In vivo passive mechanical properties of the human gastrocnemius muscle belly

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 extens...

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Bibliographic Details
Published in:Journal of biomechanics 2005-06, Vol.38 (6), p.1213-1219
Main Authors: Muraoka, Tetsuro, Chino, Kentaro, Muramatsu, Tadashi, Fukunaga, Tetsuo, Kanehisa, Hiroaki
Format: Article
Language:English
Subjects:
Adult
Ankle
Ankle Joint - physiology
Biarticular muscle
Biomechanical Phenomena - instrumentation
Biomechanical Phenomena - methods
Elasticity
Humans
Knee
Male
Mechanical properties
Models, Biological
Muscle fascicle length
Muscle, Skeletal - diagnostic imaging
Muscle, Skeletal - physiology
Personal computers
Range of Motion, Articular - physiology
Stress, Mechanical
Ultrasonic imaging
Ultrasonography
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Summary: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
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2004.06.012