Measurement of human Gracilis muscle isometric forces as a function of knee angle, intraoperatively

Can A. Yucesoy, Filiz Ateş, Umut Akgün, Mustafa Karahan

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The goals of the present study were (1) to measure the previously unstudied isometric forces of activated human Gracilis (G) muscle as a function of knee joint angle and (2) to test whether length history effects are important also for human muscle. Experiments were conducted intraoperatively during anterior cruciate ligament (ACL) reconstruction surgery (n=8). Mean peak G muscle force, mean peak G tendon stress and mean optimal knee angle equals 178.5±270.3. N, 24.4±20.6. MPa and 67.5±41.7°, respectively. The substantial inter-subject variability found (e.g., peak G force ranges between 17.2 and 490.5. N) indicate that the contribution of the G muscle to knee flexion moment may vary considerably among subjects. Moreover, typical subject anthropometrics did not appear to provide a sound estimate of the peak G force: only a limited insignificant correlation was found between peak G force and subject mass as well as mid-thigh perimeter and no correlation was found between peak G force and thigh length. The functional joint range of motion for human G muscle was determined to be at least as wide as full knee extension to 120° of knee flexion. However; the portion of the knee angle-muscle force relationship operationalized is not unique but individual specific: our data suggest for most subjects that G muscle operates in both ascending and descending limbs of its length-force characteristics whereas, for the remainder of the subjects, its function is limited to the descending limb, exclusively. Previous activity of G muscle at high muscle length attained during collection of a complete set of knee angle-force data showed for the first time that such length history effects are important also for human muscles: a significant correlation was found between optimal knee angle and absolute value of % force change. Except for two of the subjects, G muscle force measured at low length was lower than that measured during collection of knee joint-force data (maximally by 42.3%).

Original languageEnglish
Pages (from-to)2665-2671
Number of pages7
JournalJournal of Biomechanics
Volume43
Issue number14
DOIs
Publication statusPublished - 2010 Oct 19
Externally publishedYes

Fingerprint

Muscle
Knee
Gravitation
Muscles
Knee Joint
Thigh
Extremities
History
Gracilis Muscle
Anterior Cruciate Ligament Reconstruction
Articular Range of Motion
Ligaments
Tendons
Surgery
Acoustic waves

Keywords

  • Gracilis muscle
  • Intraoperative measurements in human
  • Length history effects
  • Muscle knee angle-force characteristics

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Rehabilitation
  • Biophysics
  • Biomedical Engineering

Cite this

Measurement of human Gracilis muscle isometric forces as a function of knee angle, intraoperatively. / Yucesoy, Can A.; Ateş, Filiz; Akgün, Umut; Karahan, Mustafa.

In: Journal of Biomechanics, Vol. 43, No. 14, 19.10.2010, p. 2665-2671.

Research output: Contribution to journalArticle

Yucesoy, Can A. ; Ateş, Filiz ; Akgün, Umut ; Karahan, Mustafa. / Measurement of human Gracilis muscle isometric forces as a function of knee angle, intraoperatively. In: Journal of Biomechanics. 2010 ; Vol. 43, No. 14. pp. 2665-2671.
@article{e1779180a4f442ef917d0bf737571f22,
title = "Measurement of human Gracilis muscle isometric forces as a function of knee angle, intraoperatively",
abstract = "The goals of the present study were (1) to measure the previously unstudied isometric forces of activated human Gracilis (G) muscle as a function of knee joint angle and (2) to test whether length history effects are important also for human muscle. Experiments were conducted intraoperatively during anterior cruciate ligament (ACL) reconstruction surgery (n=8). Mean peak G muscle force, mean peak G tendon stress and mean optimal knee angle equals 178.5±270.3. N, 24.4±20.6. MPa and 67.5±41.7°, respectively. The substantial inter-subject variability found (e.g., peak G force ranges between 17.2 and 490.5. N) indicate that the contribution of the G muscle to knee flexion moment may vary considerably among subjects. Moreover, typical subject anthropometrics did not appear to provide a sound estimate of the peak G force: only a limited insignificant correlation was found between peak G force and subject mass as well as mid-thigh perimeter and no correlation was found between peak G force and thigh length. The functional joint range of motion for human G muscle was determined to be at least as wide as full knee extension to 120° of knee flexion. However; the portion of the knee angle-muscle force relationship operationalized is not unique but individual specific: our data suggest for most subjects that G muscle operates in both ascending and descending limbs of its length-force characteristics whereas, for the remainder of the subjects, its function is limited to the descending limb, exclusively. Previous activity of G muscle at high muscle length attained during collection of a complete set of knee angle-force data showed for the first time that such length history effects are important also for human muscles: a significant correlation was found between optimal knee angle and absolute value of {\%} force change. Except for two of the subjects, G muscle force measured at low length was lower than that measured during collection of knee joint-force data (maximally by 42.3{\%}).",
keywords = "Gracilis muscle, Intraoperative measurements in human, Length history effects, Muscle knee angle-force characteristics",
author = "Yucesoy, {Can A.} and Filiz Ateş and Umut Akg{\"u}n and Mustafa Karahan",
year = "2010",
month = "10",
day = "19",
doi = "10.1016/j.jbiomech.2010.06.002",
language = "English",
volume = "43",
pages = "2665--2671",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "14",

