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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
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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 |
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| 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: | 04 Sep 2021 10:53 |
| DOI or ID number: | 10.1123/ijsnem.2016-0228 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/7752 |
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