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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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End-exercise ΔHHb/ΔVO2 and post-exercise local oxygen availability in relation to exercise intensity.

F Stöcker1, C Von Oldershausen1, F K Paternoster2

  • 1Center for Teaching and Learning, Technische Universität München, München, Germany.

Clinical Physiology and Functional Imaging
|November 19, 2015
PubMed
Summary
This summary is machine-generated.

High-intensity interval training improves oxygen availability in muscles. Exercise intensity above 60% peak oxygen uptake (VO2peak) enhances muscle oxygenation, with intensities at or above 80% VO2peak yielding the greatest post-exercise oxygen availability.

Keywords:
exercise intensityhyperaemiamuscle oxygenationnear-infrared spectroscopypost-exercise muscle perfusionprior exercise

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Muscle Metabolism

Background:

  • Interval training is linked to oxidative adaptations, potentially via increased local blood supply.
  • The precise relationship between exercise intensity, local blood flow, and oxygen availability requires further investigation.

Purpose of the Study:

  • To investigate the impact of varying exercise intensities (40-90% VO2peak) on muscle oxygenation.
  • To evaluate the ratio of deoxygenated hemoglobin to oxygen uptake (ΔHHb/ΔVO2) as an indicator of microvascular oxygen distribution.

Main Methods:

  • Seventeen male subjects completed 3-minute cycling bouts at six randomized intensities (40-90% VO2peak) with 5-minute rests.
  • Near-infrared spectroscopy monitored oxygenated (ΔO2Hb), deoxygenated (ΔHHb), and total hemoglobin (ΔTHb) in the vastus lateralis.
  • Oxygen uptake (VO2) was measured concurrently.

Main Results:

  • The ΔHHb/ΔVO2 ratio increased up to 60% VO2peak and decreased from 60% to 90% VO2peak, indicating a shift in oxygen distribution.
  • Post-exercise ΔTHb and ΔO2Hb showed an overshoot, significantly increasing above 60% VO2peak and plateauing at intensities ≥80% VO2peak.
  • Exercise intensities of ≥80% VO2peak resulted in the highest local post-exercise oxygen availability.

Conclusions:

  • Exercise intensities up to 60% VO2peak reveal a growing mismatch between oxygen delivery and utilization in the muscle.
  • Higher exercise intensities (above 60% VO2peak) progressively improve local oxygen distribution and post-exercise oxygen availability.
  • Enhanced vasodilation, possibly driven by lactate production and acidosis, likely mediates improved microvascular perfusion at higher intensities.