学術論文

基本情報

氏名 伊藤 雅充
氏名(カナ) イトウ マサミツ
氏名(英語) ITO Masamitsu

名称

In vivo estimation of contraction velocity of human vastus lateralis muscle during“isokinetic” action

単著・共著の別

共著

発表年月

2000/03

発表雑誌又は発表学会等の名称

J Appl Physiol 88(3)

概要

To determine the shortening velocities of fascicles of the vastus lateralis muscle (VL) during isokinetic knee 
extension, six male subjects were requested to extend the knee with maximal effort at angular velocities of 30 and 150 degrees/s. By using an ultrasonic apparatus, longitudinal images of the VL were produced every 30
ms during knee extension, and the fascicle length and angle of pennation were obtained from these images.
The shortening fascicle length with extension of the knee (from 98 to 13 degrees of knee angle;full extension =0 degrees) was greater (43 mm) at 30 degrees/s than at 150 degrees/s (35 mm). Even when the angular velocity remained constant during the isokinetic range of motion, the fascicle velocity was found to change from 39 to 77 mm/s at 150 degrees/s and from 6 to 19 mm/s at 30 degrees/s. The force exerted by a fascicle changed with the length of the fascicle at changing angular velocities. The peak values of fascicle force and 
velocity were observed at approximately 90 mm of fascicle length. In conclusion, even if the angular velocity of knee extension is kept constant, the shortening velocity of a fascicle is dependent on the force applied to the muscle-tendon complex, and the phenomenon is considered to be caused mainly by the elongation of the elastic element (tendinous tissue).

共著者

Ichinose,Y, Y.Kawakami, M.Ito,H.Kanehisa and Fukunaga T.

掲載ページ数

p.851~p.856 共同研究につき本人担当部分抽出不可能