Superficial aponeurosis of human gastrocnemius is elongated during contraction: Implications for modeling muscle-tendon unit

Tadashi Muramatsu, Tetsuro Muraoka, Yasuo Kawakami, Tetsuo Fukunaga

研究成果: Article

26 引用 (Scopus)

抄録

Two questions were addressed in this study: (1) how much strain of the superficial aponeurosis of the human medial gastrocnemius muscle (MG) was obtained during voluntary isometric contractions in vivo, (2) whether there existed inhomogeneity of the strain along the superficial aponeurosis. Seven male subjects, whose knees were extended and ankles were flexed at right angle, performed isometric plantar flexion while elongation of superficial aponeurosis of MG was determined from the movements of the intersections made by the superficial aponeurosis and fascicles using ultrasonography. The strain of the superficial aponeurosis at the maximum voluntary contraction, estimated from the elongation and length data, was 5.6±1.2%. There was no significant difference in strain between the proximal and distal parts of the superficial aponeurosis. Based on the present result and that of our previous study for the same subjects (J. Appl. Physiol 90 (2001) 1671), a model was formulated for a contracting uni-pennate muscle-tendon unit. This model, which could be applied to isometric contractions at other angles and therefore of wide use, showed that similar strain between superficial and deep aponeuroses of MG contributed to homogeneous fascicle length change within MG during contractions. These findings would contribute to clarifying the functions of the superficial aponeurosis and the effects of the superficial aponeurosis elongation on the whole muscle behavior.

元の言語English
ページ(範囲)217-223
ページ数7
ジャーナルJournal of Biomechanics
35
発行部数2
DOI
出版物ステータスPublished - 2002
外部発表Yes

Fingerprint

Tendons
Muscle
Muscles
Elongation
Skeletal Muscle
Isometric Contraction
Ultrasonography
Aponeurosis
Muscle Contraction
Ankle
Knee

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

これを引用

Superficial aponeurosis of human gastrocnemius is elongated during contraction : Implications for modeling muscle-tendon unit. / Muramatsu, Tadashi; Muraoka, Tetsuro; Kawakami, Yasuo; Fukunaga, Tetsuo.

:: Journal of Biomechanics, 巻 35, 番号 2, 2002, p. 217-223.

研究成果: Article

@article{eaed4437a5524fe7a6ed5eb39c8cf981,
title = "Superficial aponeurosis of human gastrocnemius is elongated during contraction: Implications for modeling muscle-tendon unit",
abstract = "Two questions were addressed in this study: (1) how much strain of the superficial aponeurosis of the human medial gastrocnemius muscle (MG) was obtained during voluntary isometric contractions in vivo, (2) whether there existed inhomogeneity of the strain along the superficial aponeurosis. Seven male subjects, whose knees were extended and ankles were flexed at right angle, performed isometric plantar flexion while elongation of superficial aponeurosis of MG was determined from the movements of the intersections made by the superficial aponeurosis and fascicles using ultrasonography. The strain of the superficial aponeurosis at the maximum voluntary contraction, estimated from the elongation and length data, was 5.6±1.2{\%}. There was no significant difference in strain between the proximal and distal parts of the superficial aponeurosis. Based on the present result and that of our previous study for the same subjects (J. Appl. Physiol 90 (2001) 1671), a model was formulated for a contracting uni-pennate muscle-tendon unit. This model, which could be applied to isometric contractions at other angles and therefore of wide use, showed that similar strain between superficial and deep aponeuroses of MG contributed to homogeneous fascicle length change within MG during contractions. These findings would contribute to clarifying the functions of the superficial aponeurosis and the effects of the superficial aponeurosis elongation on the whole muscle behavior.",
keywords = "Aponeurosis, Human, Medial gastrocnemius muscle, Strain, Ultrasonography",
author = "Tadashi Muramatsu and Tetsuro Muraoka and Yasuo Kawakami and Tetsuo Fukunaga",
year = "2002",
doi = "10.1016/S0021-9290(01)00196-8",
language = "English",
volume = "35",
pages = "217--223",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "2",

}

TY - JOUR

T1 - Superficial aponeurosis of human gastrocnemius is elongated during contraction

T2 - Implications for modeling muscle-tendon unit

AU - Muramatsu, Tadashi

AU - Muraoka, Tetsuro

AU - Kawakami, Yasuo

AU - Fukunaga, Tetsuo

PY - 2002

Y1 - 2002

N2 - Two questions were addressed in this study: (1) how much strain of the superficial aponeurosis of the human medial gastrocnemius muscle (MG) was obtained during voluntary isometric contractions in vivo, (2) whether there existed inhomogeneity of the strain along the superficial aponeurosis. Seven male subjects, whose knees were extended and ankles were flexed at right angle, performed isometric plantar flexion while elongation of superficial aponeurosis of MG was determined from the movements of the intersections made by the superficial aponeurosis and fascicles using ultrasonography. The strain of the superficial aponeurosis at the maximum voluntary contraction, estimated from the elongation and length data, was 5.6±1.2%. There was no significant difference in strain between the proximal and distal parts of the superficial aponeurosis. Based on the present result and that of our previous study for the same subjects (J. Appl. Physiol 90 (2001) 1671), a model was formulated for a contracting uni-pennate muscle-tendon unit. This model, which could be applied to isometric contractions at other angles and therefore of wide use, showed that similar strain between superficial and deep aponeuroses of MG contributed to homogeneous fascicle length change within MG during contractions. These findings would contribute to clarifying the functions of the superficial aponeurosis and the effects of the superficial aponeurosis elongation on the whole muscle behavior.

AB - Two questions were addressed in this study: (1) how much strain of the superficial aponeurosis of the human medial gastrocnemius muscle (MG) was obtained during voluntary isometric contractions in vivo, (2) whether there existed inhomogeneity of the strain along the superficial aponeurosis. Seven male subjects, whose knees were extended and ankles were flexed at right angle, performed isometric plantar flexion while elongation of superficial aponeurosis of MG was determined from the movements of the intersections made by the superficial aponeurosis and fascicles using ultrasonography. The strain of the superficial aponeurosis at the maximum voluntary contraction, estimated from the elongation and length data, was 5.6±1.2%. There was no significant difference in strain between the proximal and distal parts of the superficial aponeurosis. Based on the present result and that of our previous study for the same subjects (J. Appl. Physiol 90 (2001) 1671), a model was formulated for a contracting uni-pennate muscle-tendon unit. This model, which could be applied to isometric contractions at other angles and therefore of wide use, showed that similar strain between superficial and deep aponeuroses of MG contributed to homogeneous fascicle length change within MG during contractions. These findings would contribute to clarifying the functions of the superficial aponeurosis and the effects of the superficial aponeurosis elongation on the whole muscle behavior.

KW - Aponeurosis

KW - Human

KW - Medial gastrocnemius muscle

KW - Strain

KW - Ultrasonography

UR - http://www.scopus.com/inward/record.url?scp=0036137699&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036137699&partnerID=8YFLogxK

U2 - 10.1016/S0021-9290(01)00196-8

DO - 10.1016/S0021-9290(01)00196-8

M3 - Article

C2 - 11784540

AN - SCOPUS:0036137699

VL - 35

SP - 217

EP - 223

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 2

ER -