Effects of dietary L-arginine intake on cardiorespiratory and metabolic adaptation in athletes

Raul Bescós, Carlos Gonzalez-Haro, Pere Pujol, Franchek Drobnic, Eulalia Alonso, Maria Luisa Santolaria, Olga Ruiz, Marc Esteve, Pedro Galilea

Research output: Indexed journal article Articlepeer-review

33 Citations (Scopus)

Abstract

To assess the effect of diet enrichment with L-arginine or supplementation at high doses on physiological adaptation during exercise, 9 athletes followed 3 different diets, each over 3 consecutive days, with a wash-out period of 4 d between training sessions: control diet (CD), 5.5 ± 0.3 g/d of L-arginine; Diet 1 (rich in L-arginine food), 9.0 ± 1.1 g/d of L-arginine; and Diet 2 (the same as CD but including an oral supplement of 15 g/d), 20.5 ± 0.3 g/d of L-arginine. Plasma nitrate levels of each participant were determined on the day after each treatment. Participants performed a submaximal treadmill test (initial speed 10-11 km/hr, work increments 1 km/hr every 4 min until 85-90% VO2max, and passive recovery periods of 2 min). Oxygen uptake and heart rate were monitored throughout the test. Blood lactate concentration ([La-]b) was determined at the end of each stage. Repeated-measures ANOVA and paired Student's t tests were used to compare the various physiological parameters between diets. The level of significance was set at p < .05. [La -]b showed a significant effect at the 5-min time point between CD and Diet 2 (CD 3.0 ± 0.5 mM, Diet 2 2.5 ± 0.5 mM, p = .03), but this tendency was not found at higher exercise intensities. No significant differences were observed in any of the cardiorespiratory or plasma nitrate levels. In conclusion, dietary L-arginine intake on the days preceding the test does not improve physiological parameters during exercise.

Original languageEnglish
Pages (from-to)355-365
Number of pages11
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume19
Issue number4
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Amino acid
  • Blood lactate concentration
  • Heart rate
  • Nitric oxide
  • Oxygen uptake

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