Kieran Smith
An acute dose of inorganic dietary nitrate does not improve high-intensity, intermittent exercise performance in temperate or hot and humid conditions
Smith, Kieran; Muggeridge, David J.; Easton, Chris; Ross, Mark D.
Abstract
Purpose: Dietary nitrate (NO3-) has repeatedly been shown to improve endurance and intermittent, high-intensity events in temperate conditions. However, the ergogenic effects of dietary NO3- on intermittent exercise performance in hot conditions has yet to be investigated.
Methods: In a randomised, counterbalanced, double-blind crossover study, twelve 5recreationally trained males ingested a nitrate-rich beetroot juice shot (BRJ) (6.2 mmol NO3-) or a nitrate-depleted placebo (PLA) (0.05). There was a reduced peak (BRJ: 659±100W vs. PLA: 693±139W; p=0.056) and mean power (BRJ: 543±29W vs PLA: 575±38W; p=0.081) following BRJ compared to PLA in the hot and humid condition, but this was not statistically significant. There was no effect of supplement on total work done irrespective of environmental 69 condition. However, ~75% of participants experienced performance decreases following BRJ 70 in the hot and humid environment. No differences were observed between trials for tympanic 71 temperature measured at the conclusion of the exercise trial.
Conclusion: In conclusion, an acute dose of inorganic dietary NO3- does not improve repeated sprint performance in either temperate, or hot and humid conditions.
Citation
Smith, K., Muggeridge, D. J., Easton, C., & Ross, M. D. (2019). An acute dose of inorganic dietary nitrate does not improve high-intensity, intermittent exercise performance in temperate or hot and humid conditions. European Journal of Applied Physiology, 119(3), 723-733. https://doi.org/10.1007/s00421-018-04063-9
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 21, 2018 |
Online Publication Date | Jan 8, 2019 |
Publication Date | 2019-03 |
Deposit Date | Jan 3, 2019 |
Publicly Available Date | Jan 8, 2019 |
Journal | European Journal of Applied Physiology |
Print ISSN | 1439-6319 |
Electronic ISSN | 1439-6327 |
Publisher | Springer |
Peer Reviewed | Peer Reviewed |
Volume | 119 |
Issue | 3 |
Pages | 723-733 |
DOI | https://doi.org/10.1007/s00421-018-04063-9 |
Keywords | Nitrate; exercise; heat; high-intensity; beetroot juice; heat; humidity |
Public URL | http://researchrepository.napier.ac.uk/Output/1479451 |
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An acute dose of inorganic dietary nitrate does not improve high-intensity, intermittent exercise performance in temperate or hot and humid conditions
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© The Author(s) 2019
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This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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