class="enumerated" style="list-style-type:decimal">Oral airway resistance (RO) is an important determinant of oro-nasal partitioning of airflow (e.g. during exercise and sleep); however, little is known of factors influencing its magnitude and measurement.We developed a non-invasive standardized technique for measuring RO (based on a modification of posterior rhinomanometry) and examined inspiratory RO in 17 healthy male subjects (age, 36 ± 2 years (mean ±s.e.m.); height, 177 ± 2 cm; weight, 83 ± 3 kg).Inspiratory RO (at 0.4 ls−1) was 0.86 ± 0.23 cmH2O l−1 s−1 during resting mouthpiece breathing in the upright posture. RO was unaffected by assumption of the supine posture, tended to decrease with head and neck extension and increased to 1.22 ± 0.19 cmH2O l−1 s−1 (n = 10 subjects, P < 0.01) with 40–45 deg of head and neck flexion. When breathing via a mouth-mask RO was 2.98 ± 0.42 cmH2O l−1 s−1 (n = 7) and not significantly different from nasal airway resistance.Thus, in awake healthy male subjects with constant jaw position, RO is unaffected by body posture but increases with modest degrees of head and neck flexion. This influence on upper airway patency may be important when oral route breathing is associated with alterations in head and neck position, e.g. during sleep.
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机译：class =“ enumerated” style =“ list-style-type：decimal”> <！-list-behavior =枚举前缀-word = mark-type = decimal max-label-size = 0-> 口腔气道阻力（RO）是决定鼻孔气流分配的重要决定因素（例如，在运动和睡眠期间）；但是，对影响其大小和测量的因素知之甚少。 我们开发了一种非侵入性的标准化RO测量技术（基于后鼻测压法），并检查了17名健康男性受试者的吸气性RO（年龄36±2岁（平均±sem）；身高177±2 cm；体重83±3公斤）。 吸气式反渗透（0.4 ls −1 ）在以直立姿势休息的咬嘴呼吸期间，其值为0.86±0.23 cmH2O l −1 s -1 。 RO不受仰卧姿势的影响，倾向于随着头和颈部的延伸而降低，并增加到1.22±0.19 cmH2O l -1 s -1 （n = 10位受试者） ，P <0.01），头和颈部弯曲40-45度。通过口罩呼吸时，RO为2.98±0.42 cmH2O l -1 s -1 （n = 7），与鼻气道阻力无明显差异。
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