Funded in part by Shaklee Corp.
The effect of six days of dietary nitrate supplementation on performance in trained CrossFit athletes
Kramer SJ, Baur DA, Spicer MT, Vukovich MD, Ormsbee MJ
Journal of the International Society of Sports Nutrition · 46 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
- Intake measured by
- Not stated
Who paid for it
- Funding
- Industry funded
- Company
- Shaklee Corp.
Based on 1 listed funder(s) and full-text disclosure statement.
Publication
- Published
- 2016-01-05 · J Int Soc Sports Nutr · vol. 13 · issue 1 · p. 39
- Publisher
- Springer Science+Business Media
- Cited
- 80 citations · more than 91% of similar papers · 3.0× the field average
- Impact
- Top 10% most cited in its field
- References
- 32 works
- Access
- Open access (journal) · CC-BY
- Research areas
- Nitric Oxide and Endothelin Effects · Exercise and Physiological Responses · Muscle metabolism and nutrition
- Keywords
- Medicine, Athletes, Clinical nutrition, Sports medicine, Physical therapy, Sports nutrition, Internal medicine
- MeSH
- humans, nitrates, potassium compounds, cross-over studies, double-blind method, body composition, physical endurance, exercise tolerance, dietary supplements, adult, male, athletic performance, resistance training, young adult, athletes, sports nutritional physiological phenomena
5 authors
From US, ZA
- Samuel James KramerFlorida State University
- Daniel BaurFlorida State University
- Maria T. SpicerFlorida State University
- Matthew D. VukovichSouth Dakota State University
- Michael J. Ormsbee · correspondingFlorida State University; University of KwaZulu-Natal
Abstract
Background
While it is well established that dietary nitrate reduces the metabolic cost of exercise, recent evidence suggests this effect is maintained 24 h following the final nitrate dose when plasma nitrite levels have returned to baseline. In addition, acute dietary nitrate was recently reported to enhance peak power production. Our purpose was to examine whether chronic dietary nitrate supplementation enhanced peak power 24 h following the final dose and if this impacted performance in a heavily power-dependent sport.
Methods
In a double-blind, randomized, crossover design, maximal aerobic capacity, body composition, strength, maximal power (30 s Wingate), endurance (2 km rowing time trial), and CrossFit performance (Grace protocol) were assessed before and after six days of supplementation with nitrate (NO) (8 mmol·potassium nitrate·d-1) or a non-caloric placebo (PL). A 10-day washout period divided treatment conditions. Paired t-tests were utilized to assess changes over time and to compare changes between treatments.
Results
Peak Wingate power increased significantly over time with NO (889.17 ± 179.69 W to 948.08 ± 186.80 W; p = 0.01) but not PL (898.08 ± 183.24 W to 905.00 ± 157.23 W; p = 0.75). However, CrossFit performance was unchanged, and there were no changes in any other performance parameters.
Conclusion
Consuming dietary nitrate in the potassium nitrate salt form improved peak power during a Wingate test, but did not improve elements of strength or endurance in male CrossFit athletes.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
Community trust
Loading…
How much do you trust this study's findings?
Comments
Sign in to rate, comment on or flag this study.Sign inSomething wrong here?
Flag this study if its information, labels or funding look wrong. An editor reviews every flag.
Sign in to rate, comment on or flag this study.Sign inEducational information about published research. Not medical advice, and not a recommendation to start or stop anything.