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Titolo:
Behavior of fascicles and tendinous structures of human gastrocnemius during vertical jumping
Autore:
Kurokawa, S; Fukunaga, T; Fukashiro, S;
Indirizzi:
Univ Tokyo, Dept Life Sci Sports Sci, Tokyo 1538902, Japan Univ Tokyo Tokyo Japan 1538902 Life Sci Sports Sci, Tokyo 1538902, Japan
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 4, volume: 90, anno: 2001,
pagine: 1349 - 1358
SICI:
8750-7587(200104)90:4<1349:BOFATS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MUSCLE-TENDON COMPLEX; ELASTIC STRAIN-ENERGY; MECHANICAL-PROPERTIES; IN-VIVO; MEDIAL GASTROCNEMIUS; SKELETAL-MUSCLE; HUMAN MOVEMENT; STORAGE; WORK; BIOMECHANICS;
Keywords:
ultrasonography; compliance; elastic energy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Fukashiro, S Univ Tokyo, Dept Life Sci Sports Sci, Komaba 3-8-1, Tokyo 1538902, Japan Univ Tokyo Komaba 3-8-1 Tokyo Japan 1538902 o 1538902, Japan
Citazione:
S. Kurokawa et al., "Behavior of fascicles and tendinous structures of human gastrocnemius during vertical jumping", J APP PHYSL, 90(4), 2001, pp. 1349-1358

Abstract

Behavior of fascicles and tendinous structures of human gastrocnemius medialis (MG) was determined by use of ultrasonography in vivo during jumping. Eight male subjects jumped vertically without countermovement (squat jump, SQJ). Simultaneously, kinematics, kinetics, and electromyography from lowerleg muscles were recorded during SQJ. During phase 1 (-350 to -100 ms before toe-off, muscle-tendon complex (MTC) length was almost constant. Fascicles, however, shortened by 26%, and tendinous structures were stretched by 6%, storing elastic energy of 4.9 J during phase I. During phase II(-100 ms to toe-off), although fascicles generated force quasi-isometrically, MTC shortened rapidly by 5.3%, releasing prestored elastic energy with a higher peak positive power than that of fascicles. Also, the compliance of tendinous structures in vivo was somewhat higher than that of external tendon used in the simulation studies. The results demonstrate that the compliance of tendinous structures, together with no yielding of muscle fibers, allows MTCto effectively generate relatively large power at a high joint angular velocity region during the last part of push-off.

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Documento generato il 07/04/20 alle ore 22:55:53