Heijdra Y F, Dekhuijzen P N, van Herwaarden C L, Folgering H T
Dept of Pulmonary Diseases, University of Nijmegen, Medical Centre Dekkerswald, Groesbeek, The Netherlands.
Eur Respir J. 1993 Apr;6(4):541-6.
Measurements of static maximal inspiratory mouth pressure (PImax) and dynamic sniff mouth pressure (Psniff) are frequently used to assess inspiratory muscle strength. The aim of the present study was to examine, in 42 healthy subjects, the equivalence of PImax and Psniff, the influence of body posture on PImax and Psniff, and the effects of nasal patency and repeated manoeuvres on Psniff. PImax was significantly higher than Psniff, 11.05 +/- 0.42 versus 8.53 +/- 0.31 kPa. Because of the low agreement between PImax and Psniff, the two measurement methods were not interchangeable. The limits of agreement were 2.56 +/- 3.92 kPa. Sitting PImax was 11.05 +/- 0.42 kPa, and supine PImax was 9.36 +/- 0.41 kPa. Sitting and supine Psniff were 8.53 +/- 0.31 kPa and 7.52 +/- 0.33 kPa, respectively. Psniff performed with one nostril open instead of two, was higher: 9.67 +/- 0.32 kPa left and 9.62 +/- 0.32 kPa right versus 8.53 +/- 0.31 kPa when both nostrils were open. After 20-28 sniff manoeuvres, Psniff fell from 8.43 +/- 0.31 kPa to 7.83 +/- 0.30 kPa, suggesting some mechanism of inspiratory muscle fatigue. We conclude that measurement of sitting PImax yields the highest values for inspiratory muscle strength. The two measurement methods, Psniff and PImax, are not interchangeable. Measurement of Psniff is affected by nasal patency.
静态最大吸气口腔压力（PImax）和动态嗅吸口腔压力（Psniff）的测量常用于评估吸气肌力量。本研究的目的是在42名健康受试者中检验PImax和Psniff的等效性、身体姿势对PImax和Psniff的影响，以及鼻腔通畅性和重复操作对Psniff的影响。PImax显著高于Psniff，分别为11.05±0.42与8.53±0.31 kPa。由于PImax和Psniff之间的一致性较低，这两种测量方法不可互换。一致性界限为2.56±3.92 kPa。坐位PImax为11.05±0.42 kPa，仰卧位PImax为9.36±0.41 kPa。坐位和仰卧位的Psniff分别为8.53±0.31 kPa和7.52±0.33 kPa。单鼻孔开放而非双鼻孔开放时进行的Psniff更高：左侧为9.67±0.32 kPa，右侧为9.62±0.32 kPa，而双鼻孔开放时为8.53±0.31 kPa。在进行20 - 28次嗅吸操作后，Psniff从8.43±0.31 kPa降至7.83±0.30 kPa，提示存在吸气肌疲劳的某种机制。我们得出结论，测量坐位PImax可得出吸气肌力量的最高值。Psniff和PImax这两种测量方法不可互换。Psniff的测量受鼻腔通畅性影响。
