Muscle movements depend on position of the center-of-mass relative to the ankle center of rotation in humans

T. Miyoshi, H. Yamamoto, S. I. Yamamoto, H. Koyama, T. Komeda

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

In a recent study, it was shown that medial gastrocnemius (GAS) muscle fiber movements while Standing upright were paradoxical compared to anatomical demands, which suggested that this movement is involved in ankle support torque. In this respect, we hypothesized that the GAS movements while standing upright depend on the positions of the center of mass (COM) relative to the center of rotation of the ankle joint The objective of this study was to investigate changes in the GAS fiber length while subjects stood upright performing one of two postural tasks: swaying their bodies or standing on their tiptoes or heels. Ultrasonography of the GAS was recorded to detect the changes in the GAS fiber length in viva In addition, the center of pressure and the ankle joint angular displacements were recorded to use as visual feedback signals in two postural tasks. When subjects swayed their body in an anterior-posterior direction, the GAS fiber lengths were shortened, whereas they were lengthened while standing on their tiptoes or heels. Namely, the length of the GAS fiber changes when the body is swaying, which demonstrates an anti-phasic pattern within the dorsiflexed ankle, whereas, when subjects were on their tiptoes or heels, the movement was in-phase. The results suggest that the changes in the length of the GAS fiber while Standing upright depend on the COM position relative to the center of rotation of the ankle joint.

本文言語English
ホスト出版物のタイトル2007 IEEE/ICME International Conference on Complex Medical Engineering, CME 2007
ページ1258-1262
ページ数5
DOI
出版ステータスPublished - 2007
イベント2007 IEEE/ICME International Conference on Complex Medical Engineering, CME 2007 - Beijing, China
継続期間: 2007 5月 232007 5月 27

出版物シリーズ

名前2007 IEEE/ICME International Conference on Complex Medical Engineering, CME 2007

Conference

Conference2007 IEEE/ICME International Conference on Complex Medical Engineering, CME 2007
国/地域China
CityBeijing
Period07/5/2307/5/27

ASJC Scopus subject areas

  • 生体医工学
  • 医学一般

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