Task-Dependent Gastrocnemius Fiber Movement in Humans while Standing as Revealed by Ultrasound Images

Tasuku Miyoshi, Motoki Takagi, Adiljan Yimit, Yoshihiro Hagihara, Takashi Komeda

研究成果: Conference contribution

1 引用 (Scopus)

抜粋

Although electromyographic (EMG) activities of the gastrocnemius muscle (GAS) increase while a body sways voluntarily and rises on tiptoe from a standing position, the effects of movement speed on the upright postural task-dependent GAS fibers are unclear. The present study was to demonstrate GAS fiber movement during anterior-posterior bodily swaying and tiptoe-heel standing tasks using a time series of ultrasound images. Subjects achieved two postural tasks, each under three movement frequencies, 0.1Hz, 0.2Hz, and 0.3Hz, while sinuous-like modulations of ankle angular displacement patterns were recorded. The GAS fiber movements revealed by the ultrasound images were analyzed with respect to ankle angular displacement and movement velocity. The results showed that GAS fibers shortened when the body was in an incline position while swaying back and forth and standing on tiptoes. The amplitude of the GAS fiber movement increased with the increase of peak-to-peak ankle angular displacement and was less dependent on joint angular velocities. These results suggest that the roles of shortened GAS fiber movements are to produce ankle plantarflexion torque to prevent a fall while in an upright posture. Further, increased electromyography levels of the GAS reflect the effect of voluntary motor commands since GAS fiber movement would follow geometric constraints, such as ankle angular displacement.

元の言語English
ホスト出版物のタイトルFrontiers in Artificial Intelligence and Applications
出版者IOS Press
ページ378-388
ページ数11
276
ISBN(印刷物)9781614995210
DOI
出版物ステータスPublished - 2015
イベントInternational Conference on System Science and Engineering, ICSSE 2015 - Morioka, Japan
継続期間: 2015 7 62015 7 8

出版物シリーズ

名前Frontiers in Artificial Intelligence and Applications
276
ISSN(印刷物)09226389

Other

OtherInternational Conference on System Science and Engineering, ICSSE 2015
Japan
Morioka
期間15/7/615/7/8

ASJC Scopus subject areas

  • Artificial Intelligence

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  • これを引用

    Miyoshi, T., Takagi, M., Yimit, A., Hagihara, Y., & Komeda, T. (2015). Task-Dependent Gastrocnemius Fiber Movement in Humans while Standing as Revealed by Ultrasound Images. : Frontiers in Artificial Intelligence and Applications (巻 276, pp. 378-388). (Frontiers in Artificial Intelligence and Applications; 巻数 276). IOS Press. https://doi.org/10.3233/978-1-61499-522-7-378