Estimation of musculotendon kinematics under controlled tendon indentation

Matthieu K. Chardon, Yasin Y. Dhaher, Nina I. Suresh, Giselle Jaramillo, W. Zev Rymer

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effects of tendon indentation on musculotendon unit mechanics have been left largely unexplored. Tendon indentation is however routinely used in the tendon reflex exam to diagnose the state of reflex pathways. Because muscle mechanoreceptors are sensitive to mechanical changes of the musculotendon unit, this gap in knowledge could potentially impact our understanding of these neurological exams. Accordingly, we have used ultrasound (US) imaging to compare the effects of tendon indentation with the effects angular rotation of the elbow in six neurologically intact individuals. We used sagittal ultrasound movies of the biceps brachii to compare length changes induced by each of these perturbations. Length changes were quantified using a pixel-tracking protocol.Our results show that a 20. mm indentation of the distal tendon is broadly equivalent to a 15° elbow rotation. We also show that within the imaging window the strain differences between the two stretching protocols are statistically insignificant. Finally, we show that there exists a significant linear relationship between the two stretching techniques and that this relationship spans a large rotational angle to indentation depth. We have used a novel tendon probe to administer controlled tendon indentations as a way to characterize musculotendon kinematics. Using this probe, we confirm that tendon indentation can be physiologically equated with joint rotation, and can thus be used as an input for muscle stretching protocols. Furthermore, this is potentially a simpler and more practical alternative to externally imposed angular joint motion.

Original languageEnglish (US)
Pages (from-to)3568-3576
Number of pages9
JournalJournal of Biomechanics
Volume48
Issue number13
DOIs
StatePublished - Oct 15 2015
Externally publishedYes

Fingerprint

Tendons
Indentation
Biomechanical Phenomena
Kinematics
Stretching
Elbow
Muscle
Joints
Ultrasonics
Stretch Reflex
Muscles
Mechanoreceptors
Imaging techniques
Motion Pictures
Mechanics
Reflex
Ultrasonography
Pixels

Keywords

  • Joint rotation
  • Kinematics
  • Musculotendon unit
  • Skeletal muscle stretch
  • Tendon indentation

ASJC Scopus subject areas

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

Cite this

Estimation of musculotendon kinematics under controlled tendon indentation. / Chardon, Matthieu K.; Dhaher, Yasin Y.; Suresh, Nina I.; Jaramillo, Giselle; Zev Rymer, W.

In: Journal of Biomechanics, Vol. 48, No. 13, 15.10.2015, p. 3568-3576.

Research output: Contribution to journalArticle

Chardon, Matthieu K. ; Dhaher, Yasin Y. ; Suresh, Nina I. ; Jaramillo, Giselle ; Zev Rymer, W. / Estimation of musculotendon kinematics under controlled tendon indentation. In: Journal of Biomechanics. 2015 ; Vol. 48, No. 13. pp. 3568-3576.
@article{342080d2e98441228636f0cabd48be5a,
title = "Estimation of musculotendon kinematics under controlled tendon indentation",
abstract = "The effects of tendon indentation on musculotendon unit mechanics have been left largely unexplored. Tendon indentation is however routinely used in the tendon reflex exam to diagnose the state of reflex pathways. Because muscle mechanoreceptors are sensitive to mechanical changes of the musculotendon unit, this gap in knowledge could potentially impact our understanding of these neurological exams. Accordingly, we have used ultrasound (US) imaging to compare the effects of tendon indentation with the effects angular rotation of the elbow in six neurologically intact individuals. We used sagittal ultrasound movies of the biceps brachii to compare length changes induced by each of these perturbations. Length changes were quantified using a pixel-tracking protocol.Our results show that a 20. mm indentation of the distal tendon is broadly equivalent to a 15° elbow rotation. We also show that within the imaging window the strain differences between the two stretching protocols are statistically insignificant. Finally, we show that there exists a significant linear relationship between the two stretching techniques and that this relationship spans a large rotational angle to indentation depth. We have used a novel tendon probe to administer controlled tendon indentations as a way to characterize musculotendon kinematics. Using this probe, we confirm that tendon indentation can be physiologically equated with joint rotation, and can thus be used as an input for muscle stretching protocols. Furthermore, this is potentially a simpler and more practical alternative to externally imposed angular joint motion.",
keywords = "Joint rotation, Kinematics, Musculotendon unit, Skeletal muscle stretch, Tendon indentation",
author = "Chardon, {Matthieu K.} and Dhaher, {Yasin Y.} and Suresh, {Nina I.} and Giselle Jaramillo and {Zev Rymer}, W.",
year = "2015",
month = "10",
day = "15",
doi = "10.1016/j.jbiomech.2015.07.024",
language = "English (US)",
volume = "48",
pages = "3568--3576",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "13",

