Document Detail


Influence of nasal airflow temperature and pressure on alae nasi electrical activity.
MedLine Citation:
PMID:  1778924     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of nasal airflow, temperature, and pressure on upper airway muscle electromyogram (EMG) was studied during steady-state exercise in five normal subjects. Alae nasi (AN) and genioglossus EMG activity was recorded together with nasal and oral airflows and pressures measured simultaneously by use of a partitioned face mask. At constant ventilations between 30 and 50 l/min, peak inspiratory AN activity during nasal breathing (7.2 +/- 1.4 arbitrary units) was greater than that during oral breathing (1.0 +/- 0.3 arbitrary units; P less than 0.005). In addition, the onset of AN EMG activity preceded inspiratory flow by 0.38 +/- 0.03 s during nasal breathing but by only 0.17 +/- 0.04 s during oral breathing (P less than 0.04). When the subject changed from nasal to oral breathing, both these differences were apparent on the first breath. However, peak AN activity during nasal breathing was uninfluenced by inspiration of hot saturated air (greater than 40 degrees C), by external inspiratory nasal resistance, or by changes in the expiratory route. The genioglossus activity did not differ between nasal and oral breathing (n = 2). Our findings do not support reflex control of AN activity sensitive to nasal flow, temperature, or surface pressure. We propose a centrally controlled feedforward modulation of phasic inspiratory AN activity linked with the tonic drive to the muscles determining upper airway breathing route.
Authors:
J R Wheatley; T C Amis; L A Engel
Related Documents :
6547124 - Respiratory effects of progressive asphyxia in rabbit pups and adult rabbits.
22572484 - Prevalence of hypertension in nepalese community triples in 25 years: a repeat cross-se...
23017184 - Changes in intraocular pressure after pharmacologic pupil dilation.
16476654 - Changes in peak expiratory flow and respiratory strength during the menstrual cycle.
15612244 - Study of visceral hypersensitivity in irritable bowel syndrome.
939384 - Lower esophageal sphincter function in children with and without gastroesophageal reflux.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  71     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1991 Dec 
Date Detail:
Created Date:  1992-03-12     Completed Date:  1992-03-12     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2283-91     Citation Subset:  IM; S    
Affiliation:
Thoracic Medicine Unit, Westmead Hospital, Sydney, New South Wales, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Electromyography
Humans
Male
Models, Biological
Mouth
Nose / physiology*
Pressure
Respiratory Mechanics / physiology
Respiratory Muscles / physiology*
Temperature

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Role of caudal ventrolateral medulla in reflex and central control of airway caliber.
Next Document:  Performance and metabolic responses to a high caffeine dose during prolonged exercise.