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J Exerc Rehabil. 2014 Apr 30;10(2):100-5. doi: 10.12965/jer.140096. eCollection 2014 Apr.

The preferential contraction ratios of transversus abdominis on the variations of knee angles during abdominal drawing-in maneuver in wall support standing.

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Department of Physical Therapy, Dong-A University Hospital, Busan, Korea.
Department of Physical Therapy, Choonhae College of Health Sciences, Ulsan, Korea.
Department of Physical Therapy, College of Health Medicine, Kaya University, Gimhae, Korea.


The objective of this study was to determine appropriate knee angles for the abdominal drawing-in maneuver (ADIM) through evaluation of changes in contraction ratios of the abdominal muscles and activity of quadriceps muscle in relation to changes in knee angles occurring while the ADIM is performed in the wall support standing (WSS). 20 subjects performed the ADIM at different knee angles (0°, 20°, 40°, 60°) in random order, standing at a point 6 inches away from the wall with the spine maintained in the neutral position. The WSS with knee flexion at 20° showed significantly higher preferential contraction ratio (PCR) of transversus abdominis (TrA) compared to other positions (0°, 40°, 60°). Therefore, performing the ADIM in the WSS with knee flexion at 20° appears to be the most appropriate position for TrA PCR.


Abdominal drawing-in maneuver; Knee angles; Transversus abdominis; Wall support standing

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