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Related Experiment Videos

Paranasal sinus ventilation by humming.

Svante Granqvist1, Johan Sundberg, Jon O Lundberg

  • 1Department of Speech Music Hearing, KTH, Stockholm, Sweden.

The Journal of the Acoustical Society of America
|May 20, 2006
PubMed
Summary
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Humming increases nitric oxide (NO) in exhaled air by using acoustic resonance. The study suggests vibrating sinus ostia expel NO gas, which is then carried out by airflow.

Area of Science:

  • Physiology
  • Acoustics
  • Respiratory Medicine

Background:

  • Nitric oxide (NO) is endogenously produced in human paranasal sinuses.
  • NO is measurable in exhaled nasal air.
  • Humming significantly elevates exhaled NO levels.

Purpose of the Study:

  • To analyze the acoustic phenomenon responsible for NO gas evacuation from sinuses during humming.
  • To elucidate the mechanism of increased NO expulsion during humming.

Main Methods:

  • Construction of a physical tube model with a NO-filled syringe attached radially.
  • Excitation of the tube model using a sine wave-modulated airflow.
  • Development of a computer model to simulate system pressure and frequency.
  • Analysis of NO gas evacuation based on syringe position relative to pressure nodes.

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Main Results:

  • Increased NO evacuation was observed when the syringe was not positioned at a pressure node.
  • The computer model accurately matched observed pressure versus frequency data.
  • Acoustic resonance in the sinus resonators appears to be the driving factor.

Conclusions:

  • Alternating pressure in the nasal cavity during humming causes vibration of the air plug in the sinus ostia.
  • This vibration expels NO gas from the paranasal sinuses.
  • The expelled NO is then transported to the ambient air via the exhalatory airflow.