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Related Experiment Videos

Graphometric analysis of cough tachogram.

S A Kelemen1, T Cséri, I Marozsán

  • 1Department of Respiratory Pathology, János-Hospital, Budapest, Hungary.

Acta Physiologica Hungarica
|January 1, 1987
PubMed
Summary
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Cough airflow is not steady, with 5 distinct phases. The intermediary deceleration phase allows for voluntary cough elongation, impacting peak flow over time.

Area of Science:

  • Respiratory physiology
  • Pulmonary function testing

Background:

  • Cough is a complex physiological reflex.
  • Understanding cough dynamics is crucial for respiratory health assessment.

Purpose of the Study:

  • To analyze the distinct phases of a cough using tachography.
  • To investigate the variability and potential for voluntary control in cough mechanics.

Main Methods:

  • Utilized tachography to record and analyze airflow patterns during coughing.
  • Differentiated cough into five distinct phases: acceleration, initial deceleration, intermediary deceleration, terminal deceleration, and flow-pause.
  • Examined peak flow changes in sequential coughs.

Main Results:

  • Cough airflow is characterized by non-continuous and non-steady patterns.

Related Experiment Videos

  • Airflow occurs only during the acceleration and intermediary deceleration phases.
  • Peak expiratory flow decreases in successive coughs, following an isosceles hyperbola pattern.
  • The intermediary deceleration phase exhibits significant variability, enabling voluntary cough elongation.

    • Conclusions:

    • Cough dynamics are complex, involving distinct, measurable phases.
    • Voluntary control over cough duration is possible, primarily through modulation of the intermediary deceleration phase.
    • The observed decrease in peak flow suggests physiological changes or fatigue during sustained coughing.