PNF and Movement 2023; 21(2): 243-253
Effects of Abdominal Drawing-in Maneuver With Light Load at Sitting on Transverse Abdominis Contraction in Participants With and Without Low Back Pain
Jong-Im Won, P.T., Ph.D.
Department of Physical Therapy, College of Medical Science, Jeonju University
Correspondence to: Jong-Im Won (
Received: June 29, 2023; Revised: July 20, 2023; Accepted: July 26, 2023; Published online: August 31, 2023.
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Purpose: This study aimed to investigate the effects of an abdominal drawing-in maneuver (ADIM) with a light load while sitting on transverse abdominis contraction in subjects with and without low back pain.
Methods: In this study, 20 participants with chronic low back pain and 20 controls participated. Ultrasonography was used to assess the thickness of the external oblique (EO), internal oblique (IO), and transversus abdominis (TrA) muscles. Muscle thickness was measured at rest and during ADIM in three different sitting postures: (1) just sitting, (2) sitting loaded position (holding a 1 or 2 kg dumbbell in each hand), and (3) sitting loaded shoulder flexion position (holding a 1 or 2 kg dumbbell in each hand).
Results: The contraction ratio (CR) and preferential activation ratio (PAR) of the TrA during ADIM had no significant interactional effect between the group and the sitting postures. However, the CR and PRA of the TrA during the ADIM showed significant differences among the three different sitting postures. The CR of the TrA during the ADIM in the sitting loaded shoulder flexion position was significantly increased compared to that in the sitting position (p˂0.05). Moreover, the PRA of the TrA muscle during ADIM in sitting loaded and sitting loaded shoulder flexion positions was significantly higher than that in the sitting position (p˂0.05).
Conclusion: The findings suggest that ADIM in the sitting-loaded shoulder flexion position should be implemented to facilitate TrA activity.
Keywords: Abdominal drawing-in maneuver, Preferential activation ratio, Sitting loaded shoulder flexion position, Transverse abdominal

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