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KMID : 1035420190070010019
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Journal of The Korean Society of Integrative Medicine
2019 Volume.7 No. 1 p.19 ~ p.26
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Changes in Onset Time of Lumbar Extensor Muscles and Pelvic Angle during Prone Hip Extension after the Abdominal Draw-in Exercise in Normal Women and Women with Weak Abdominal Muscles
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Kim Dong-Woo
Park Han-Kyu
Han Jin-Won
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Abstract
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Purpose : The aim of this study was to investigate the effects of the abdominal draw-in (ADI) exercise on the onset times of the gluteus maximus (GM) and erector spinae (ES) as well as the pelvic anterior tilt angle during prone hip extension (PHE).
Method : A total of 24 female adults were divided into two groups: those with normal abdominal muscles (n=12) and those with weak abdominal muscles(WAM; n=12). Before the intervention, the onset times of the GM and ES along with the pelvic angle during PHE were measured. Subsequently, the participants conducted the ADI exercise for 10 minutes. After conducting the ADI exercise, the onset times and the pelvic angle were re-measured.
Results : In the pre-intervention comparison between the two groups, the WAM group showed faster ES onset times and higher pelvic angle than the normal group (p<0.05). In the WAM group, the ES onset times were significantly delayed after the ADI exercise (p<0.05). In both groups, the pelvic angle was significantly decreased after the ADI exercise (p<0.05). The decrease in the pelvic angle was significantly greater in the WAM group than in the normal group (p<0.05). The GM onset time was found to be not significant in all comparisons (p>0.05).
Conclusion : Therefore, it can be concluded that after performing the ADI exercise, the pelvic anterior tilt during PHE is decreased in normal women and those with WAM, especially in the WAM group, suggesting that the ADI exercise can reduce the compensatory pelvic anterior tilt more effectively by delaying the ES onset times.
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KEYWORD
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abdominal drawing-in maneuver, onset time, pelvic anterior tilt, weakness of abdominal muscles
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