Park Sung-Hyun, Song Min-Young, Park Hyeon-Ji, Park Ji-Hyun, Bae Hyun-Young, Lim Da-Som
Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan, Republic of Korea.
Department of Physical Therapy, Dong-Eui Institute of Technology, Republic of Korea.
J Phys Ther Sci. 2014 Dec;26(12):1843-5. doi: 10.1589/jpts.26.1843. Epub 2014 Dec 25.
[Purpose] The purpose of this study was to investigate the effective strength levels of abdominal muscle contraction using the bracing contraction method. [Subjects] The experiment was conducted with 31 healthy male (M=15) and female (F=16) adults attending D University in Busan; all participants had less than obesity level BMI (BMI<30). [Methods] Bracing contraction was performed by the subjects in the hook-lying position at maximum and minimum pressure levels, five times each, using a Pressure Biofeedback Unit (PBU), and the mean measurement value was calculated. The maximum pressure level was set at 100% and the half maximum pressure level was set at 50%. Each subject's left and right abdominal muscle thicknesses were then measured by ultrasound imaging in each state: at rest, 100% contraction, and 50% contraction. [Results] No significant differences were found between the left and right sides of the transversus abdominis (TrA) at rest, 50%, or 100% contraction. The external oblique abdominis (EO) and internal oblique abdominis (IO) showed no significant difference at rest or at the 50% contraction. However, a significant difference was noted at 100% contraction for the EO and IO. [Conclusion] Application of abdominal contraction using bracing can achieve symmetry in the left and right abdominal muscles at less than the maximum contractile strength. The occurrence of asymmetry in the left and right abdominal muscles at the maximum contractile strength suggests that the most suitable contractile strength in this exercise is less than the maximum contractile strength.
[目的] 本研究旨在探讨使用支撑收缩法时腹部肌肉收缩的有效强度水平。[对象] 实验以31名就读于釜山D大学的健康成年男性（M = 15）和女性（F = 16）为对象；所有参与者的BMI均低于肥胖水平（BMI < 30）。[方法] 受试者在仰卧屈膝位使用压力生物反馈装置（PBU），分别在最大和最小压力水平下进行支撑收缩，各进行5次，计算平均测量值。最大压力水平设定为100%，半最大压力水平设定为50%。然后通过超声成像测量每个受试者在静息、100%收缩和50%收缩状态下左右腹直肌的厚度。[结果] 腹横肌（TrA）在静息、50%或100%收缩时左右两侧之间未发现显著差异。腹外斜肌（EO）和腹内斜肌（IO）在静息或50%收缩时未显示出显著差异。然而，在100%收缩时，EO和IO存在显著差异。[结论] 使用支撑法进行腹部收缩，在小于最大收缩强度时可使左右腹部肌肉达到对称。在最大收缩强度时左右腹部肌肉出现不对称，表明该运动中最合适的收缩强度小于最大收缩强度。
