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

N. Sasagawa, T. Miyoshi, Shinichirou 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 publicationIFMBE Proceedings
Pages2113-2115
Number of pages3
Volume22
DOIs
Publication statusPublished - 2008
Event4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008 - Antwerp
Duration: 2008 Nov 232008 Nov 27

Other

Other4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008
CityAntwerp
Period08/11/2308/11/27

Fingerprint

Exercise equipment
Muscle
Ultrasonics
Fibers
Time series
Torque
Experiments

Keywords

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

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

Cite this

Changes of muscle fiber length in vivo during walking as revealed by ultrasound images. / Sasagawa, N.; Miyoshi, T.; Yamamoto, Shinichirou.

IFMBE Proceedings. Vol. 22 2008. p. 2113-2115.

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

Sasagawa, N, Miyoshi, T & Yamamoto, S 2008, Changes of muscle fiber length in vivo during walking as revealed by ultrasound images. in IFMBE Proceedings. vol. 22, pp. 2113-2115, 4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008, Antwerp, 08/11/23. https://doi.org/10.1007/978-3-540-89208-3_504
Sasagawa, N. ; Miyoshi, T. ; Yamamoto, Shinichirou. / Changes of muscle fiber length in vivo during walking as revealed by ultrasound images. IFMBE Proceedings. Vol. 22 2008. pp. 2113-2115
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