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Vocal cord adduction while sniffing.

S Mukai1

  • 1Mukai Clinic and Mukai Research Institute of Biology, Kanagawa, Japan.

Archives of Otolaryngology--Head & Neck Surgery
|November 1, 1989
PubMed
Summary
This summary is machine-generated.

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During sniffing, vocal cords adduct, unlike during normal breathing. Nasal airflow rates are also reduced when sniffing compared to regular respiration, impacting inhalation mechanics.

Area of Science:

  • Physiology
  • Respiratory System
  • Laryngeal Function

Background:

  • Understanding laryngeal dynamics during non-speech breathing is crucial.
  • Sniffing involves distinct respiratory and laryngeal actions.
  • Previous research has not fully elucidated vocal cord behavior during sniffing.

Purpose of the Study:

  • To investigate vocal cord movement during sniffing.
  • To compare nasal airflow rates during sniffing versus normal respiration.
  • To differentiate sniffing-related laryngeal adduction from other reflexes.

Main Methods:

  • Fiberscopic observation of vocal cord motion.
  • Electromyography (EMG) to record laryngeal muscle activity.
  • Measurement of nasal airflow rates during sniffing and normal breathing.

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Main Results:

  • Fiberscopy and EMG confirmed vocal cord adduction during sniffing.
  • Olfactory sense was not required for this vocal cord behavior.
  • Sniffing-induced laryngeal adduction is distinct from the defensive laryngeal reflex.
  • Nasal airflow rate during sniffing was lower than during normal respiration.

Conclusions:

  • Vocal cords adduct during the act of sniffing.
  • Sniffing alters nasal airflow dynamics compared to normal respiration.
  • The observed laryngeal adduction during sniffing is a specific mechanism, not a general protective reflex.