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.

doi:10.1007/s00421-018-04063-9

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.

Authors

Kieran Smith

Dr David Muggeridge D.Muggeridge@napier.ac.uk
Lecturer

Chris Easton

Mark D. Ross

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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