Related Experiment Video
Updated: Aug 7, 2026
14:49
Conducting Respiratory Oscillometry in an Outpatient Setting
Published on: April 8, 2022
Anxiety and respiratory variability
Ilse Van Diest1, Julian F Thayer, Bruno Vandeputte
1Department of Psychology, University of Leuven, B-3000 Leuven, Belgium. Ilse.VanDiest@psy.kuleuven
Physiology & Behavior
|July 25, 2006
Summary
Anxiety is linked to reduced breathing variability, while fear increases end-tidal carbon dioxide (FETCO2) variability. These findings highlight the distinct physiological responses to anxiety and fear, emphasizing the importance of distinguishing between these affects.
Area of Science:
- Psychophysiology
- Respiratory Medicine
- Affective Neuroscience
Background:
- Individual differences in anxiety and fear influence physiological responses.
- Breathing patterns are sensitive indicators of emotional states.
- Understanding these associations can inform therapeutic interventions.
Purpose of the Study:
- To investigate the relationship between trait anxiety and fear and within-subject variability in breathing parameters.
- To explore how anxious and fearful imagery affect respiratory variability.
- To differentiate the physiological signatures of anxiety and fear.
Main Methods:
- Non-intrusive measurement of respiration timing, volume, and end-tidal carbon dioxide (FETCO2).
- Data collected from 98 young women during baseline, anxious imagery, and fearful imagery.
- Analysis of inter- and intra-individual differences in breathing variability.
Main Results:
- Trait anxiety correlated with reduced breathing variability at baseline.
- Anxious imagery led to decreased variability in expiratory time and inspiratory drive.
- Fearful imagery resulted in increased variability of FETCO2 compared to baseline.
Conclusions:
- Healthy physiological systems exhibit variability and flexibility, consistent with anxiety findings.
- Fearful imagery presents paradoxical findings, underscoring the need to distinguish fear from anxiety.
- Distinct physiological patterns emerge for anxiety and fear, suggesting different underlying mechanisms.
More Related Videos
Related Concept Videos
01:30Alterations in Respiration II
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
01:24Factors Affecting Respiration
Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
01:29Assessment of Ventilation II: Respiratory Depth and Rhythm
Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
01:26Respiratory Volumes and Capacities I
Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
01:19Factors Affecting Pulmonary Ventilation
Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
01:28Asthma I: Introduction
Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...