The contraction-induced increase in Achilles tendon moment arm: A three-dimensional study

Satoru Hashizume, Soichiro Iwanuma, Ryota Akagi, Hiroaki Kanehisa, Yasuo Kawakami, Toshimasa Yanai

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The present study aimed to re-examine the influence of the isometric plantarflexors contraction on the Achilles tendon moment arm (ATMA) and the factors influencing the ATMA in three-dimensions. A series of coronal magnetic resonance images of the right ankle were recorded at foot positions of 10° of dorsiflexion, neutral position, and 10° of plantarflexion for the rest condition and the plantarflexors contraction condition at 30% maximal voluntary effort. The shortest distance between the talocrural joint axis and the line of action of the Achilles tendon force projected to the orthogonal plane of the talocrural joint axis was determined as the ATMA. The ATMA determined in the contraction condition was significantly greater by 8 mm than that determined in the rest condition. The talocrural joint axis was displaced anteriorly by 3 mm and distally by 2 mm due to the muscle contraction. As the same time, the line of action of the Achilles tendon force was displaced posteriorly by 5 mm and medially by 2 mm. These linear displacements of the talocrural joint axis and the line of action of the Achilles tendon force accounted for the difference in the ATMAs between the two conditions by 35.9 and 62.4%, respectively. These angular displacements accounted for the total of 0.4% increase in the ATMA. These results confirm the previous findings reported in two-dimensional studies and found that the linear displacement of the line of action of the Achilles tendon force is the primary source of the contraction-induced increase in the ATMA.

Original languageEnglish
Pages (from-to)3226-3231
Number of pages6
JournalJournal of Biomechanics
Volume47
Issue number12
DOIs
Publication statusPublished - 2014 Sep 22

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Tendons
Magnetic resonance
Muscle

Keywords

  • Finite helical axis
  • Muscle contraction
  • Musculoskeletal model
  • Talocrural joint
  • Triceps surae

ASJC Scopus subject areas

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

Cite this

The contraction-induced increase in Achilles tendon moment arm : A three-dimensional study. / Hashizume, Satoru; Iwanuma, Soichiro; Akagi, Ryota; Kanehisa, Hiroaki; Kawakami, Yasuo; Yanai, Toshimasa.

In: Journal of Biomechanics, Vol. 47, No. 12, 22.09.2014, p. 3226-3231.

Research output: Contribution to journalArticle

Hashizume, Satoru ; Iwanuma, Soichiro ; Akagi, Ryota ; Kanehisa, Hiroaki ; Kawakami, Yasuo ; Yanai, Toshimasa. / The contraction-induced increase in Achilles tendon moment arm : A three-dimensional study. In: Journal of Biomechanics. 2014 ; Vol. 47, No. 12. pp. 3226-3231.
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