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Related Concept Videos

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Mechanism of Breathing I: Inspiration01:30

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Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...
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Related Experiment Video

Updated: Jan 28, 2026

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

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Non-contact breath sampling for sensor-based breath analysis.

Pawel Mochalski1, Gregory Shuster, Marcis Leja

  • 1Institute for Breath Research, University of Innsbruck, Rathausplatz 4, A-6850 Dornbirn, Austria. Institute of Chemistry, Jan Kochanowski University, Świętokrzyska 15 G, PL-25406 Kielce, Poland.

Journal of Breath Research
|March 1, 2019
PubMed
Summary

Non-contact breath sampling offers a promising method for medical diagnosis using portable breath analyzers. This technique allows for exhalation from a distance, maintaining no physical contact and achieving reliable measurement reproducibility.

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Area of Science:

  • Medical diagnostics
  • Sensor technology
  • Analytical chemistry

Background:

  • Breath analysis is crucial for non-invasive, real-time medical diagnosis of early-stage diseases.
  • Existing miniaturized breath analyzers require effective breath sampling methods.
  • There is a need for simple, portable analyzers for rapid disease detection.

Purpose of the Study:

  • To propose and evaluate a non-contact breath sampling method for miniaturized breath analyzers.
  • To assess the feasibility of collecting breath samples via exhalation from a distance without physical contact.

Main Methods:

  • Proton transfer reaction mass spectrometry (PTR-MS) was used to analyze breath samples in real-time.
  • Twenty-three volunteers participated, performing various breathing maneuvers (inhalation depth, exhalation manner, mouth opening size, sampling distance).
  • Four sampling scenarios were evaluated: normal/deep breathing combined with small/wide mouth openings at a ~2 cm distance.

Main Results:

  • A sampling distance of approximately 2 cm was identified as optimal, balancing sample dilution and non-contact requirements.
  • All tested scenarios demonstrated comparable measurement reproducibility, with a spread of around 10%.
  • Deep inhalation significantly prolonged the end-tidal phase of exhalation, especially with a smaller mouth opening.

Conclusions:

  • Non-contact breath sampling is a viable and promising alternative to traditional methods for breath analysis.
  • This approach aligns with natural breathing patterns and supports the development of portable diagnostic devices.
  • Further research can optimize non-contact sampling for diverse clinical applications.