Ultrasound Evaluation of Muscle Thickness Changes in the External Oblique,
Internal Oblique,and Transversus Abdominis Muscles Considering the Influence of Posture
and Muscle Contraction |
| |
Authors: | Tomoaki Sugaya Yota Abe Masaaki Sakamoto |
| |
Institution: | 1) Graduate School of Health Sciences, University of Gunma, Japan;2) Department of Rehabilitation, Gunma University Hospital, Japan |
| |
Abstract: | Purpose] The aim of this study was to investigate muscle thickness changes in the
external oblique (EO), internal oblique (IO), and transversus abdominis (TrA) muscles
between the neutral position and trunk rotation, under a state of rest without voluntary
contractions, and isometric contractions to both sides with resistance of 50% of the
maximum trunk rotation strength. Subjects] The subjects of this study were 21 healthy
young men. Methods] Muscle thickness changes in the EO, IO, and TrA in each position and
state were evaluated by ultrasound. The range of motion at maximum trunk rotation and the
maximum strength of trunk rotation were measured using a hand-held dynamometer. Results]
In the neutral position and at 50% trunk rotation to the right side, the thicknesses of
the IO and TrA significantly increased with resistance. In both states, the thicknesses of
the IO and TrA significantly increased at 50% trunk rotation to the right side.
Conclusion] The muscular contractions of the IO and TrA were stronger during ipsilateral
rotation than in the neutral position and with resistance than at rest. Moreover, the
muscular contraction was strongest in the resistive state during ipsilateral rotation.Key words: Trunk rotation, Low back pain, Functional evaluation |
| |
Keywords: | |
|
|