De Troyer A, Estenne M, Ninane V, Van Gansbeke D, Gorini M
Respiratory Research Unit, Erasme University Hospital, Brussels School of Medicine, Belgium.
J Appl Physiol (1985). 1990 Mar;68(3):1010-6. doi: 10.1152/jappl.1990.68.3.1010.
We used a high-resolution ultrasound to make electrical recordings from the transversus abdominis muscle in humans. The behavior of this muscle was then compared with that of the external oblique and rectus abdominis in six normal subjects in the seated posture. During voluntary efforts such as expiration from functional residual capacity, speaking, expulsive maneuvers, and isovolume "belly-in" maneuvers, the transversus in general contracted together with the external oblique and the rectus abdominis. In contrast, during hyperoxic hypercapnia, all subjects had phasic expiratory activity in the transversus at ventilations between 10 and 18 l/min, well before activity could be recorded from either the external oblique or the rectus abdominis. Similarly, inspiratory elastic loading evoked transversus expiratory activity in all subjects but external oblique activity in only one subject and rectus abdominis activity in only two subjects. We thus conclude that in humans 1) the transversus abdominis is recruited preferentially to the superficial muscle layer of the abdominal wall during breathing and 2) the threshold for abdominal muscle recruitment during expiration is substantially lower than conventionally thought.
我们使用高分辨率超声对人体腹横肌进行电记录。然后，将该肌肉的行为与六名正常受试者坐姿时腹外斜肌和腹直肌的行为进行比较。在诸如从功能残气量呼气、说话、用力动作以及等容“收腹”动作等自主用力过程中，腹横肌通常与腹外斜肌和腹直肌一起收缩。相比之下，在高氧高碳酸血症期间，所有受试者在通气量为10至18升/分钟时腹横肌出现阶段性呼气活动，这远早于腹外斜肌或腹直肌记录到活动。同样，吸气弹性负荷在所有受试者中诱发了腹横肌呼气活动，但仅在一名受试者中诱发了腹外斜肌活动，仅在两名受试者中诱发了腹直肌活动。因此，我们得出结论：在人类中，1）在呼吸过程中，腹横肌比腹壁浅层肌肉更优先被募集；2）呼气时腹肌募集的阈值远低于传统认知。
