Breslin E H, Garoutte B C, Kohlman-Carrieri V, Celli B R
University of California, San Francisco.
Chest. 1990 Aug;98(2):298-302. doi: 10.1378/chest.98.2.298.
The purpose of this study was to determine the relationship between recruitment of the DI and SM muscles measured as EMG signal amplitudes, the pattern of respiratory muscle recruitment measured with inductive plethysmography, and the intensity of the sensation of dyspnea, measured with 100 mm VAS. Eighteen normal subjects between the ages of 33 and 47 breathed under two conditions: normal controlled breathing and breathing against an inspiratory resistance at 60 percent of their maximal inspiratory pressure (MIP). The PM, RR, duty cycle (TI/TTOT, and VT were held constant. During resistance breathing, VAS dyspnea was increased when EMG-DI decreased; EMG-SM increased in association with the sensation of dyspnea. During inspiratory resistance breathing, dyspnea markedly increased and rib cage and accessory muscle recruitment was the predominant pattern of breathing. These data suggest that dyspnea may be associated with the recruitment of the accessory respiratory muscles rather than the recruitment of the diaphragm.
本研究的目的是确定以肌电图信号幅度衡量的膈肌（DI）和胸锁乳突肌（SM）的募集、用感应体积描记法测量的呼吸肌募集模式以及用100毫米视觉模拟量表（VAS）测量的呼吸困难感觉强度之间的关系。18名年龄在33至47岁之间的正常受试者在两种条件下呼吸：正常控制呼吸和以其最大吸气压（MIP）的60%对抗吸气阻力呼吸。潮气量（VT）、呼吸频率（RR）、占空比（TI/TTOT）保持恒定。在阻力呼吸期间，当膈肌肌电图（EMG-DI）降低时，VAS呼吸困难增加；胸锁乳突肌肌电图（EMG-SM）与呼吸困难感觉相关增加。在吸气阻力呼吸期间，呼吸困难明显增加，胸廓和辅助肌募集是主要的呼吸模式。这些数据表明，呼吸困难可能与辅助呼吸肌的募集而非膈肌的募集有关。
