Facial reconstruction

Search LJMU Research Online

Browse Repository | Browse E-Theses

Single and Combined Effects of Beetroot Crystals and Sodium Bicarbonate on 4-km Cycling Time Trial Performance

Callahan, MJ, Parr, EB, Hawley, JA and Burke, LM (2017) Single and Combined Effects of Beetroot Crystals and Sodium Bicarbonate on 4-km Cycling Time Trial Performance. International Journal of Sport Nutrition and Exercise Metabolism, 27 (3). ISSN 1526-484X

[img]
Preview
Text
Single and Combined Effects of Beetroot Crystals and Sodium Bicarbonate on 4-km Cycling Time Trial Performance1.pdf - Accepted Version

Download (1MB) | Preview

Abstract

When ingested alone, beetroot juice and sodium bicarbonate are ergogenic for high-intensity exercise performance. This study sought to determine the independent and combined effects of these supplements. Eight endurance trained (VO2max 65 mL·kg·min-1) male cyclists completed four × 4-km time trials (TT) in a doubleblind Latin square design supplementing with beetroot crystals (BC) for 3 days (15 g·day-1 + 15 g 1 h before TT, containing 300 mg nitrate per 15 g), bicarbonate (Bi 0.3 g·kg-1 body mass [BM] in 5 doses every 15 min from 2.5 h before TT); BC+Bi or placebo (PLA). Subjects completed TTs on a Velotron cycle ergometer under standardized laboratory conditions. Plasma nitrite concentrations were significantly elevated only in the BC+Bi trial before the TT (1520 ± 786 nmol·L-1) compared with baseline (665 ± 535 nmol·L-1, p = .02) and the Bi and PLA conditions (Bi: 593 ± 203 nmol·L-1, p < .01; PLA: 543 ± 369 nmol·L-1, p < .01). Plasma nitrite concentrations were not elevated in the BC trial before the TT (1102 ± 218 nmol·L-1) compared with baseline (975 ± 607 nmol·L-1, p > .05). Blood bicarbonate concentrations were increased in the BC+Bi and Bi trials before the TT (BC+Bi: 30.9 ± 2.8 mmol·L-1; Bi: 31.7 ± 1.1 mmol·L-1). There were no differences in mean power output (386–394 W) or the time taken to complete the TT (335.8–338.1 s) between any conditions. Under the conditions of this study, supplementation was not ergogenic for 4-km TT performance.

Item Type: Article
Additional Information: As accepted for publication in International Journal of Sport Nutrition and Exercise Metabolism on 1/6/17 at: http://dx.doi.org/10.1123/ijsnem.2016-0228
Uncontrolled Keywords: 1106 Human Movement And Sports Science
Subjects: Q Science > QD Chemistry
Q Science > QP Physiology
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Human Kinetics
Related URLs:
Date Deposited: 03 Jan 2018 11:48
Last Modified: 08 Sep 2018 04:15
DOI or Identification number: 10.1123/ijsnem.2016-0228
URI: http://researchonline.ljmu.ac.uk/id/eprint/7752

Actions (login required)

View Item View Item