An acute dose of inorganic dietary nitrate does not improve high-intensity, intermittent exercise performance in temperate or hot and humid conditions
Smith K, Muggeridge DJ, Easton C, Ross MD
European journal of applied physiology · 22 citations
How it was studied
- Design
- Randomized controlled trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
- Intake measured by
- Not stated
Who paid for it
- Funding
- Independent funding
Based on full-text disclosure statement.
Publication
- Published
- 2019-01-08 · Eur J Appl Physiol · vol. 119 · issue 3 · pp. 723–733
- Publisher
- Springer Science+Business Media
- Cited
- 30 citations · more than 88% of similar papers · 2.5× the field average
- References
- 58 works
- Access
- Open access (hybrid journal) · CC-BY
- Research areas
- Exercise and Physiological Responses · Cardiovascular and exercise physiology · Thermoregulation and physiological responses
- Keywords
- Dietary Nitrate, Sprint, Medicine, Placebo, Crossover study, Animal science, Nitrate, Internal medicine, Physical therapy, Chemistry, Biology
- MeSH
- humans, nitrates, exercise, cross-over studies, heart rate, running, dietary supplements, adult, male, athletic performance, hot temperature, young adult, fruit and vegetable juices
4 authors
From GB
- Kieran SmithEdinburgh Napier University; Newcastle University
- David Joseph MuggeridgeUniversity of the Highlands and Islands
- Chris EastonUniversity of the West of Scotland
- Mark Ross · correspondingEdinburgh Napier University
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 have yet to be investigated.
Methods
In a randomised, counterbalanced, double-blind crossover study, 12 recreationally trained males ingested a nitrate-rich beetroot juice shot (BRJ) (6.2 mmol NO3-) or a nitrate-depleted placebo (PLA) (3-) 3 h prior to an intermittent sprint test (IST) in temperate (22 °C, 35% RH) and hot conditions (30 °C, 70% RH). The cycle ergometer IST consisted of twenty maximal 6 s sprints interspersed by 114 s of active recovery. Work done, power output, heart rate and RPE were measured throughout; tympanic temperature was measured prior to and upon completion.
Results
There were no significant effects of supplement on sprint performance in either temperate or hot, humid conditions (p > 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 condition. However, ~ 75% of participants experienced performance decreases following BRJ in the hot and humid environment. No differences were observed between trials for tympanic 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.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
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