Chaotic features of rhythmic joint movement

Hirokazu Iwase, Atsuo Murata

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

2 Citations (Scopus)

Abstract

The purpose of this study is to show the chaotic features of rhythmic joint movement (elbow bending and stretching exercises) using a reconstructed phase portrait, fractal dimension, and first Lyapunov exponent. The subjects were seven male students who were right-handed. Depending on the experimental conditions, one (or both) elbow angle(s) was (were) measured by one (or two) goniometer(s). Single-forearm movements were recorded for the right arm and the left arm separately. After that, they performed in-phase movements with both arms followed by anti-phase movements. All sessions started with unpaced movements at a personal tempo and amplitude. This trial was followed by six trials that were paced by signals from a personal computer. Pacing was provided for six different frequencies (1, 2, 3, 4, 5, and 6 Hz) presented in random order. When the frequency of the pace increased, the fractal dimension and first Lyapunov exponent tended to increase. Moreover, the first Lyapunov exponent obtained positive values for all of the observed data. These results indicate that there is chaos in rhythmic joint movement and that the larger the frequency, the more chaotic the joint movement becomes.

Original languageEnglish
Title of host publicationProceedings of the IEEE International Conference on Systems, Man and Cybernetics
Pages40-45
Number of pages6
Volume1
Publication statusPublished - 2001
Externally publishedYes
Event2001 IEEE International Conference on Systems, Man and Cybernetics - Tucson, AZ, United States
Duration: Oct 7 2001Oct 10 2001

Other

Other2001 IEEE International Conference on Systems, Man and Cybernetics
CountryUnited States
CityTucson, AZ
Period10/7/0110/10/01

Fingerprint

Fractal dimension
Goniometers
Chaos theory
Personal computers
Stretching
Students

Keywords

  • Chaotic analysis
  • Fractal dimension
  • Lyapunov exponent
  • Rhythmic movement

ASJC Scopus subject areas

  • Hardware and Architecture
  • Control and Systems Engineering

Cite this

Iwase, H., & Murata, A. (2001). Chaotic features of rhythmic joint movement. In Proceedings of the IEEE International Conference on Systems, Man and Cybernetics (Vol. 1, pp. 40-45)

Chaotic features of rhythmic joint movement. / Iwase, Hirokazu; Murata, Atsuo.

Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 1 2001. p. 40-45.

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

Iwase, H & Murata, A 2001, Chaotic features of rhythmic joint movement. in Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. vol. 1, pp. 40-45, 2001 IEEE International Conference on Systems, Man and Cybernetics, Tucson, AZ, United States, 10/7/01.
Iwase H, Murata A. Chaotic features of rhythmic joint movement. In Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 1. 2001. p. 40-45
Iwase, Hirokazu ; Murata, Atsuo. / Chaotic features of rhythmic joint movement. Proceedings of the IEEE International Conference on Systems, Man and Cybernetics. Vol. 1 2001. pp. 40-45
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