Publications by authors named "Sayuri Osako"

2 Publications

  • Page 1 of 1

Number of Synergies Is Dependent on Spasticity and Gait Kinetics in Children With Cerebral Palsy.

Pediatr Phys Ther 2018 01;30(1):34-38

Department of Physical Therapy (Mr Hashiguchi), Faculty of Health Science, Gunma Paz University, Gunma, Japan; Department of Physical Therapy (Drs Ohata and Yamada), Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Kuretake Special Support School and Kita Special Support School (Ms Osako), Kyoto, Japan; Kansai Rehabilitation Hospital (Dr Kitatani), Osaka, Japan; Aijinkai Rehabilitation Hospital (Ms Aga), Osaka, Japan; Department of Physical Therapy (Dr Masaki), Niigata University of Health and Welfare, Niigata, Japan.

Purpose: Children with cerebral palsy have motor dysfunctions, which are mainly associated with the loss of motor coordination. For the assessment of motor coordination, muscle synergies calculated by nonnegative matrix factorization have been investigated. However, the characteristics of muscle synergies in children with cerebral palsy are not understood.

Methods: This study compared the number of muscle synergies during gait between children with cerebral palsy and children with typical development and clarified whether certain clinical parameters differed according to the number of synergies.

Results: Children with cerebral palsy had significantly fewer synergies than children developing typically. The extent of spasticity and gait kinetics differed according to the number of synergies.

Conclusion: Increases in the number of synergies are limited by severe spasticity. The muscle synergies calculated by nonnegative matrix factorization have the potential to enable the quantification of motor coordination during gait.
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http://dx.doi.org/10.1097/PEP.0000000000000460DOI Listing
January 2018

Merging and Fractionation of Muscle Synergy Indicate the Recovery Process in Patients with Hemiplegia: The First Study of Patients after Subacute Stroke.

Neural Plast 2016 19;2016:5282957. Epub 2016 Dec 19.

Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.

Loss of motor coordination is one of the main problems for patients after stroke. Muscle synergy is widely accepted as an indicator of motor coordination. Recently, the characteristics of muscle synergy were quantitatively evaluated using nonnegative matrix factorization (NNMF) with surface electromyography. Previous studies have identified that the number and structure of synergies were associated with motor function in patients after stroke. However, most of these studies had a cross-sectional design, and the changes in muscle synergy during recovery process are not clear. In present study, two consecutive measurements were conducted for subacute patients after stroke and the change of number and structure of muscle synergies during gait were determined using NNMF. Results showed that functional change did not rely on number of synergies in patients after subacute stroke. However, the extent of merging of the synergies was negatively associated with an increase in muscle strength and the range of angle at ankle joint. Our results suggest that the neural changes represented by NNMF were related to the longitudinal change of function and gait pattern and that the merging of synergy is an important marker in patients after subacute stroke.
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http://dx.doi.org/10.1155/2016/5282957DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5206781PMC
August 2017
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