In vivo passive mechanical properties of the human gastrocnemius muscle belly

Tetsuro Muraoka, Kentaro Chino, Tadashi Muramatsu, Tetsuo Fukunaga, Hiroaki Kanehisa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The purpose of the present study was to determine the in vivo passive mechanical properties, including the length below the slack length, of the gastrocnemius muscle (GAS) belly in humans. Transverse ultrasound images of the medial head of the GAS were taken in 11 subjects during passive knee extension from 80° to 5° with a constant ankle joint angle of 10° (0° is the neutral ankle position: positive values for dorsiflexion). The change in passive ankle joint moment (Mp), which is produced only by the GAS length change, was also measured during passive knee extension. The onset of Mp during passive knee extension was found to be 43±8° (mean±SD) when the baseline of the Mp was set at the average Mp in the range of 55-60° where the Mp was almost constant (SD<0.03Nm). At this onset, the muscle fascicle length of the GAS (Lf) was 46±7mm (slack length; Lfs). Lf at 80° was 6±4mm (13±6%) less than the Lfs, and Lf at 5° was 12±5mm (27±11%) greater than the Lfs. The passive force-resisting compression of the GAS did not produce a dorsiflexion moment in the joint angle range adopted. The passive ankle joint moment increased linearly with Lf (coefficient of determination (R2)=0.85-0.96), and the slopes of the relationships between Lf and Mp, and between the relative Lf to Lfs and Mp were 0.093±0.038Nm/mm and 0.043±0.021Nm/%Lfs. The findings of the present study can be implemented in musculoskeletal modeling, which would provide a more accurate evaluation of the passive mechanical properties of muscle during movement.

Original languageEnglish
Pages (from-to)1213-1219
Number of pages7
JournalJournal of Biomechanics
Volume38
Issue number6
DOIs
Publication statusPublished - 2005 Jun

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Muscle
Skeletal Muscle
Ankle Joint
Mechanical properties
Knee
Muscles
Ankle
Joints
Ultrasonics

Keywords

  • Biarticular muscle
  • Muscle fascicle length
  • Ultrasonography

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

In vivo passive mechanical properties of the human gastrocnemius muscle belly. / Muraoka, Tetsuro; Chino, Kentaro; Muramatsu, Tadashi; Fukunaga, Tetsuo; Kanehisa, Hiroaki.

In: Journal of Biomechanics, Vol. 38, No. 6, 06.2005, p. 1213-1219.

Research output: Contribution to journalArticle

Muraoka, Tetsuro ; Chino, Kentaro ; Muramatsu, Tadashi ; Fukunaga, Tetsuo ; Kanehisa, Hiroaki. / In vivo passive mechanical properties of the human gastrocnemius muscle belly. In: Journal of Biomechanics. 2005 ; Vol. 38, No. 6. pp. 1213-1219.
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