Cited by 227Cardiovascular and exercise physiologyExercise and Physiological ResponsesSports Performance and Training

Sprint interval and endurance training are equally effective in increasing muscle microvascular density and eNOS content in sedentary males

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Cocks, Matthew, Shaw, Christopher S., Shepherd, Sam O., Fisher, James P., Ranasinghe, Aaron M., Barker, Thomas A., Tipton, Kevin D., Wagenmakers, Anton J. M.·2013·The Journal of Physiology

Abstract

Key point Optimal vascular function is critical for health, and endurance training (ET) has previously been shown to be an effective method of improving this. Sprint interval training (SIT) has been proposed as a time efficient alternative to ET but its effect on skeletal muscle microvasculature has not been studied and no direct comparison with ET has been made. ET and SIT in this study were equally effective at decreasing arterial stiffness and increasing skeletal muscle capillarisation and eNOS content. The main results suggest that both training modes improve skeletal muscle microvascular and macrovascular function, with SIT being a time efficient alternative. Abstract Sprint interval training (SIT) has been proposed as a time efficient alternative to endurance training (ET) for increasing skeletal muscle oxidative capacity and improving certain cardiovascular functions. In this study we sought to make the first comparisons of the structural and endothelial enzymatic changes in skeletal muscle microvessels in response to ET and SIT. Sixteen young sedentary males (age 21 ± SEM 0.7 years, BMI 23.8 ± SEM 0.7 kg m−2) were randomly assigned to 6 weeks of ET (40–60 min cycling at ∼65% , 5 times per week) or SIT (4–6 Wingate tests, 3 times per week). Muscle biopsies were taken from the m. vastus lateralis before and following 60 min cycling at 65% to measure muscle microvascular endothelial eNOS content, eNOS serine1177 phosphorylation, NOX2 content and capillarisation using quantitative immunofluorescence microscopy. Whole body insulin sensitivity, arterial stiffness and blood pressure were also assessed. ET and SIT increased skeletal muscle microvascular eNOS content (ET 14%; P < 0.05, SIT 36%; P < 0.05), with a significantly greater increase observed following SIT (P < 0.05). Sixty minutes of moderate intensity exercise increased eNOS ser1177 phosphorylation in all instances (P < 0.05), but basal and post‐exercise eNOS ser1177 phosphorylation was lower following both training modes. All microscopy measures of skeletal muscle capillarisation (P < 0.05) were increased with SIT or ET, while neither endothelial nor sarcolemmal NOX2 was changed. Both training modes reduced aortic stiffness and increased whole body insulin sensitivity (P < 0.05). In conclusion, in sedentary males SIT and ET are effective in improving muscle microvascular density and eNOS protein content.

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Authors
Cocks, M., Shaw, C. S., Shepherd, S. O., Fisher, J. P., Ranasinghe, A. M., Barker, T. A., Tipton, K. D., & Wagenmakers, A. J. M.
Affiliations
  • University of Birmingham (GB)
  • University of Stirling (GB)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2013-01-31
Volume
591
Issue
3
Pages
641-656
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W1915029257
Cited by
226
References
49
Citations by year
2026: 10 · 2025: 15 · 2024: 12 · 2023: 9 · 2022: 14 · 2021: 16 · 2020: 27 · 2019: 24 · 2018: 14 · 2017: 17 · 2016: 20 · 2015: 23 · 2014: 17 · 2013: 7 · 2012: 1
FWCI
37.43
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Liverpool John Moores University (acceptedVersion)
  • Stirling Online Research Repository (University of Stirling) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
sprint interval training, endurance training, skeletal muscle microvasculature, capillarization, endothelial nitric oxide synthase, NOX2, arterial stiffness, insulin sensitivity, blood pressure, sedentary men, vascular function, exercise training comparison, vastus lateralis, oxidative capacity, endothelial function
MeSH terms
NADPH Oxidase 2, Adult, Bicycling, Blood Pressure, Glucose Tolerance Test, Humans, Insulin Resistance, Male, Membrane Glycoproteins, Physical Endurance, Muscle, Skeletal, NADPH Oxidases, Nitric Oxide Synthase Type III, Microvessels, Young Adult, Sedentary Behavior, Vascular Stiffness

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