Effects of Nitrate on the Power–Duration Relationship for Severe-Intensity Exercise
Abstract
PURPOSE: The power asymptote (critical power [CP]) and curvature constant (W') of the power-duration relationship dictate the tolerance to severe-intensity exercise. We tested the hypothesis that dietary nitrate supplementation would increase the CP and/or the W' during cycling exercise. METHODS: In a double-blind, randomized, crossover study, nine recreationally active male subjects supplemented their diet with either nitrate-rich concentrated beetroot juice (BR; 2 × 250 mL·d, ∼8.2 mmol·d nitrate) or a nitrate-depleted BR placebo (PL; 2 × 250 mL·d, ∼0.006 mmol·d nitrate). In each condition, the subjects completed four separate severe-intensity exercise bouts to exhaustion at 60% of the difference between the gas exchange threshold and the peak power attained during incremental exercise (60% Δ), 70% Δ, 80% Δ, and 100% peak power, and the results were used to establish CP and W'. RESULTS: Nitrate supplementation improved exercise tolerance during exercise at 60% Δ (BR, 696 ± 120 vs PL, 593 ± 68 s; P < 0.05), 70% Δ (BR, 452 ± 106 vs PL, 390 ± 86 s; P < 0.05), and 80% Δ (BR, 294 ± 50 vs PL, 263 ± 50 s; P < 0.05) but not 100% peak power (BR, 182 ± 37 vs PL, 166 ± 26 s; P = 0.10). Neither CP (BR, 221 ± 27 vs PL, 218 ± 26 W) nor W' (BR, 19.3 ± 4.6 vs PL, 17.8 ± 3 kJ) were significantly altered by BR. CONCLUSION: Dietary nitrate supplementation improved endurance during severe-intensity exercise in recreationally active subjects without significantly increasing either the CP or the W'.
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Several studies concur with the present finding of not showing a significant change in resting systolic or diastolic blood pressure (or both) in young, healthy adults.
“it is important to note that there are several studies that concur with the present finding of not showing a significant change in resting systolic or diastolic BP (or both) in young, healthy adults (e.g. [24], [28], [31], [37]).”
From Nitrate-responsive oral microbiome modulates nitric oxide homeostasis and blood pressure in humans (2018) · cites this paper as [24]
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Self-citation
- Authors
- KELLY, J., VANHATALO, A., WILKERSON, D. P., WYLIE, L. J., & JONES, A. M.
- Affiliations
- University of Exeter (GB)
- Venue
- Medicine & Science in Sports & Exercise
- Published
- 2013-09
- Volume
- 45
- Issue
- 9
- Pages
- 1798-1806
- ISSN
- 0195-9131 (ISSN-L)
- OpenAlex
- W2121835945
- Cited by
- 87
- References
- 13
- Citations by year
- 2026: 3 · 2024: 2 · 2023: 3 · 2022: 8 · 2021: 6 · 2020: 13 · 2019: 5 · 2018: 12 · 2017: 7 · 2016: 9 · 2015: 7 · 2014: 9 · 2013: 3
- FWCI
- 22.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Medicine & Science in Sports & Exercise (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Keywords
- nitrate supplementation, beetroot juice, critical power, curvature constant, power-duration relationship, severe-intensity exercise, exercise tolerance, cycling exercise, endurance, recreational athletes
- MeSH terms
- Adult, Bicycling, Double-Blind Method, Physical Exertion, Humans, Male, Nitrates, Physical Endurance, Plant Extracts, Exercise Tolerance, Plant Roots, Cross-Over Studies, Dietary Supplements, Beta vulgaris, Young Adult
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