Morrison N J, Fairbarn M S, Pardy R L
University of British Columbia, Pulmonary Research Laboratory, St. Paul's Hospital, Vancouver, Canada.
Chest. 1989 Jul;96(1):85-8. doi: 10.1378/chest.96.1.85.
We tested whether there were differences in measures of respiratory muscle endurance between tests with spontaneously chosen breathing patterns and tests with fixed breathing rates in normal volunteers. Measures of respiratory muscle endurance-maximum load tolerated, mean mouth pressure at maximum load and peak pressure at maximum load were reproducible over three tests with the spontaneously chosen breathing pattern. There was no difference in these measurements between the three tests with fixed breathing frequency. There was no difference in tidal volume, inspiratory time, and the ratio of inspiratory time to total breath duration between the tests in which breathing pattern was spontaneously chosen; there was a difference in these measurements between the tests with a fixed breathing frequency. We conclude that regulation of breathing frequency is unnecessary in the two-minute threshold loading test to obtain reproducible results for measures of respiratory muscle endurance.
我们测试了正常志愿者在采用自发选择的呼吸模式进行测试和采用固定呼吸频率进行测试时，呼吸肌耐力指标是否存在差异。采用自发选择的呼吸模式进行的三次测试中，呼吸肌耐力指标——最大耐受负荷、最大负荷时的平均口腔压力和最大负荷时的峰值压力具有可重复性。采用固定呼吸频率的三次测试中，这些测量值没有差异。在自发选择呼吸模式的测试之间，潮气量、吸气时间以及吸气时间与总呼吸时长的比值没有差异；在采用固定呼吸频率的测试之间，这些测量值存在差异。我们得出结论，在两分钟阈值负荷测试中，为获得呼吸肌耐力指标的可重复结果，无需调节呼吸频率。
