Pelvic Floor Muscle, Trunk Muscles, and Lower Limb Muscles Co-contraction at the Positions of Increasing Abdominal Pressure in Young Nulliparous Subjects

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  • TAKAHASHI Yui
    Department of Rehabilitation, Aizen Hospital Department of Renal and Genitourinary surgery, Graduate School of Medicine, Hokkaido University
  • KUMAMOTO Tsuneo
    Department of Rehabilitation, Faculty of Health Sciences, Hokkaido Chitose College of Rehabilitation Department of Physical Therapy, School of Health and Social Services, Saitama Prefectural University
  • SEKO Toshiaki
    Department of Rehabilitation, Faculty of Health Sciences, Hokkaido Chitose College of Rehabilitation
  • MIURA Sayo
    Department of Rehabilitation, Hokusei Hospital
  • KUDOU Yumeko
    Sapporo Maruyama Orthopedic Surgery Miyanosawa Orthopedics Clinic
  • MATSUDA Yui
    Shinsapporo Neurosurgical Hospital
  • NAGAI Takahisa
    Ladies Clinic Kitahama
  • KITTA Takeya
    Department of Renal and Genitourinary surgery, Graduate School of Medicine, Hokkaido University
  • OUCHI Mifuka
    Department of Renal and Genitourinary surgery, Graduate School of Medicine, Hokkaido University
  • SHINOHARA Nobuo
    Department of Renal and Genitourinary surgery, Graduate School of Medicine, Hokkaido University

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Other Title
  • 腹圧上昇肢位が若年未経産婦における骨盤底筋と体幹・下肢筋群の共同収縮に与える影響

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<p>Purpose: This study aimed to investigate the co-contraction of the pelvic floor muscle (PFM), trunk muscle, and lower limb muscles at different positions when the abdominal pressure is increased.</p><p>Methods: The subjects were 15 young nulliparous women, mean age 25.5 ± 2.5 years. We measured vaginal pressure at rest and during PFM contraction. Simultaneously, we also measured the rectus abdominis muscle, external oblique muscle, internal oblique muscle (IO), multifidus muscle, gluteus maximus muscle, and hip adductor muscle activities using a surface electromyograph. We compared vaginal pressure for each measurement position (supine, standing, half sitting, and load-lifting) by twoway analysis of variance with the task performed (rest, PFM contraction), using position as a variable factor, and multiple comparison tests. Additionally, we compared the rate of increase in muscle activity during PFM contraction in each position.</p><p>Results: For task factors, vaginal pressure and all tested muscle activity were significantly higher during PFM contraction. For position factors, vaginal pressure and all tested muscle activity showed significantly higher values in the half sitting and load-lifting. The rate of increase in muscle activity of the IO was higher than that of the other muscles in the supine, standing, and the half sitting.</p><p>Conclusion: It was suggested that IO increased the activity as a co-contraction muscle with PFM in the half sitting, supine, and standing in comparison with other muscles.</p>

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