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12.02.2019 | Original Article

Effects of chronic beetroot juice supplementation on maximum oxygen uptake, velocity associated with maximum oxygen uptake, and peak velocity in recreational runners: a double-blinded, randomized and crossover study

verfasst von: Talitha F. de Castro, Francisco de Assis Manoel, Diogo H. Figueiredo, Diego H. Figueiredo, Fabiana Andrade Machado

Erschienen in: European Journal of Applied Physiology | Ausgabe 5/2019

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Abstract

Purpose

This study investigated the effects of chronic 3-day beetroot juice (BRJ) supplementation on maximum oxygen uptake (VO_2max), velocity associated with VO_2max(vVO_2max), and peak velocity (V_peak) in recreational runners.

Methods

Thirteen male recreational runners (age 28.2 ± 3.0 years, height 176.8 ± 0.1 cm, body mass 74.4 ± 9.5 kg) performed four tests on a treadmill in a randomized, double-blind, crossover design: two maximum incremental tests to determine VO_2max and vVO_2max, and two tests to determine V_peak. Trials were performed following 3 days of supplementation of NO₃⁻-rich BRJ in natura (8.4 mmol NO₃⁻ day^− 1) or BRJ NO₃⁻-depleted placebo (0.01 mmol NO₃⁻ day^− 1), with the last dose being ingested 2 h before each test. During the tests, maximum heart rate (HR_max), maximal rating of perceived exertion (RPE_max), pre- and post-test glucose concentrations (Gluc_pre, Gluc_post), and peak blood lactate concentration were determined.

Results

VO_2max was higher following BRJ vs PLA (46.6 ± 6.4 vs 45.1 ± 5.8 mL kg^− 1 min^− 1; P = 0.022), as well as vVO_2max (14.5 ± 0.8 vs 13.9 ± 1.0 km h^− 1P = 0.024) and V_peak (15.5 ± 1.1 vs 15.2 ± 1.2 km h^− 1P = 0.038), with no differences in the other variables.

Conclusion

Consumption of NO₃⁻-rich BRJ in natura (8.4 mmol NO₃⁻ day^− 1) once per day for 3 days improved VO_2max, vVO_2max and V_peak in recreational runners without changing the other analyzed variables.

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Titel: Effects of chronic beetroot juice supplementation on maximum oxygen uptake, velocity associated with maximum oxygen uptake, and peak velocity in recreational runners: a double-blinded, randomized and crossover study
verfasst von: Talitha F. de Castro
Francisco de Assis Manoel
Diogo H. Figueiredo
Diego H. Figueiredo
Fabiana Andrade Machado
Publikationsdatum: 12.02.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 5/2019
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-019-04094-w

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