The influence of sudden perturbations on trunk muscle activity and intra-abdominal pressure while standing
The influence of sudden perturbations on trunk muscle activity and intra-abdominal pressure while standing
复制标题
站立时突然扰动对躯干肌肉活动和腹内压的影响
DOI：
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发表时间：
1994
影响因子：
2
通讯作者：
A. Thorstensson
中科院分区：
文献类型：
--
作者：
A. Cresswell;L. Oddsson;A. Thorstensson
意外的腹侧和背侧扰动和预期的自我诱导的腹侧扰动通过突然加载绑在躯干上的背心传递到躯干。对6名男性受试者进行了腹内压（IAP）和腹横肌（TrA）、腹内肌（OI）、腹外肌（OE）和腹直肌（RA）的肌内肌电图检测。用表面肌电图记录竖脊肌（ES）活动。使用基于视频的系统记录躯干和头部的移位。意想不到的腹侧负荷产生的活动，在TrA，OI，OE和RA，和IAP增加以及提前从ES的活动。预期的腹侧负荷产生的所有肌肉的预激活和增加的IAP之前的扰动。在意外和自负荷条件下，TrA始终是第一个活跃的肌肉。两个腹侧负载条件下，向前位移的躯干显着减少在自我负载。意外的背侧负荷产生同时激活的TrA，OI，OE，RA和ES。这些结果表明，躯干肌肉的反应，突然预期和意外的腹侧负荷以外的预期立即伸肌扭矩生产通过ES激活。有人建议，增加IAP是一种机制，旨在提高稳定性的躯干通过硬化的整个部分。
Unexpected ventral and dorsal perturbations and expected, self-induced ventral perturbations were delivered to the trunk by suddenly loading a vest strapped to the torso. Six male subjects were measured for intra-abdominal pressure (IAP) and intra-muscular electromyography of the transversus abdominis (TrA), obliquus internus abdominis (OI), obliquus externus abominis (OE) and rectus abdominis (RA) muscles. Erector spinae (ES) activity was recorded using surface electromyography. Displacements of the trunk and head were registered using a video-based system. Unexpected ventral loading produced activity in TrA, OI, OE and RA, and an IAP increase well in advance of activity from ES. Expected ventral loading produced pre-activation of all muscles and an increased IAP prior to the perturbation. The TrA was always the first muscle active in both the unexpected and self-loading conditions. Of the two ventral loading conditions, forward displacement of the trunk was significantly reduced during the self-loading. Unexpected dorsal loading produced coincident activation of TrA, OI, OE, RA and ES. These results indicate a response of the trunk muscles to sudden expected and unexpected ventral loadings other than the anticipated immediate extensor torque production through ES activation. It is suggested that the increase in IAP is a mechanism designed to improve the stability of the trunk through a stiffening of the whole segment.