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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
Published on: March 15, 2019
The walking-induced transient hack concept is valid & relies on a transient early-exercise hypoxemia
Antoine Bruneau1, Mathieu Feuilloy, Corinne Dussaussoy
1L'Université Nantes Angers Le Mans, Centre Hospitalier Universitaire d'Angers, Laboratory for Vascular Investigations, Angers, France.
Plos One
|May 10, 2013
Summary
Transcutaneous oximetry can identify walking-induced transient hypoxemia in patients with exercise intolerance. This method is effective even when peak exercise arterial oximetry results appear normal, aiding in diagnosis.
Area of Science:
- Cardiopulmonary Physiology
- Exercise Medicine
- Diagnostic Imaging
Background:
- Decreased arterial oxygen pressure during peak exercise suggests walking-induced hypoxemia.
- Transcutaneous oximetry reveals unique patterns like "walking-induced transient hacks" in some patients with exercise intolerance.
- These patterns involve a minimal oxygen pressure at exercise onset and a post-exercise overshoot.
Purpose of the Study:
- To analyze walking-induced transcutaneous oxygen pressure changes in patients with exercise intolerance.
- To compare observer-independent clustering techniques with traditional cross-correlation methods for classifying these changes.
- To validate findings of transient hypoxemia using direct arterial sampling in a subset of patients.
Main Methods:
- Applied observer-independent clustering to analyze transcutaneous oxygen pressure in 245 patients during walking.
- Compared clustering classifications with established cross-correlation profile types using kappa statistics.
- Conducted direct iterative arterial sampling during treadmill tests in 10 patients exhibiting transcutaneous "hacks".
Main Results:
- Clustering analysis identified 4 distinct classes closely matching 4 empirical models (cross-correlation coefficients 0.93-0.97).
- Kappa statistic indicated strong agreement (0.865) between the two classification approaches.
- Direct arterial sampling confirmed walking-induced transient hypoxemia in patients with transcutaneous "hacks", showing minimal oxygen pressure at exercise onset and a 2-minute recovery overshoot.
Conclusions:
- Transcutaneous oximetry is a valuable tool for detecting walking-induced transient hypoxemia in patients reporting exercise intolerance.
- This non-invasive method can identify hypoxemia when standard peak-exercise arterial oximetry may yield normal results.
- The findings support the use of transcutaneous oximetry for a more comprehensive assessment of exercise-induced respiratory compromise.
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