Changes of muscle fiber length in vivo during walking as revealed by ultrasound images

N. Sasagawa, T. Miyoshi, S. I. Yamamoto

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

Abstract

The objective of this study was to investigate our hypothesis involving treadmill walking as revealed by time series of ultrasound images. The hypothesis is that the changes in the length of muscle fiber (MFL) of the triceps surae muscle depend on the position of the center of mass (COM) relative to the ankle joint center of rotation. Seven healthy subjects participated in this experiment. The time series of ultrasound images in MG and the joint angular displacements in the hip, knee, and ankle were recorded while the subjects walked on a treadmill at speeds of 3.0 and 4.0 km/h. The MFL in MG was lengthened at the early stance phase and shortened at the late stance phase. Namely, the changes in the MFL of MG while treadmill walking followed our hypothesis, which was demonstrated while standing upright. These results suggest that the propulsive torque around the ankle joint is controlled by the shortening of the MFL in MG, whereas the MG muscle was in the eccentric contraction phase.

Original languageEnglish
Title of host publication4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008
Pages2113-2115
Number of pages3
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

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Keywords

  • Center of ankle rotation
  • Center of mass
  • Muscle fiber movements
  • Treadmill walking
  • Ultrasound images

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

Cite this

Sasagawa, N., Miyoshi, T., & Yamamoto, S. I. (2008). Changes of muscle fiber length in vivo during walking as revealed by ultrasound images. In 4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008 (pp. 2113-2115). (IFMBE Proceedings; Vol. 22). https://doi.org/10.1007/978-3-540-89208-3_504