Quantitative evaluation of upper limb spasticity in the sitting and standing positions

Takanori Uchiyama, S. Obata, R. Uchida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The objective of this study is to develop a technique for the quantitative evaluation of spasticity in the upper limbs. The subjects were two healthy volunteers and 19 hemiplegic patients. Each subject was seated or standing in a resting state, and the forearm was flexed five times and extended five times in each posture through a force-and-torque sensor placed on the wrist. The forearms of subjects who could not stand up were flexed and extended only in a seated position. The elbow joint angle, torque, and electromyograms (EMGs) of the biceps brachii muscle, triceps brachii muscle, and brachioradialis muscle during flexion and extension were measured. The inertia of forearms and visco-elastic coefficients were estimated by the least squares method with a mathematical model that consisted of elastic components depending on the elbow joint angle and muscle activities. The elbow joint angle and torque were then estimated with the obtained inertia and visco-elastic coefficients and compared to the observed angle and torque in order to evaluate the performance of the mathematical model. The elbow joint angle and torque were closely estimated by the mathematical model. Next, the maximum value of the elastic coefficient during flexion/ extension around the elbow joint (kmax) was calculated and compared with the Ashworth scale. The results show that the kmax had a tendency to increase as the Ashworth scale increased. In conclusion, the mathematical model could represent the relationship between the elbow joint angle and torque. The kmax would be medically and clinically useful for the quantitative evaluation of spasticity in hemiplegic patients.

Original languageEnglish
Title of host publicationIFMBE Proceedings
PublisherSpringer Verlag
Pages2931-2934
Number of pages4
Volume14
Edition1
Publication statusPublished - 2007
Event10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of
Duration: 2006 Aug 272006 Sep 1

Other

Other10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
CountryKorea, Republic of
CitySeoul
Period06/8/2706/9/1

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Keywords

  • Elasticity
  • Elbow
  • Spasticity

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

Cite this

Uchiyama, T., Obata, S., & Uchida, R. (2007). Quantitative evaluation of upper limb spasticity in the sitting and standing positions. In IFMBE Proceedings (1 ed., Vol. 14, pp. 2931-2934). Springer Verlag.