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Titolo:
Influences of repetitive muscle contractions with different modes on tendon elasticity in vivo
Autore:
Kubo, K; Kanehisa, H; Kawakami, Y; Fukunaga, T;
Indirizzi:
Univ Tokyo, Dept Life Sci Sports Sci, Meguro Ku, Tokyo 1538902, Japan UnivTokyo Tokyo Japan 1538902 orts Sci, Meguro Ku, Tokyo 1538902, Japan
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 91, anno: 2001,
pagine: 277 - 282
SICI:
8750-7587(200107)91:1<277:IORMCW>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
KNEE EXTENSOR MUSCLES; ECCENTRIC EXERCISE; FATIGUE; STIFFNESS;
Keywords:
stiffness; damage; vastus lateralis muscle; ultrasonography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Kubo, K Univ Tokyo, Dept Life Sci Sports Sci, Meguro Ku, Komaba 3-8-1, Tokyo 1538902, Japan Univ Tokyo Komaba 3-8-1 Tokyo Japan 1538902 Tokyo 1538902, Japan
Citazione:
K. Kubo et al., "Influences of repetitive muscle contractions with different modes on tendon elasticity in vivo", J APP PHYSL, 91(1), 2001, pp. 277-282

Abstract

The present study aimed to investigate the effects of repetitive muscle contractions on the elasticity of human tendon structures in vivo. Before andafter each endurance test, the elongation of the tendon and aponeurosis ofvastus lateralis muscle (L) was directly measured by ultrasonography whilethe subjects performed ramp isometric knee extension up to maximal voluntary isometric contraction (MVC). Six male subjects performed muscle endurance tests that consisted of knee extension tasks with four different contraction modes: 1) 50 repetitions of maximal voluntary eccentric action for 3 s with 3 s of relaxation (ET1), 2) three sets of 50 repetitions of MVC for 1 s with 3 s of relaxation (ET2), 3) 50 repetitions of MVC for 3 s with 3 s of relaxation (ET3), and 4) 50 repetitions of 50% MVC for 6 s with 6 s of relaxation (ET4). In ET1 and ET2, there were no significant differences in L values at any force production levels between before and after endurance tests. In the cases of ET3 and ET4, however, the extent of elongation after the completion of the tests tended to be greater. The L values above 330 N in ET3 and 440 N in ET4, respectively, were significantly greater after endurance tests than before. These results suggested that the repeated longer duration contractions would make the tendon structures more compliant and that the changes in the elasticity might be not be affected by either muscle action mode or force production level but by the duration of action.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 13:38:52