in oxygen uptake, heart rate, and plasma lactate concentration between groups. We inferred that ingesting the supplement before starting exercise has a significant effect on the respiratory exchange ratio and ratings of perceived exertion during submaximal sustained exercise for 60 min. but not on oxygen uptake, heart rate, and plasma lactate concentration.
Shinichi Demura; Yoshinori Nagasawa; Tamotsu Kitabayashi; Jinzaburo Matsuzawa
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Perceptual and motor skills     Volume:  96     ISSN:  0031-5125     ISO Abbreviation:  Percept Mot Skills     Publication Date:  2003 Jun 
Date Detail:
Created Date:  2003-06-30     Completed Date:  2003-10-03     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401131     Medline TA:  Percept Mot Skills     Country:  United States    
Other Details:
Languages:  eng     Pagination:  883-95     Citation Subset:  IM    
Kanazawa University.
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MeSH Terms
Amino Acids / administration & dosage*,  pharmacology*
Dietary Supplements*
Exercise Test / drug effects*
Heart Rate / drug effects*
Lactic Acid / blood,  metabolism*
Oxygen Consumption
Physical Exertion / drug effects*
Reg. No./Substance:
0/Amino Acids; 50-21-5/Lactic Acid

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

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