}

TY - JOUR

T1 - Estimation of musculotendon kinematics under controlled tendon indentation

AU - Chardon, Matthieu K.

AU - Dhaher, Yasin Y.

AU - Suresh, Nina I.

AU - Jaramillo, Giselle

AU - Zev Rymer, W.

PY - 2015/10/15

Y1 - 2015/10/15

N2 - The effects of tendon indentation on musculotendon unit mechanics have been left largely unexplored. Tendon indentation is however routinely used in the tendon reflex exam to diagnose the state of reflex pathways. Because muscle mechanoreceptors are sensitive to mechanical changes of the musculotendon unit, this gap in knowledge could potentially impact our understanding of these neurological exams. Accordingly, we have used ultrasound (US) imaging to compare the effects of tendon indentation with the effects angular rotation of the elbow in six neurologically intact individuals. We used sagittal ultrasound movies of the biceps brachii to compare length changes induced by each of these perturbations. Length changes were quantified using a pixel-tracking protocol.Our results show that a 20. mm indentation of the distal tendon is broadly equivalent to a 15° elbow rotation. We also show that within the imaging window the strain differences between the two stretching protocols are statistically insignificant. Finally, we show that there exists a significant linear relationship between the two stretching techniques and that this relationship spans a large rotational angle to indentation depth. We have used a novel tendon probe to administer controlled tendon indentations as a way to characterize musculotendon kinematics. Using this probe, we confirm that tendon indentation can be physiologically equated with joint rotation, and can thus be used as an input for muscle stretching protocols. Furthermore, this is potentially a simpler and more practical alternative to externally imposed angular joint motion.

AB - The effects of tendon indentation on musculotendon unit mechanics have been left largely unexplored. Tendon indentation is however routinely used in the tendon reflex exam to diagnose the state of reflex pathways. Because muscle mechanoreceptors are sensitive to mechanical changes of the musculotendon unit, this gap in knowledge could potentially impact our understanding of these neurological exams. Accordingly, we have used ultrasound (US) imaging to compare the effects of tendon indentation with the effects angular rotation of the elbow in six neurologically intact individuals. We used sagittal ultrasound movies of the biceps brachii to compare length changes induced by each of these perturbations. Length changes were quantified using a pixel-tracking protocol.Our results show that a 20. mm indentation of the distal tendon is broadly equivalent to a 15° elbow rotation. We also show that within the imaging window the strain differences between the two stretching protocols are statistically insignificant. Finally, we show that there exists a significant linear relationship between the two stretching techniques and that this relationship spans a large rotational angle to indentation depth. We have used a novel tendon probe to administer controlled tendon indentations as a way to characterize musculotendon kinematics. Using this probe, we confirm that tendon indentation can be physiologically equated with joint rotation, and can thus be used as an input for muscle stretching protocols. Furthermore, this is potentially a simpler and more practical alternative to externally imposed angular joint motion.

KW - Joint rotation

KW - Kinematics

KW - Musculotendon unit

KW - Skeletal muscle stretch

KW - Tendon indentation

UR - http://www.scopus.com/inward/record.url?scp=84943582274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84943582274&partnerID=8YFLogxK

U2 - 10.1016/j.jbiomech.2015.07.024

DO - 10.1016/j.jbiomech.2015.07.024

M3 - Article

C2 - 26321363

AN - SCOPUS:84943582274

VL - 48

SP - 3568

EP - 3576

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 13

ER -