Abstract：
To investigate the effects of intentionally minimizing spinal motion and abdominal muscle contractions on intervertebral angles during quadruped upper and lower extremity lift (QULEL). Fifteen healthy men performed the QULEL under four conditions: without any special instructions (basic), with the intention to minimize spinal motion (intentional), with abdominal bracing (bracing), and with abdominal hollowing (hollowing). Each intervertebral angle was calculated from the local coordinate system using the marker data obtained from a motion capture system. Shear moduli, as indicators of the activities of the right transversus abdominis (TrA), internal and external oblique, and rectus abdominis muscles, were assessed using shear wave elastography during QULEL. One-way repeated-measures analysis of variance and multiple comparisons among conditions were used to compare each shear modulus of the abdominal muscle and the changes in thoracic kyphosis (Th1-12), lumbar lordosis (L1-5), and lumbar intervertebral angles from the quadruped position to QULEL. The significance level was set at P < 0.05. Changes in lumbar lordosis and L2/L3 and L3/L4 extension angles were significantly lower under hollowing than under other conditions (effect size ηG2: lumbar lordosis, 0.068; L2/L3, 0.072; L3/L4, 0.043). The change in the L1/L2 extension angle significantly decreased in bracing and hollowing compared with the basic (ηG2 = 0.070). Only the TrA shear modulus significantly increased in bracing and hollowing compared with the basic (ηG2 = 0.146). Abdominal hollowing during the QULEL increased TrA activity and suppressed lumbar extension, except at L4/L5, and may be more effective as a rehabilitation exercise for controlling spinal motion.
摘要：
目的探讨在四足动物上下肢提举(QULEL)过程中,有意地减少脊柱活动和腹肌收缩对椎间角度的影响。15名健康男性在四个条件下进行了QULEL：没有任何特殊说明（基本），旨在最小化脊柱运动（有意），用腹部支撑（支撑），腹部空洞化（空洞化）。使用从运动捕获系统获得的标记数据从局部坐标系计算每个椎间角度。剪切模量,作为右腹横肌(TrA)活动的指标，内部和外部倾斜，和腹直肌,在QULEL期间使用剪切波弹性成像进行评估。使用单向重复测量方差分析和条件之间的多重比较来比较腹部肌肉的每种剪切模量和胸椎后凸（Th1-12）的变化。腰椎前凸(L1-5),从四足位置到QULEL的腰椎角度。显著性水平设定为P<0.05。空心下腰椎前凸和L2/L3和L3/L4延伸角度的变化明显低于其他条件下的变化（效应大小ηG2：腰椎前凸，0.068;L2/L3,0.072;L3/L4,0.043)。与基本（ηG2=0.070）相比，L1/L2延伸角的变化在支撑和挖空方面显着减小。与基本的（ηG2=0.146）相比，只有TrA剪切模量在支撑和挖空方面显着增加。QULEL期间的腹部空洞增加了TrA活动并抑制了腰椎伸展，除了L4/L5，并且可能更有效地作为控制脊柱运动的康复运动。
