Related Experiment Video
Updated: Aug 6, 2026
08:34
Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
Published on: September 16, 2019
Retrospective Study Exploring Changes in Respiratory Rate and Tidal Volume During Exercise Testing in Patients With
William Durbin1, Karla Foster2, Elliot Brown1
1Department of Pediatrics, University of Cincinnati School of Medicine, Cincinnati, OH,USA.
Pediatric Exercise Science
|July 17, 2026
Summary
A novel cardiopulmonary exercise test (CPET) metric, the respiratory rate to tidal volume (RR:Vt) slope ratio, identified dysfunctional breathing in patients with exercise intolerance (EI). This method aids in diagnosing altered breathing patterns contributing to EI.
Area of Science:
- Cardiopulmonary physiology
- Respiratory medicine
- Pediatric exercise science
Background:
- Dysfunctional breathing is a known contributor to exercise intolerance (EI).
- Diagnosing dysfunctional breathing during exercise can be challenging.
- Novel methods are needed to identify altered ventilatory responses in EI.
Purpose of the Study:
- To develop and evaluate a novel metric, the respiratory rate to tidal volume (RR:Vt) slope ratio, derived from cardiopulmonary exercise tests (CPET).
- To determine if the RR:Vt slope ratio can differentiate ventilatory patterns in patients with EI.
- To test the hypothesis that an elevated RR:Vt slope ratio identifies unique breathing responses in EI patients.
Main Methods:
- Retrospective review of CPET data from 65 patients with EI (ages 9-20).
- Comparison of demographics, spirometry, and CPET results based on RR:Vt slope ratio.
- Analysis included patients with elevated RR:Vt, lower RR:Vt with stridor, and lower RR:Vt without stridor.
Main Results:
- Patients with an elevated RR:Vt ratio (43.0) were younger than those with lower ratios (22.6 and 22.1).
- Elevated RR:Vt group showed reduced tidal volume (Vt) and minute ventilation expansion at peak exercise.
- No significant difference in peak oxygen uptake was observed across groups.
Conclusions:
- An elevated RR:Vt slope ratio in CPET is associated with altered breathing patterns in pediatric patients with EI.
- This metric may serve as an indicator of dysfunctional breathing.
- The findings suggest a potential diagnostic tool for identifying specific ventilatory abnormalities in EI.
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