• PNF and Movement
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• 제19권2호
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• pp.215-223
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• 2021

Purpose: This study aimed to compare the contraction ratios of the abdominal muscles and the preferential activation ratios of the transversus abdominis muscle (TrA) during the abdominal drawing-in maneuver (ADIM) in the hook-lying, sitting, and standing positions. Methods: This study included 30 healthy participants. The thicknesses of the TrA, internal oblique muscle (IO), and external oblique muscle (EO) were measured at rest and during the ADIM in the hook-lying, sitting, and standing positions using B-mode ultrasound imaging. The contraction ratios of these muscles and the preferential activation ratios of the TrA were calculated for each position. Results: The contraction ratio of the TrA and preferential activation ratio of the TrA during the ADIM in the hook-lying position were significantly higher than those in the sitting and standing positions (p < 0.05). The contraction ratio of the TrA during the ADIM in the sitting position was significantly higher than that in the standing position (p < 0.05). Conclusion: The hook-lying position tended to facilitate TrA activity better than the sitting position. Furthermore, the sitting position tended to facilitate TrA activity better than the standing position. These findings suggest that the ADIM in the hook-lying position should be implemented before that in the sitting position and that the ADIM in the sitting position should be implemented before that in the standing position.

• 대한정형도수물리치료학회지
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• 제27권3호
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• pp.79-87
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• 2021

Objective: To compare the effects of lumbar dysfunction and balance when office workers with chronic back pain performed the abdominal drawing-in maneuver. Methods: A total of 16 office workers with chronic low back pain were included in this study. The participants were randomly divided into two groups: the general and abdominal drawing-in maneuver groups. The intervention was applied for 6 weeks, 3 times a week, 70 min per day. Participants in the general exercise group(n=8) performed the general physical therapy and lumbar flexibility exercise, whereas those in the abdominal drawing-in maneuver group(n=8) performed the general physical therapy and lumbar stabilization exercise using abdominal drawing-in maneuver(3 times/week for 6 weeks). All tests, were the Korean Oswestry disability index (KODI) and balance ability, were completed pre and post-intervention. Results: Significant improvements in the KODI and balance ability test were observed in the abdominal drawing-in exercise group (p<.05), whereas no significant changes (p>.05) were observed in the general exercise group. Conclusion: This study revealed that abdominal drawing-in maneuver can effectively improve the lumbar dysfunction and balance ability of office workers with chronic back pain.

• PNF and Movement
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• 제21권2호
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• pp.243-253
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• 2023

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.