Cited by 120Cardiovascular and exercise physiologyNitric Oxide and Endothelin EffectsExercise and Physiological Responses

Microvascular oxygen pressures in muscles comprised of different fiber types: Impact of dietary nitrate supplementation

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Ferguson, Scott K., Holdsworth, Clark T., Wright, Jennifer L., Fees, Alex J., Allen, Jason D., Jones, Andrew M., Musch, Timothy I., Poole, David C.·2015·Nitric Oxide

Abstract

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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Crossref · 10.1016/j.niox.2014.09.157

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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.
Venue
Nitric Oxide
Publisher
Elsevier BV
Published
2015-08
Volume
48
Pages
38-43
ISSN
1089-8603 (ISSN-L)
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
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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