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Related Experiment Video

Updated: May 24, 2026

Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns

Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns

Published on: September 16, 2019

Changes in breathing pattern and thoracoabdominal motion after bariatric surgery: a longitudinal study.

Clarissa M P Matos¹, Karoline S Moraes, Danielle C França

¹Rehabilitation Science Graduation Program, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.

Respiratory Physiology & Neurobiology

|March 15, 2012

Summary

Bariatric surgery significantly alters obese patients' breathing patterns, reducing tidal volume and minute ventilation. Post-surgery, their breathing becomes more similar to healthy individuals, improving respiratory function.

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Area of Science:

Pulmonary Physiology
Bariatric Surgery Outcomes
Respiratory Mechanics

Background:

Obesity is associated with altered breathing patterns and potential respiratory complications.
Bariatric surgery aims to improve obesity-related comorbidities, but its specific effects on respiratory mechanics are not fully understood.

Purpose of the Study:

To evaluate changes in the breathing pattern of obese patients before and after bariatric surgery.
To compare the breathing patterns of obese patients with healthy controls.

Main Methods:

Utilized calibrated respiratory inductive plethysmography to measure breathing parameters.
Assessed 30 obese patients pre- and post-bariatric surgery (6 months) and compared them to 30 control individuals.

Main Results:

Obese patients showed reduced tidal volume (V(T)), minute ventilation (V(E)), and inspiratory duty cycle (T(I)/T(TOT)) after surgery.
Control group exhibited higher breathing frequency, V(E), and phase angle (PhAng).
No significant differences were found in V(T)/T(I), rib cage motion (%RC), or abdominal motion (%AB) between groups or conditions.

Conclusions:

Bariatric surgery induces significant changes in the breathing pattern and respiratory asynchrony in obese patients.
Post-surgical breathing patterns in obese patients become more similar to those of healthy controls.
Respiratory function improvements after bariatric surgery warrant further investigation.