The Effect of Acute Nitrate-Rich Beetroot Juice Supplementation upon Oxygen Uptake during High-Intensity Interval Exercise
Cardiff Metropolitan University
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Acute dietary nitrate (NO3 -) supplementation in the form of beetroot juice (BRJ) has been shown to have inconsistent effects on oxygen consumption during low- and high-intensity exercise (HIE). However, research has not detailed the effects of NO3 - supplementation during high-intensity interval exercise. Therefore, the aim of this study was to examine the effect of an acute dose of NO3 --rich BRJ on ventilatory and gas dynamics during a HIE protocol. Seven physically active individuals (20 ± 1 yr, VO2max 40.8 ± 10.3 ml.kg-1. min-1) participated in a single-blind, repeated-measures design. They ingested 70 ml of BRJ (~4.0 mmol NO3 -) or a placebo of low NO3 - blackcurrant squash 2.5 hr before a 16-min HIE protocol. HIE consisted of 8 x 60s bouts of high-intensity (90% Wmax) work separated by 60s low intensity work bouts (50% Wmax). A 48 hr wash-out period separated the two trials. Oxygen uptake, carbon dioxide output, ventilatory equivalents for oxygen and carbon dioxide, respiratory exchange ratio minute ventilation and heart rate were collected throughout for analysis. The effects of beetroot juice supplementation were measured using two-way analysis of covariance. There was no significant difference between BRJ and PLC during 90% Wmax or 50% Wmax upon oxygen uptake (P < 0.431 vs 0.757). The findings of this study indicate that an acute dose of concentrated BRJ does not affect oxygen uptake during an HIE protocol in physically active individuals.
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