The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Effectiveness of Iliopsoas Self-Stretching on Hip Extension Angle, Gluteus Maximus Activity, and Pelvic Compensations during Prone Hip Extension in Subjects with Iliopsoas Shortness

  • Kim, Ki-Song (Department of Physical Therapy, College of Life and Health Science, Hoseo University) ;
  • Jeon, In-Cheol (Department of Physical Therapy, College of Life and Health Science, Hoseo University)
  • Received : 2018.01.09
  • Accepted : 2018.02.22
  • Published : 2018.02.28
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Abstract

Purpose: This study examined the effectiveness of iliopsoas self-stretching on the hip extension angle, gluteus maximus (GM) activity, and pelvic compensated angle during prone hip extension (PHE) in subjects with iliopsoas shortness. Methods: Twenty-healthy subjects with iliopsoas shortness were recruited. Electromyography (EMG) was used to examine erector spinae (ES), multifidus (MF), GM, and biceps femoris (BF) while performing PHE. An electromagnetic tracking motion analysis device was used to measure the pelvic compensations. The pelvic compensations while performing PHE were considered to be anterior tilting and rotation. A modified Thomas test was used to monitor the hip extension angle before and after iliopsoas self-stretching. A paired t-test was used to investigate the significant difference after iliopsoas self-stretching during PHE. The level of statistical significance was set to ${\alpha}=0.05$. Results: Muscle activity of GM and hip extension angle were significantly greater after iliopsoas self-stretching compared to that before iliopsoas self-stretching during PHE (p<0.05). BF and pelvic rotation angle were significantly lower after iliopsoas self-stretching compared to that before iliopsoas self-stretching during PHE (p<0.05). The muscle activity of ES was not significantly different between PHE before and after iliopsoas self-stretching (p>0.05). Conclusion: Iliopsoas self-stretching can be effective in selectively strengthening the GM muscles with minimized pelvic compensation in subjects with iliopsoas shortness.

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