Martin J G, De Troyer A
Respir Physiol. 1982 Oct;50(1):63-73. doi: 10.1016/0034-5687(82)90007-x.
Abdominal muscle activity was studied in eight normal subjects, while seated and supine, during inspiratory resistive and elastic mechanical loading. Electromyograms of the external oblique and rectus abdominis muscle were recorded using unipolar needle electrodes and changes in antero-posterior dimensions of the abdomen (Vab) were measured using linearized magnetometers. Elastic loading evoked abdominal muscle activity during expiration, especially in the rectus abdominis, in seven seated subjects while resistive loading did so in five. In four runs activity was also detectable throughout inspiration. Abdominal muscle activity was associated with a reduction in Vab throughout the respiratory cycle. When the subjects were supine loads did not evoke abdominal muscle activity. We conclude that abdominal muscle recruitment during inspiratory mechanical loading may facilitate inspiration by increasing diaphragmatic length.
在八名正常受试者坐位和仰卧位时，于吸气性阻力和弹性机械负荷期间对腹部肌肉活动进行了研究。使用单极针电极记录腹外斜肌和腹直肌的肌电图，并使用线性化磁力计测量腹部前后径（Vab）的变化。在七名坐位受试者中，弹性负荷在呼气期间诱发腹部肌肉活动，尤其是腹直肌，而在五名受试者中，阻力负荷诱发了腹部肌肉活动。在四次测试中，整个吸气过程中也可检测到肌肉活动。在整个呼吸周期中，腹部肌肉活动与Vab的减小有关。当受试者仰卧时，负荷不会诱发腹部肌肉活动。我们得出结论，吸气性机械负荷期间腹部肌肉的募集可能通过增加膈肌长度来促进吸气。
