Nonisometric behavior of fascicles during isometric contractions of a human muscle

Masamitsu Ito, Yasuo Kawakami, Yoshiho Ichinose, Senshi Fukashiro, Tetsuo Fukunaga

研究成果: Article

179 被引用数 (Scopus)

抄録

Fascicle length, pennation angle, and tendon elongation of the human tibialis anterior were measured in vivo by ultrasonography. Subjects (n = 9) were requested to develop isometric dorsiflexion torque gradually up to maximal at the ankle joint angle of 20°plantarflexion from the anatomic position. Fascicle length shortened from 90 ± 7 to 76 ± 7 (SE) mm, pennation angle increased from 10 ± 1 to 12 ± 1°, and tendon elongation increased up to 15 ± 2 mm with graded force development up to maximum. The tendon stiffness increased with increasing tendon force from 10 N/mm at 0-20 N to 32 N/mm at 240-260 N. Young's modulus increased from 157 MPa at 0-20 N to 530 MPa at 240-260 N. It can be concluded that, in isometric contractions of a human muscle, mechanical work, some of which is absorbed by the tendinous tissue, is generated by the shortening of muscle fibers and that ultrasonography can be used to determine the stiffness and Young's modulus for human tendons.

本文言語English
ページ(範囲)1230-1235
ページ数6
ジャーナルJournal of Applied Physiology
85
4
出版ステータスPublished - 1998 10 1
外部発表はい

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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