}

TY - JOUR

T1 - Measurement of human Gracilis muscle isometric forces as a function of knee angle, intraoperatively

AU - Yucesoy, Can A.

AU - Ateş, Filiz

AU - Akgün, Umut

AU - Karahan, Mustafa

PY - 2010/10/19

Y1 - 2010/10/19

N2 - The goals of the present study were (1) to measure the previously unstudied isometric forces of activated human Gracilis (G) muscle as a function of knee joint angle and (2) to test whether length history effects are important also for human muscle. Experiments were conducted intraoperatively during anterior cruciate ligament (ACL) reconstruction surgery (n=8). Mean peak G muscle force, mean peak G tendon stress and mean optimal knee angle equals 178.5±270.3. N, 24.4±20.6. MPa and 67.5±41.7°, respectively. The substantial inter-subject variability found (e.g., peak G force ranges between 17.2 and 490.5. N) indicate that the contribution of the G muscle to knee flexion moment may vary considerably among subjects. Moreover, typical subject anthropometrics did not appear to provide a sound estimate of the peak G force: only a limited insignificant correlation was found between peak G force and subject mass as well as mid-thigh perimeter and no correlation was found between peak G force and thigh length. The functional joint range of motion for human G muscle was determined to be at least as wide as full knee extension to 120° of knee flexion. However; the portion of the knee angle-muscle force relationship operationalized is not unique but individual specific: our data suggest for most subjects that G muscle operates in both ascending and descending limbs of its length-force characteristics whereas, for the remainder of the subjects, its function is limited to the descending limb, exclusively. Previous activity of G muscle at high muscle length attained during collection of a complete set of knee angle-force data showed for the first time that such length history effects are important also for human muscles: a significant correlation was found between optimal knee angle and absolute value of % force change. Except for two of the subjects, G muscle force measured at low length was lower than that measured during collection of knee joint-force data (maximally by 42.3%).

AB - The goals of the present study were (1) to measure the previously unstudied isometric forces of activated human Gracilis (G) muscle as a function of knee joint angle and (2) to test whether length history effects are important also for human muscle. Experiments were conducted intraoperatively during anterior cruciate ligament (ACL) reconstruction surgery (n=8). Mean peak G muscle force, mean peak G tendon stress and mean optimal knee angle equals 178.5±270.3. N, 24.4±20.6. MPa and 67.5±41.7°, respectively. The substantial inter-subject variability found (e.g., peak G force ranges between 17.2 and 490.5. N) indicate that the contribution of the G muscle to knee flexion moment may vary considerably among subjects. Moreover, typical subject anthropometrics did not appear to provide a sound estimate of the peak G force: only a limited insignificant correlation was found between peak G force and subject mass as well as mid-thigh perimeter and no correlation was found between peak G force and thigh length. The functional joint range of motion for human G muscle was determined to be at least as wide as full knee extension to 120° of knee flexion. However; the portion of the knee angle-muscle force relationship operationalized is not unique but individual specific: our data suggest for most subjects that G muscle operates in both ascending and descending limbs of its length-force characteristics whereas, for the remainder of the subjects, its function is limited to the descending limb, exclusively. Previous activity of G muscle at high muscle length attained during collection of a complete set of knee angle-force data showed for the first time that such length history effects are important also for human muscles: a significant correlation was found between optimal knee angle and absolute value of % force change. Except for two of the subjects, G muscle force measured at low length was lower than that measured during collection of knee joint-force data (maximally by 42.3%).

KW - Gracilis muscle

KW - Intraoperative measurements in human

KW - Length history effects

KW - Muscle knee angle-force characteristics

UR - http://www.scopus.com/inward/record.url?scp=77954428794&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954428794&partnerID=8YFLogxK

U2 - 10.1016/j.jbiomech.2010.06.002

DO - 10.1016/j.jbiomech.2010.06.002

M3 - Article

C2 - 20655048

AN - SCOPUS:77954428794

VL - 43

SP - 2665

EP - 2671

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 14

ER -