Stocks J, Godfrey S
Respir Physiol. 1978 Aug;34(2):233-46. doi: 10.1016/0034-5687(78)90031-2.
Nasal Resistance (Rn) was measured in 30 Caucasian and 13 Negro infants during the 1st year of life, using an adaptation of the posterior rhinomanometric method. Concurrent measurements of Thoracic Gas Volume (TGV) and Airway Resistance during nose breathing (Raw (n) were made using the plethysmographic technique. The percentage contribution of Rn to Raw (n) was significantly higher in the Caucasian infants (mean 49.2 +/- 7.5 (SD)%), than in the Negro infants (mean 31.1 +/- 6.8 (SD)%), which probably resulted from anatomical differences in nasal structure. In each infant, Rn was subtracted from Raw (n) in order to assess resistance, and its reciprocal, conductance (Gaw), during mouth breathing. A strong linear relationship was found to exist between Gaw (m) and TGV throughout the first year of life (r = 0.92), with no significant difference between Negro and Caucasian infants. Specific Airway Conductance during mouth breathing (SGaw (m) = Gaw (m)/TGV) was found to be considerably higher during infancy than at any other time during life, which may help to at least partially compensate for the fact that newborn infants are obligatory nose breathers.
采用改良的后鼻阻力测量法，对30名白人婴儿和13名黑人婴儿在出生后第一年进行了鼻阻力（Rn）测量。同时，使用体积描记技术测量了胸气量（TGV）和鼻呼吸时的气道阻力（Raw(n)）。白人婴儿中Rn对Raw(n)的贡献率（平均49.2±7.5（标准差）%）显著高于黑人婴儿（平均31.1±6.8（标准差）%），这可能是由于鼻结构的解剖差异所致。为了评估每个婴儿口呼吸时的阻力及其倒数传导率（Gaw），从Raw(n)中减去Rn。在生命的第一年，Gaw(m)与TGV之间存在很强的线性关系（r = 0.92），黑人和白人婴儿之间无显著差异。发现口呼吸时的比气道传导率（SGaw(m)=Gaw(m)/TGV）在婴儿期比生命中的其他任何时候都要高得多，这可能至少有助于部分弥补新生儿必须经鼻呼吸这一事实。
