Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo

Tetsuro Muraoka, Tadashi Muramatsu, Tetsuo Fukunaga, Hiroaki Kanehisa

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

The purpose of this study was to clarify the influence of muscle-tendon complex stretch on electromechanical delay (EMD) in terms of the extent of tendon slack in the human medial gastrocnemius (MG). EMD and MG tendon length were measured at each of five ankle joint angles (-30, -20, -10, 0, and 5°: positive values for dorsiflexion) using percutaneous electrical stimulation and ultrasonography, respectively. The extent of MG tendon slack was calculated as MG tendon length shortening, standardized with MG tendon slack length obtained at the joint angle (-16° ± 5°) where the passive ankle joint torque was zero. EMD at -30° (19.2 ± 2.2 ms) and -20° (17.2 ± 1.3 ms) was significantly greater than that at -10° (16.0 ± 2.3 ms), 0° (15.0 ± 1.4 ms), and 5° (14.8 ± 1.4 ms), and at 0 and 5°, respectively. The relative EMD, normalized with the maximal EMD for each subject, decreased dependent on the extent of decrease in MG tendon slack. There were no significant differences in EMD among the joint angles (-10, 0, and 5°) where MG tendon slack was taken up. These results suggest that the extent of tendon slack is an important factor for determining EMD.

Original languageEnglish
Pages (from-to)540-544
Number of pages5
JournalJournal of Applied Physiology
Volume96
Issue number2
DOIs
Publication statusPublished - 2004 Feb

Fingerprint

Tendons
Ankle Joint
Joints
Torque
Electric Stimulation
Ultrasonography
Muscles

Keywords

  • Ankle joint
  • Electrical stimulations
  • Force transmission capability
  • Ultrasonography

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo. / Muraoka, Tetsuro; Muramatsu, Tadashi; Fukunaga, Tetsuo; Kanehisa, Hiroaki.

In: Journal of Applied Physiology, Vol. 96, No. 2, 02.2004, p. 540-544.

Research output: Contribution to journalArticle

Muraoka, Tetsuro ; Muramatsu, Tadashi ; Fukunaga, Tetsuo ; Kanehisa, Hiroaki. / Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo. In: Journal of Applied Physiology. 2004 ; Vol. 96, No. 2. pp. 540-544.
@article{3a57cdbcd4854b7fbe72dda3a7e4e366,
title = "Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo",
abstract = "The purpose of this study was to clarify the influence of muscle-tendon complex stretch on electromechanical delay (EMD) in terms of the extent of tendon slack in the human medial gastrocnemius (MG). EMD and MG tendon length were measured at each of five ankle joint angles (-30, -20, -10, 0, and 5°: positive values for dorsiflexion) using percutaneous electrical stimulation and ultrasonography, respectively. The extent of MG tendon slack was calculated as MG tendon length shortening, standardized with MG tendon slack length obtained at the joint angle (-16° ± 5°) where the passive ankle joint torque was zero. EMD at -30° (19.2 ± 2.2 ms) and -20° (17.2 ± 1.3 ms) was significantly greater than that at -10° (16.0 ± 2.3 ms), 0° (15.0 ± 1.4 ms), and 5° (14.8 ± 1.4 ms), and at 0 and 5°, respectively. The relative EMD, normalized with the maximal EMD for each subject, decreased dependent on the extent of decrease in MG tendon slack. There were no significant differences in EMD among the joint angles (-10, 0, and 5°) where MG tendon slack was taken up. These results suggest that the extent of tendon slack is an important factor for determining EMD.",
keywords = "Ankle joint, Electrical stimulations, Force transmission capability, Ultrasonography",
author = "Tetsuro Muraoka and Tadashi Muramatsu and Tetsuo Fukunaga and Hiroaki Kanehisa",
year = "2004",
month = "2",
doi = "10.1152/japplphysiol.01015.2002",
language = "English",
volume = "96",
pages = "540--544",
journal = "Journal of Applied Physiology Respiratory Environmental and Exercise Physiology",
issn = "8750-7587",
publisher = "American Physiological Society",
number = "2",

}

TY - JOUR

T1 - Influence of tendon slack on electromechanical delay in the human medial gastrocnemius in vivo

AU - Muraoka, Tetsuro

AU - Muramatsu, Tadashi

AU - Fukunaga, Tetsuo

AU - Kanehisa, Hiroaki

PY - 2004/2

Y1 - 2004/2

N2 - The purpose of this study was to clarify the influence of muscle-tendon complex stretch on electromechanical delay (EMD) in terms of the extent of tendon slack in the human medial gastrocnemius (MG). EMD and MG tendon length were measured at each of five ankle joint angles (-30, -20, -10, 0, and 5°: positive values for dorsiflexion) using percutaneous electrical stimulation and ultrasonography, respectively. The extent of MG tendon slack was calculated as MG tendon length shortening, standardized with MG tendon slack length obtained at the joint angle (-16° ± 5°) where the passive ankle joint torque was zero. EMD at -30° (19.2 ± 2.2 ms) and -20° (17.2 ± 1.3 ms) was significantly greater than that at -10° (16.0 ± 2.3 ms), 0° (15.0 ± 1.4 ms), and 5° (14.8 ± 1.4 ms), and at 0 and 5°, respectively. The relative EMD, normalized with the maximal EMD for each subject, decreased dependent on the extent of decrease in MG tendon slack. There were no significant differences in EMD among the joint angles (-10, 0, and 5°) where MG tendon slack was taken up. These results suggest that the extent of tendon slack is an important factor for determining EMD.

AB - The purpose of this study was to clarify the influence of muscle-tendon complex stretch on electromechanical delay (EMD) in terms of the extent of tendon slack in the human medial gastrocnemius (MG). EMD and MG tendon length were measured at each of five ankle joint angles (-30, -20, -10, 0, and 5°: positive values for dorsiflexion) using percutaneous electrical stimulation and ultrasonography, respectively. The extent of MG tendon slack was calculated as MG tendon length shortening, standardized with MG tendon slack length obtained at the joint angle (-16° ± 5°) where the passive ankle joint torque was zero. EMD at -30° (19.2 ± 2.2 ms) and -20° (17.2 ± 1.3 ms) was significantly greater than that at -10° (16.0 ± 2.3 ms), 0° (15.0 ± 1.4 ms), and 5° (14.8 ± 1.4 ms), and at 0 and 5°, respectively. The relative EMD, normalized with the maximal EMD for each subject, decreased dependent on the extent of decrease in MG tendon slack. There were no significant differences in EMD among the joint angles (-10, 0, and 5°) where MG tendon slack was taken up. These results suggest that the extent of tendon slack is an important factor for determining EMD.

KW - Ankle joint

KW - Electrical stimulations

KW - Force transmission capability

KW - Ultrasonography

UR - http://www.scopus.com/inward/record.url?scp=0942276821&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0942276821&partnerID=8YFLogxK

U2 - 10.1152/japplphysiol.01015.2002

DO - 10.1152/japplphysiol.01015.2002

M3 - Article

C2 - 14527969

AN - SCOPUS:0942276821

VL - 96

SP - 540

EP - 544

JO - Journal of Applied Physiology Respiratory Environmental and Exercise Physiology

JF - Journal of Applied Physiology Respiratory Environmental and Exercise Physiology

SN - 8750-7587

IS - 2

ER -