Beetroot juice improves on-water 500 M time-trial performance, and laboratory-based paddling economy in national and international-level kayak athletes
Journal article
Peeling, Peter, Cox, Gregory R., Bullock, Nicola and Burke, Louise Mary. (2015). Beetroot juice improves on-water 500 M time-trial performance, and laboratory-based paddling economy in national and international-level kayak athletes. International Journal of Sport Nutrition and Exercise Metabolism. 25(3), pp. 278 - 284. https://doi.org/10.1123/ijsnem.2014-0110
Authors | Peeling, Peter, Cox, Gregory R., Bullock, Nicola and Burke, Louise Mary |
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Abstract | We assessed the ingestion of a beetroot juice supplement (BR) on 4-min laboratory-based kayak performance in national level male (n = 6) athletes (Study A), and on 500 m on-water kayak time-trial (TT) performance in international level female (n = 5) athletes (Study B). In Study A, participants completed three laboratory-based sessions on a kayak ergometer, including a 7 × 4 min step test, and two 4 min maximal effort performance trials. Two and a half hours before the warm-up of each 4 min performance trial, athletes received either a 70 ml BR shot containing ~4.8 mmol of nitrate, or a placebo equivalent (BRPLA). The distance covered over the 4 min TT was not different between conditions; however, the average VO2 over the 4 min period was significantly lower in BR (p = .04), resulting in an improved exercise economy (p = .05). In Study B, participants completed two field-based 500 m TTs, separated by 4 days. Two hours before each trial, athletes received either two 70 ml BR shots containing ~9.6 mmol of nitrate, or a placebo equivalent (BRPLA). BR supplementation significantly enhanced TT performance by 1.7% (p = .01). Our results show that in national-level male kayak athletes, commercially available BR shots (70 ml) containing ~4.8 mmol of nitrate improved exercise economy during laboratory-based tasks predominantly reliant on the aerobic energy system. Furthermore, greater volumes of BR (140 ml; ~9.6 mmol nitrate) provided to international-level female kayak athletes resulted in enhancements to TT performance in the field. |
Keywords | nitrate; supplement; athlete performance |
Year | 2015 |
Journal | International Journal of Sport Nutrition and Exercise Metabolism |
Journal citation | 25 (3), pp. 278 - 284 |
Publisher | Human Kinetics, Inc. |
ISSN | 1526-484X |
Digital Object Identifier (DOI) | https://doi.org/10.1123/ijsnem.2014-0110 |
Scopus EID | 2-s2.0-84940517576 |
Page range | 278 - 284 |
Research Group | Mary MacKillop Institute for Health Research |
Publisher's version | File Access Level Controlled |
Place of publication | United States |
https://acuresearchbank.acu.edu.au/item/8907y/beetroot-juice-improves-on-water-500-m-time-trial-performance-and-laboratory-based-paddling-economy-in-national-and-international-level-kayak-athletes
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