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Related Experiment Video

Updated: Jun 12, 2026

Skeletal Muscle Neurovascular Coupling, Oxidative Capacity, and Microvascular Function with 'One Stop Shop' Near-infrared Spectroscopy
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Perfusion heterogeneity does not explain excess muscle oxygen uptake during variable intensity exercise.

Marko S Laaksonen1, Glenn Björklund, Ilkka Heinonen

  • 1Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Ostersund, Sweden. marko.laaksonen@miun.se

Clinical Physiology and Functional Imaging
|May 25, 2010
PubMed
Summary

Skeletal muscle oxygen uptake (VO2) increased during a second high-intensity exercise bout, despite similar oxygen delivery and perfusion. This suggests working muscle cells contribute to the elevated VO2 during intense exercise.

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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice

Published on: March 15, 2019

Area of Science:

  • Exercise Physiology
  • Skeletal Muscle Metabolism
  • Cardiovascular Physiology

Background:

  • Understanding the relationship between oxygen delivery and utilization in skeletal muscle during exercise is crucial for optimizing athletic performance and understanding physiological limitations.
  • Previous research has explored muscle oxygen uptake (VO2) and perfusion, but the specific dynamics during variable-intensity intermittent exercise remain less clear.

Purpose of the Study:

  • To investigate the association between muscle oxygen uptake (VO2) and perfusion, including perfusion heterogeneity, during intermittent isometric one-legged knee-extension exercise at varying intensities.
  • To determine if changes in perfusion heterogeneity can explain discrepancies between oxygen delivery and uptake during different exercise intensities.

Main Methods:

  • Eight healthy males performed intermittent isometric knee-extension exercise at 50% MVC (HI-1), 10% MVC (LOW), and 50% MVC (HI-2) for 6 minutes each.
  • Muscle perfusion and oxygen delivery were measured using positron emission tomography (PET) and arterial-venous (a-v) blood sampling.
  • Muscle VO2 and oxygen extraction were calculated, and perfusion heterogeneity was assessed using relative dispersion (RD).

Main Results:

  • Muscle perfusion and O2 delivery were significantly higher during high-intensity workloads (HI-1, HI-2) compared to low-intensity (LOW).
  • Muscle VO2 was significantly higher during both HI workloads compared to LOW, and notably, 25% higher during HI-2 than HI-1.
  • O2 extraction increased with intensity, and perfusion heterogeneity was lower during HI workloads compared to LOW, with no difference between HI workloads.

Conclusions:

  • Skeletal muscle perfusion and O2 delivery remain consistent between high-intensity exercise bouts of the same intensity.
  • Muscle VO2 increases during a second high-intensity bout, even with unchanged O2 delivery, suggesting contributions from within working muscle cells.
  • Perfusion heterogeneity does not account for the observed increase in muscle VO2 during the second high-intensity exercise period.