Lookup NU author(s): Dr Oliver Shannon,
Dr Mario Siervo
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© 2017 The Author(s)Purpose: This study evaluated the effects of dietary nitrate (NO3−) supplementation on physiological functioning and exercise performance in trained runners/triathletes conducting short and longer-distance treadmill running time-trials (TT). Method: Eight trained male runners or triathletes completed four exercise performance tests comprising a 10 min warm up followed by either a 1500 or 10,000 m treadmill TT. Exercise performance tests were preceded 3 h before the exercise by supplementation with either 140 ml concentrated nitrate-rich (~12.5 mmol nitrate) (BRJ) or nitrate-deplete (~0.01 mmol nitrate) (PLA) beetroot juice. Results: BRJ supplementation significantly elevated plasma [NO2−] (P < 0.05). Resting blood pressure and exercise (Formula presented.) were not significantly different between BRJ and PLA (P > 0.05). However, post-exercise blood [lactate] was significantly greater in BRJ following the 1500 m TT (6.6 ± 1.2 vs. 6.1 ± 1.5 mM; P < 0.05), but not significantly different between conditions in the 10,000 m TT (P > 0.05). Performance in the 1500 m TT was significantly faster in BRJ vs. PLA (319.6 ± 36.2 vs. 325.7 ± 38.8 s; P < 0.05). Conversely, there was no significant difference in 10,000 m TT performance between conditions (2643.1 ± 324. 1 vs. 2649.9 ± 319.8 s, P > 0.05). Conclusion: Acute BRJ supplementation significantly enhanced 1500 m, but not 10,000 m TT performance. These findings suggest that BRJ might be ergogenic during shorter distance TTs which allow for a high work rate, but not during longer distance TTs, completed at a lower work rate.
Author(s): Shannon OM, Barlow MJ, Duckworth L, Williams E, Wort G, Woods D, Siervo M, O'Hara JP
Publication type: Article
Publication status: Published
Journal: European Journal of Applied Physiology
Print publication date: 01/04/2017
Online publication date: 01/03/2017
Acceptance date: 19/02/2017
Date deposited: 19/05/2017
ISSN (print): 1439-6319
Publisher: Springer Verlag
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