Ainscough-Potts Anne-Marie, Morrissey Matthew C, Critchley Duncan
Division of Applied Biomedical Research, Guy's, King's and St. Thomas' School of Biomedical Sciences, Guy's Campus, 3.19 Shepherd's House, London SE1 1UL, UK.
Man Ther. 2006 Feb;11(1):54-60. doi: 10.1016/j.math.2005.03.007. Epub 2005 Jul 11.
The purpose of this study was to consider how the deep abdominal muscles responded to alterations in seated stability. The thickness of the right transverse abdominis (TrA) and internal oblique (IO) muscles were measured with ultrasound imaging in 30 healthy human subjects (mean age 27.7, years 22 females) in supine lying, relaxed sitting on a chair with both feet on the ground, relaxed sitting on a gym ball with both feet on the ground and sitting on a gym ball lifting the left foot off the floor. Measurements were taken at the end of both inspiration and expiration. The results showed that muscle thickness expressed as a percentage of the actual muscle thickness in supine lying did not differ between relaxed sitting on a chair and sitting on a gym ball for either muscle (P=0.012-0.054) where Bonferroni corrected P-value for significance=0.002. Raising the foot off the floor produced a significant increase in thickness for TrA and IO, when compared with the other seated postures (P<0.001). It was also found that both muscles were thicker at the end of expiration (P<0.001) which has also been established by other authors. These findings suggest that both deep abdominal muscles respond in the same way to postural changes. It also demonstrates that these muscles are automatically targeted by significantly decreasing the base of support, but in normal subjects sitting on a gym ball is not sufficient to increase their activity.
本研究的目的是探讨腹部深层肌肉对坐姿稳定性改变的反应。通过超声成像测量了30名健康受试者（平均年龄27.7岁，22名女性）在仰卧位、双脚着地放松坐在椅子上、双脚着地放松坐在健身球上以及坐在健身球上抬起左脚离地时右侧腹横肌（TrA）和腹内斜肌（IO）的厚度。在吸气和呼气末进行测量。结果显示，对于这两块肌肉，以仰卧位实际肌肉厚度的百分比表示的肌肉厚度，在双脚着地放松坐在椅子上和坐在健身球上时并无差异（P = 0.012 - 0.054），经Bonferroni校正后的显著性P值 = 0.002。与其他坐姿相比，抬起脚离地时TrA和IO的厚度显著增加（P < 0.001）。还发现，在呼气末这两块肌肉都更厚（P < 0.001），其他作者也证实了这一点。这些发现表明，腹部深层肌肉对姿势变化的反应方式相同。这也表明，通过显著减小支撑面，这些肌肉会自动成为目标，但对于正常受试者来说，坐在健身球上不足以增加它们的活动。
