Oral L-citrulline supplementation attenuates blood pressure response to cold pressor test in young men

Arturo Figueroa, Julian A. Trivino, Marcos A. Sanchez-Gonzalez, Florence Vicil

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44 Scopus citations

Abstract

Background Oral L-citrulline is efficiently converted to L-arginine, which has been shown to decrease brachial blood pressure (BP) at rest and during the cold pressor test (CPT). However, aortic BP may better reflect cardiovascular risk than brachial BP. The purpose of this study was to test the hypothesis that oral L-citrulline supplementation attenuates brachial BP and aortic hemodynamic responses to CPT. Methods Brachial BP, aortic BP, stroke volume (SV), and wave reflection at rest and during CPT were evaluated in 17 young (21.6 ±0.9 years) normotensive men. Subjects were randomly assigned to 4 weeks of oral L-citrulline (6g/day) or placebo in a crossover design. Hemodynamic responses to CPT were reevaluated after each treatment. Results During CPT, there were significant (P <0.05) increases in brachial and aortic BP systolic (SBP), diastolic (DBP), and pulse pressure (PP), augmentation index (AIx), SV, and a decrease in transit time of the reflected wave (Tr) from baseline. Compared to placebo, oral L-citrulline treatment decreased (P <0.05) brachial SBP (-6 ±11 mmHg), aortic SBP (-4 ±10mmHg), and aortic PP (-3 6 plusmn;mmHg) during CPT but not at rest. There was an inverse correlation (r = 0.40, P <0.05) between changes in aortic SBP and Tr during CPT after L-citrulline supplementation.ConclusionsWe conclude that oral L-citrulline supplementation attenuates the brachial SBP, aortic SBP, and aortic PP responses to CPT in young normotensive men. Increased wave reflection time contributes to the reduction in aortic SBP response to CPT.

Original languageEnglish
Pages (from-to)12-16
Number of pages5
JournalAmerican journal of hypertension
Volume23
Issue number1
DOIs
StatePublished - Jan 2010

Keywords

  • Aortic blood pressure
  • Blood pressure
  • Cold pressor test
  • Hemodynamics
  • Hypertension
  • L-citrulline
  • Pulse wave analysis

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