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 respiratory rate to tidal volume (RR:Vt) slope ratio can identify dysfunctional breathing in patients with exercise intolerance (EI). This method aids in diagnosing altered breathing patterns contributing to EI, particularly in younger individuals.
Area of Science:
- Pulmonary physiology
- Exercise science
- Diagnostic methods
Background:
- Dysfunctional breathing is a known contributor to exercise intolerance (EI).
- Diagnosing dysfunctional breathing can be challenging.
- Cardiopulmonary exercise testing (CPET) is a key tool for assessing exercise limitations.
Purpose of the Study:
- To develop and validate a novel metric, the respiratory rate to tidal volume (RR:Vt) slope ratio, for evaluating ventilatory responses during CPET.
- To determine if this RR:Vt slope ratio can differentiate ventilatory patterns in patients with EI.
- To test the hypothesis that the RR:Vt slope ratio can uncover unique breathing responses among different EI patient groups.
Main Methods:
- Retrospective review of CPET data from 65 patients with EI (January 2017 - July 2024).
- Calculation of the RR:Vt slope ratio from CPET data.
- Comparison of demographics, spirometry, and CPET results between groups with elevated vs. lower RR:Vt ratios, with and without stridor.
Main Results:
- Patients with an elevated RR:Vt ratio (43.0) were younger compared to those with lower ratios (22.6-22.1).
- 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 patients with EI suggests an altered breathing pattern.
- This finding supports the utility of the RR:Vt slope ratio as a potential indicator of dysfunctional breathing.
- The RR:Vt ratio may offer a new diagnostic approach for identifying breathing abnormalities contributing to exercise intolerance.
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