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Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
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Stress-induced respiratory pattern changes in asthma.

Thomas Ritz1, Erica Simon, Ana F Trueba

  • 1Department of Psychology, Southern Methodist University, PO Box 750442, Dallas, TX 75275-0442, USA. tritz@smu.edu

Psychosomatic Medicine
|July 1, 2011
PubMed
Summary
This summary is machine-generated.

Asthma patients exhibit altered breathing patterns during stress, including longer exhalations and unstable tidal volumes. These stress-induced respiratory changes in asthma may contribute to symptom exacerbation and warrant further investigation.

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Published on: May 14, 2012

Area of Science:

  • Respiratory physiology
  • Psychoneuroimmunology
  • Asthma research

Background:

  • Stress and emotions are known to alter respiratory patterns.
  • Previous research on stress and asthma breathing patterns yielded equivocal results.
  • Specific breathing patterns in asthma can negatively impact airways and exacerbate symptoms.

Purpose of the Study:

  • To investigate stress-related changes in respiratory patterns in individuals with asthma.
  • To build upon prior research by examining a wider range of respiratory parameters.
  • To compare breathing patterns during stress between asthma patients and healthy controls.

Main Methods:

  • Respiration was monitored using respiratory inductance plethysmography in 20 asthma patients and 19 healthy controls.
  • Participants underwent resting conditions and an acute psychosocial stressor (free speech and mental arithmetic task).
  • Partial pressure of end-tidal carbon dioxide (PCO2) was measured via capnometry before and after stress.

Main Results:

  • Asthma patients showed higher minute ventilation (9.0 L vs. 6.8 L) but comparable PCO2 levels to controls.
  • During stress, asthma patients exhibited significantly longer inspiration, expiration, and total respiratory cycles.
  • Increased tidal volume instability and a tendency for expiratory lengthening were observed in asthma patients post-stress.

Conclusions:

  • Expiratory lengthening and variable tidal volumes characterize asthma patients during psychosocial stress.
  • These stress-induced respiratory alterations in asthma require further study to understand their functional implications.
  • The association between these breathing pattern changes and asthma symptom exacerbation needs further investigation.