{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T21:06:45Z","timestamp":1790024805234,"version":"4.0.1"},"reference-count":37,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2006,7,21]],"date-time":"2006-07-21T00:00:00Z","timestamp":1153440000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2006,8]]},"abstract":"<jats:p>We have recently demonstrated that the severity of sleep\u2010disordered breathing in obstructive sleep apnoea hypopnoea syndrome (OSAHS) can be reduced by lowering the surface tension (\u03b3) of the upper airway lining liquid (UAL). Morning xerostomia (related to oral breathing during sleep) is reported by most OSAHS patients. In the present study we examine relationships between breathing route, oral mucosal \u2018wetness\u2019 and the \u03b3 of UAL. We studied eight healthy subjects (age, 25 \u00b1 5 years [mean \u00b1<jats:sc>s.d.<\/jats:sc>]; body\u2010mass index, 23 \u00b1 2 kg m<jats:sup>\u22122<\/jats:sup>) during a 120 min challenge of both nasal\u2010only breathing (mouth taped) and oral\u2010only breathing (nose clip), each on a separate day (randomized). Both oral mucosal \u2018wetness\u2019 (5 s contact gravimetric absorbent paper strip method) and the \u03b3 (\u2018pull\u2010off\u2019 force technique) of 0.2 \u03bcl samples of UAL obtained from the posterior pharyngeal wall were measured at 15 min intervals (mouth tape removed and replaced as required). Upper airway mucosal \u2018wetness\u2019 increased during 120 min of nasal breathing from 4.0 \u00b1 0.4 (mean \u00b1<jats:sc>s.e.m.<\/jats:sc>) to 5.3 \u00b1 0.3 \u03bcl (5 s)<jats:sup>\u22121<\/jats:sup> but decreased from 4.5 \u00b1 0.4 to 0.1 \u00b1 0.2 \u03bcl (5 s)<jats:sup>\u22121<\/jats:sup> with oral breathing (both <jats:italic>P<\/jats:italic> &lt; 0.001, repeated\u2010measures ANOVA, Tukey's multiple comparison test, <jats:italic>post hoc<\/jats:italic> test). Concurrently, the \u03b3 of UAL decreased from 59.3 \u00b1 2.2 to 51.8 \u00b1 0.98 mN m<jats:sup>\u22121<\/jats:sup> with nasal breathing but increased from 64.4 \u00b1 2.7 to 77.4 \u00b1 1.1 mN m<jats:sup>\u22121<\/jats:sup> with oral breathing (<jats:italic>P<\/jats:italic> &lt; 0.001). For the group and all conditions studied, \u03b3 of UAL values strongly correlated with upper airway mucosal \u2018wetness\u2019 (correlation coefficient, <jats:italic>r<\/jats:italic><jats:sup>2<\/jats:sup>=\u22120.34, <jats:italic>P<\/jats:italic> &lt; 0.001; linear regression). We conclude that oral breathing increases and nasal breathing decreases the \u03b3 of UAL in healthy subjects during wakefulness. We speculate that nasal breathing in OSAHS patients during sleep may promote a low \u03b3 of UAL that may contribute to reducing the severity of sleep\u2010disordered breathing.<\/jats:p>","DOI":"10.1113\/jphysiol.2005.102129","type":"journal-article","created":{"date-parts":[[2006,5,12]],"date-time":"2006-05-12T07:50:59Z","timestamp":1147420259000},"page":"859-866","source":"Crossref","is-referenced-by-count":34,"title":["Influence of breathing route on upper airway lining liquid surface tension in humans"],"prefix":"10.1113","volume":"574","author":[{"given":"Manisha","family":"Verma","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret","family":"Seto\u2010Poon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John R.","family":"Wheatley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Terence 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