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Title: Beetroot juice ingestion during prolonged moderate-intensity exercise attenuates progressive rise in O2 uptake
Authors: Tan, Rachel
Wylie, Lee J.
Thompson, Christopher
Blackwell, Jamie R.
Bailey, Stephen J.
Vanhatalo, Anni
Jones, Andrew M.
Keywords: Nitric oxide
Efficiency
Glycogen depletion
Substrate utilization
Oxygen consumption
Performance
Issue Date: 2018
Publisher: 漏 American Physiological Society
Citation: TAN, R. ... et al, 2018. Beetroot juice ingestion during prolonged moderate-intensity exercise attenuates progressive rise in O2 uptake. Journal of Applied Physiology, 124(5), pp. 1254-1263.
Abstract: Nitrate-rich beetroot juice (BR) supplementation increases biomarkers of nitric oxide bioavailability with implications for the physiological responses to exercise. We hypothesized that BR supplementation before and during prolonged moderate-intensity exercise would: maintain an elevated plasma nitrite concentration ([NO2-]), attenuate the expected progressive increase in 饾憠饾憠虈O2 over time, and improve performance in a subsequent time trial (TT). In a double-blind, randomized, crossover design, 12 males completed 2-h of moderate-intensity cycle exercise followed by a 100 kJ TT in three conditions: 1) BR before and 1-h into exercise (BR+BR); 2) BR before and placebo (PL) 1-h into exercise (BR+PL); and 3) PL before and 1-h into exercise (PL+PL). During the 2-h moderate-intensity exercise bout, plasma [NO2-] declined by ~17% in BR+PL but increased by ~8% in BR+BR such that, at 2-h, plasma [NO2-] was greater in BR+BR than both BR+PL and PL+PL (P<0.05). 饾憠饾憠虈O2 was not different between conditions over the first 90 min of exercise, but was lower at 120 min in BR+BR (1.73 卤 0.24 L路min-1) compared to BR+PL (1.80 卤 0.21 L路min-1; P=0.08) and PL+PL (1.83 卤 0.27 L路min-1; P<0.01). The decline in muscle [glycogen] over the 2-h exercise bout was attenuated in BR+BR (~28% decline) compared to BR+PL (~44% decline) and PL+PL (~44% decline; n = 9, P<0.05). TT performance was not different between conditions (P>0.05). BR supplementation before and during prolonged moderate-intensity exercise attenuated the progressive rise in 饾憠饾憠虈O2 over time and appeared to reduce muscle glycogen depletion but did not enhance subsequent TT performance.
Description: This paper is closed access until 4th Jan 2019
Version: Accepted for publication
DOI: 10.1152/japplphysiol.01006.2017
URI: https://dspace.lboro.ac.uk/2134/27963
Publisher Link: https://doi.org/10.1152/japplphysiol.01006.2017
ISSN: 8750-7587
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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