Length change of human gastrocnemius aponeurosis and tendon during passive joint motion

Tetsuro Muraoka*, Tadashi Muramatsu, Daisuke Takeshita, Yasuo Kawakami, Tetsuo Fukunaga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


The extent of elongation and slackness of aponeurosis and tendon, and muscle fiber length of human medial gastrocnemius muscle are determined in vivo using ultrasonography. The ankle joint is passively moved at 5°/s within the joint range of -36 to 7° (0° = neutral anatomic position; positive values for dorsiflexion) by a dynamometer while the length change of the aponeurosis and tendon is determined using ultrasonography (n = 8 men). Strain is calculated as the length change relative to the reference length of aponeurosis and tendon when the passive joint moment is 0. Elongation (positive strain values) of aponeurosis and tendon at 7° are 2.1 ± 1.1 and 2.4 ± 1.0%, respectively. The extent of slackness (negative strain values) of aponeurosis and tendon at -36° are -1.8 ± 1.1 and -3.5 ± 1.6%, respectively, and there is a significant difference between them (p < 0.05). This may be related to the existence of muscle fibers that attach to the aponeurosis over its whole length and do not allow it to fold. The results indicate that the length change of aponeurosis and tendon of medial gastrocnemius muscle occurs over the range of ankle joint positions even during passive joint motions.

Original languageEnglish
Pages (from-to)260-268
Number of pages9
JournalCells Tissues Organs
Issue number4
Publication statusPublished - 2002 Sept 2
Externally publishedYes


  • Ankle
  • Aponeurosis, slackness
  • Strain

ASJC Scopus subject areas

  • Anatomy
  • Histology


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