Microvascular oxygen pressures in muscles comprised of different fiber types: Impact of dietary nitrate supplementation
Open accessAbstract
Nitrate (NO3(-)) supplementation via beetroot juice (BR) preferentially improves vascular conductance and O2 delivery to contracting skeletal muscles comprised predominantly of type IIb + d/x (i.e. highly glycolytic) fibers following its reduction to nitrite and nitric oxide (NO). To address the mechanistic basis for NO3(-) to improve metabolic control we tested the hypothesis that BR supplementation would elevate microvascular PO2 (PO2mv) in fast twitch but not slow twitch muscle. Twelve young adult male Sprague-Dawley rats were administered BR ([NO3(-)] 1 mmol/kg/day, n = 6) or water (control, n = 6) for 5 days. PO2mv (phosphorescence quenching) was measured at rest and during 180 s of electrically-induced 1-Hz twitch contractions (6-8 V) of the soleus (9% type IIb +d/x) and mixed portion of the gastrocnemius (MG, 91% type IIb + d/x) muscles. In the MG, but not the soleus, BR elevated contracting steady state PO2mv by ~43% (control: 14 ± 1, BR: 19 ± 2 mmHg (P < 0.05)). This higher PO2mv represents a greater blood-myocyte O2 driving force during muscle contractions thus providing a potential mechanism by which NO3(-) supplementation via BR improves metabolic control in fast twitch muscle. Recruitment of higher order type II muscle fibers is thought to play a role in the development of the VO2 slow component which is inextricably linked to the fatigue process. These data therefore provide a putative mechanism for the BR-induced improvements in high-intensity exercise performance seen in humans.
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Dietary nitrate may specifically enhance the physiological responses of type II, and not type I, muscle fibers to exercise.
“Given that dietary NO 3 -may specifically enhance the physiological responses of type II, and not type I, muscle fibers to exercise (42,43,53,64)”
From Dietary Nitrate and Physical Performance (2018) · cites this paper as [43]
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- Authors
- Ferguson, S. K., Holdsworth, C. T., Wright, J. L., Fees, A. J., Allen, J. D., Jones, A. M., Musch, T. I., & Poole, D. C.
- Affiliations
- Kansas State University (US)
- Duke University (US)
- University of Exeter (GB)
- Corresponding author
- Poole, David C.
- ORCID
- Venue
- Nitric Oxide
- Publisher
- Elsevier BV
- Published
- 2015-08
- Volume
- 48
- Pages
- 38-43
- ISSN
- 1089-8603 (ISSN-L)
- PMC
- PMC4383717
- OpenAlex
- W2071356846
- Cited by
- 120
- References
- 61
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 9 · 2023: 5 · 2022: 11 · 2021: 11 · 2020: 16 · 2019: 11 · 2018: 12 · 2017: 15 · 2016: 9 · 2015: 11
- FWCI
- 25.16
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Nitric Oxide (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Kansas State University
- American Heart Association Midwest Affiliate (10GRNT4350011)
- NIH (HL-108328)
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
- Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
- Keywords
- nitrate supplementation, beetroot juice, skeletal muscle fiber types, fast-twitch muscle, slow-twitch muscle, soleus muscle, gastrocnemius, nitrite, muscle contraction, VO2 slow component, exercise fatigue, high-intensity exercise performance
- MeSH terms
- Animals, Male, Muscle Contraction, Nitrates, Oxygen, Rats, Sprague-Dawley, Muscle, Skeletal, Muscle Fibers, Fast-Twitch, Muscle Fibers, Slow-Twitch, Dietary Supplements
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