We used a 3-arm randomized control trial to investigate whether abdominal hollowing (AH) home exercise using pocket-sized ultrasonography (US)—miruco (AH with miruco group)—was more effective than conventional AH home exercise using abdominal palpation and or also a wait-and-see approach (control group) to improve isolated control of the transversus abdominis (TrA) muscle during AH. We randomized 60 participants with low back pain into the three groups equally. Primary outcome measures for the US group were percentage of change in TrA thickness and excursion of the edge of the TrA fascia during AH when the thickness of the internal or external oblique muscles increased. Score on the Oswestry Disability Index (ODI) was a secondary outcome measure. The intervention period was 1 week, followed by 1 week without intervention. As a result, we found no statistically significant interaction effect (P > .05) in changes of the primary outcome measures from baseline for each follow-up period. The AH with miruco group had a statistically lower ODI (P = .036) than did the control group after the intervention. Results indicate a limited benefit for use of the miruco in AH home exercise to improve isolated control of the TrA muscle during AH.

我们进行了一项3臂随机对照试验，以研究使用袖珍大小的超声检查（US）进行的腹部空心（AH）家庭锻炼-miruco（带有miruco组的AH）是否比使用腹部触诊的常规AH家庭锻炼更有效，或者一种观望方法（对照组），以改善AH期间横腹肌（TrA）肌肉的孤立控制。我们将60位腰背痛参与者随机分为三组。美国组的主要结局指标是AH期间内或外斜肌厚度增加时TrA厚度变化和TrA筋膜边缘偏移的百分比。Oswestry残疾指数（ODI）的得分是次要结果指标。干预期为1周，随后为1周，无干预。因此，P  > .05），每个随访期的主要结局指标相对于基线的变化。 干预后，miruco组的AH的ODI值在统计学上低于对照组（P = .036）。结果表明在AH家庭锻炼中使用miruco改善AH期间对TrA肌肉的孤立控制的益处有限。