Abstract：
:Symmetric co-contraction of the transversus abdominis (TrA) muscle is beneficial in terms of increasing trunk stability. The aim of this study was to investigate the symmetry of lateral abdominal muscle thickness during static and dynamic conditions. Fifteen male subjects (27.13 ± 5.51 years old) were instructed to sit on a chair and maintain upright posture. Every individual subject wore a jacket harness that could be backwardly attached to a 9-kg weight through a pulley system. An unexpected drop of the weight induced the transition from static to dynamic condition. The thickness of external oblique, internal oblique, and TrA muscles was measured with ultrasonography. Our results revealed more symmetry of TrA thickness during the dynamic condition (21% vs. 13%, p = 0.019) compared with the static. The symmetric muscle thickness of TrA during the dynamic condition is considered a result of more contraction on the non-dominant side. This phenomenon could be a possible strategy of deep abdominal muscles to prevent spinal torsion during sudden trunk perturbation.
journal_name
Gait Posturejournal_title
Gait & postureauthors
Kim Y,Shim JK,Son J,Pyeon HY,Yoon Bdoi
10.1016/j.gaitpost.2012.11.015subject
Has Abstractpub_date
2013-06-01 00:00:00pages
231-5issue
2eissn
0966-6362issn
1879-2219pii
S0966-6362(12)00434-1journal_volume
38pub_type
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