The Effect of Dietary Nitrate Supplementation on Physiology and Performance in Trained Cyclists
McQuillan JA, Dulson DK, Laursen PB, Kilding AE
International journal of sports physiology and performance · 12 citations
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
- Independent funding
- University or hospital
- Johns Hopkins University
Based on 1 listed funder(s).
Publication
- Published
- 2016-10-13 · Int J Sports Physiol Perform · vol. 12 · issue 5 · pp. 684–689
- Publisher
- Human Kinetics
- Cited
- 19 citations · more than 92% of similar papers · 3.3× the field average
- Impact
- Top 10% most cited in its field
- References
- 28 works
- Access
- Free to read
- Research areas
- Cardiovascular and exercise physiology · Muscle metabolism and nutrition · Pharmacological Effects and Assays
- Keywords
- Time trial, Placebo, Crossover study, Medicine, Confidence interval, Cycling, Animal science, Endurance training, VO2 max, Physical therapy, Internal medicine, Heart rate, Blood pressure, Biology
- MeSH
- humans, nitrates, cross-over studies, double-blind method, energy metabolism, oxygen consumption, anaerobic threshold, bicycling, dietary supplements, adult, male, athletic performance, physical conditioning, human, fruit and vegetable juices
4 authors
From NZ
- Joseph A. McQuillan · correspondingAuckland University of Technology; University of Waikato
- Deborah K. DulsonAuckland University of Technology
- Paul B. Laursen
- Andrew Edward KildingAuckland University of Technology
Abstract
Purpose
To determine the effect of dietary nitrate (NO3-) supplementation on physiology and performance in well-trained cyclists after 6-8 d of NO3- supplementation.
Methods
Eight competitive male cyclists (mean ± SD age 26 ± 8 y, body mass 76.7 ± 6.9 kg, VO2peak 63 ± 4 mL · kg-1 · min-1) participated in a double-blind, placebo-controlled, crossover-design study in which participants ingested 70 mL of beetroot juice containing ~4 mmol NO3- (NIT) or a NO3--depleted placebo (PLA), each for 8 d. Replicating pretreatment measures, participants undertook an incremental ramp assessment to determine VO2peak and first (VT1) and second (VT2) ventilatory thresholds on d 6 (NIT6 and PLA6), moderate-intensity cycling economy on d 7 (NIT7 and PLA7), and a 4-km time trial (TT) on d 8 (NIT8 and PLA8).
Results
Relative to PLA, 6 d of NIT supplementation produced unclear effects for VO2peak (mean ± 95% confidence limit: 1.8% ± 5.5%) and VT1 (3.7% ± 12.3%) and trivial effects for both VT2 (-1.0% ± 3.0%) and exercise economy on d 7 (-1.0% ± 1.6%). However, effects for TT performance time (-0.7% ± 0.9%) and power (2.4% ± 2.5%) on d 8 were likely beneficial.
Conclusions
Despite mostly unclear outcomes for standard physiological determinants of performance, 8 d of NO3- supplementation resulted in likely beneficial improvements to 4-km TT performance in well-trained male endurance cyclists.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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