Document Detail


Tyrosine Supplementation does not Influence the Capacity to Perform Prolonged Exercise in a Warm Environment.
MedLine Citation:
PMID:  22805972     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Eight males were recruited to a study designed to examine the effect of tyrosine supplementation on the capacity to perform prolonged exercise in a warm environment. Subjects entered the laboratory in the morning and remained seated for 1 h before cycling to exhaustion at 70% VO2 peak. Two 250 mL aliquots of a placebo or a tyrosine solution were ingested at 30 min intervals prior to exercise, with an additional 150 mL consumed every 15 min throughout exercise (total tyrosine dose: 150 mg/kg BM). Cognitive function was assessed prior to drink ingestion, at the end of the rest period and at exhaustion. Tyrosine ingestion had no effect on exercise capacity (placebo 61.4 ± 13.7 min; TYR 60.2 ± 15.4 min; P = 0.505). No differences in heart rate (P = 0.380), core temperature (P = 0.554), or weighted mean skin temperature (P = 0.167) were apparent between trials. Ingestion of tyrosine produced a marked increase in serum tyrosine concentrations (+236 ± 46μmol/L); P < 0.001) with this difference maintained throughout exercise. No change was apparent during the placebo trial (P = 0.924). Exercise caused an increase in error rate during the complex component of the Stroop test (P = 0.034), but this response was not influenced by the drink ingested. No other component of cognitive function was altered by the protocol (all P > 0.05). Ingestion of a tyrosine solution did not influence time to exhaustion or several aspects of cognitive function when exercise was undertaken in a warm environment.
Authors:
Phillip Watson; Sophie Enever; Andrew Page; Jenna Stockwell; Ronald J Maughan
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-4
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, United Kingdom.
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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