Different contraction pattern of lower leg muscle fiber between swaying and tiptoe standing in human upright posture

S. Yamamoto, C. Shimizu, H. Yamamoto, N. Sasagawa, T. Miyoshi, H. Koyama, T. Komeda

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

Abstract

In recent studies, it is shown that gastrocnemius (GAS) muscle fiber movements in upright standing were paradoxical as compared to the movement of whole muscle length depended on the ankle joint movement. We hypothesized these muscle fiber movement depend on the position of the center of mass (COM) relative to the center of rotation of the ankle joint. The purpose of this study was to examine the change of muscle fiber length in GAS and tibialis anterior (TA) muscles while upright standing postures: swaying anterior-posterior and standing tiptoe-heel. Ultrasonography of the GAS and TA was recorded to detect the change of muscle fiber length in vivo. 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 anterior-posterior direction repeatedly, the relationship between the whole muscle length and the muscle fiber length was an anti-phasic pattern in both muscles. However, when subjects stood on their tiptoe/heel repeatedly, the relationship between the whole muscle length and the muscle fiber length was an in-phasic pattern. These results suggest that the changes in the muscle fiber length of the lower leg while standing upright depend on the COM position relative to the center of rotation of the ankle joint.

Original languageEnglish
Title of host publication4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008
Pages2128-2132
Number of pages5
DOIs
Publication statusPublished - 2008 Dec 1
Event4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008 - Antwerp, Belgium
Duration: 2008 Nov 232008 Nov 27

Publication series

NameIFMBE Proceedings
Volume22
ISSN (Print)1680-0737

Conference

Conference4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008
CountryBelgium
CityAntwerp
Period08/11/2308/11/27

Keywords

  • Motor Control
  • Muscle Fiber Length
  • Posture
  • Ultrasonography

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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    Yamamoto, S., Shimizu, C., Yamamoto, H., Sasagawa, N., Miyoshi, T., Koyama, H., & Komeda, T. (2008). Different contraction pattern of lower leg muscle fiber between swaying and tiptoe standing in human upright posture. In 4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008 (pp. 2128-2132). (IFMBE Proceedings; Vol. 22). https://doi.org/10.1007/978-3-540-89208-3_508