Effect of Physical Therapy on Muscle Synergy Structure During Standing-Up Motion of Hemiplegic Patients

Hiroki Kogami1, Qi An, Ningjia Yang1, Hiroshi Yamakawa1, Yusuke Tamura1, Atsushi Yamashita1, Hajime Asama1, Shingo Shimoda2, Hiroshi Yamasaki3, Matti Itkonen4, Fady Sk Alnajjar, Noriaki Hattori5, Makoto Kinomoto5, Kouji Takahashi5, Takanori Fujii5, Hironori Otomune6, Ichiro Miyai5

  • 1The University of Tokyo
  • 2RIKEN
  • 3Brain Science Institute (BSI) BSI-Toyota Collaboration Center (B
  • 4Brain Science Institute (BSI), RIKEN
  • 5Morinomiya Hospital
  • 6takanorifujii19@yahoo.co.jp

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Category

Interactive Session

Sessions

10:30 - 13:00 | Tue 22 May | podK | TuA@K

HRI 1

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Abstract

Stroke patients suffer from declined physical ability, and it is important to analyze rehabilitation intervention and clarify its effect. In this study, the effect of intervention on the standing-up motion of stroke patients is investigated. First, the intervention timing of a physical therapist (PT) is analyzed quantitatively from the muscle activity of upper limbs during therapy. Next, the intervention effect is evaluated based on body kinematics and muscle synergy. In this study, standing-up motion of hemiplegic patients (n = 12) is measured with and without the intervention by a PT. The results show that PTs teach hemiplegic patients the timing of lifting their buttocks during standing-up motion. Furthermore, it has been found that this intervention could improve the standing-up motion, although stroke patients had inadequate muscle synergy structure. In particular, some patients had delayed activation of the synergy and they could only stood up after they moved their center of mass on their feet. However, the intervention by PTs could induce earlier activation of the synergy. Moreover, the intervention could properly shorten the activation duration of muscle synergy for those who had unusually inappropriate longer activation of synergy. These results imply that disordered and inadequate muscle synergy structure can be improved by proper intervention, and this study contributes to the further development of new rehabilitation methodologies.

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Summary

Physical therapist intervenes knee and hip at the time of hip rise

  • Analyzed intervention of physical therapist to sit-to-stand motion of stroke patients
  • Physical therapy improves muscle synergy of patient sit-to-stand motion: change activation timing earlier, shorten activation duration properly