| 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. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Genetic diversity analysis of Sclerotinia sclerotiorum causing stem rot in chickpea using RAPD, ITS-...
Next Document: Position effects of single vacancy on transport properties of single layer armchair h-BNC heterostru...