Event Title
Effect of Cold Exposure on the Muscle Metaboreflex During L-tyrosine Supplementation
Presentation Type
Poster/Portfolio
Presenter Major(s)
Exercise Science
Mentor Information
James Lang
Department
Movement Science
Location
Henry Hall Atrium 27
Start Date
10-4-2013 1:00 PM
End Date
10-4-2013 2:00 PM
Keywords
Health
Abstract
Significance: The L-tyrosine pool within sympathetic nerve terminals that is available for catecholamine synthesis may limit sympathetic function. After supplementation of L-tyrosine, the sympathetically-mediated vasoconstriction response during cold exposure was increased in aged skin. Purpose: To investigate oral supplementation of 150 mg/kg of L-tyrosine on the metaboreflex-mediated blood pressure response during passive whole body cooling. Protocol: Subjects performed isometric exercise using a handgrip dynamometer for 2 min at 35% maximal voluntary contraction. Five seconds before exercise ended, a blood pressure cuff was inflated to suprasystolic pressure to trap vasoactive metabolites within the forearm for an additional 3 min. The test was then repeated after whole body cooling to a mean skin temperature of 30.5 C. Anticipated Results: Supplementation of L-tyrosine prior to whole-body cooling will result in an increase in the metaboreflex-mediated blood pressure response.
Effect of Cold Exposure on the Muscle Metaboreflex During L-tyrosine Supplementation
Henry Hall Atrium 27
Significance: The L-tyrosine pool within sympathetic nerve terminals that is available for catecholamine synthesis may limit sympathetic function. After supplementation of L-tyrosine, the sympathetically-mediated vasoconstriction response during cold exposure was increased in aged skin. Purpose: To investigate oral supplementation of 150 mg/kg of L-tyrosine on the metaboreflex-mediated blood pressure response during passive whole body cooling. Protocol: Subjects performed isometric exercise using a handgrip dynamometer for 2 min at 35% maximal voluntary contraction. Five seconds before exercise ended, a blood pressure cuff was inflated to suprasystolic pressure to trap vasoactive metabolites within the forearm for an additional 3 min. The test was then repeated after whole body cooling to a mean skin temperature of 30.5 C. Anticipated Results: Supplementation of L-tyrosine prior to whole-body cooling will result in an increase in the metaboreflex-mediated blood pressure response.