Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Is passive stiffness in human muscles related to the elasticity of tendon structures?
Autore:
Kubo, K; Kanchisa, H; 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:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 3-4, volume: 85, anno: 2001,
pagine: 226 - 232
SICI:
1439-6319(200108)85:3-4<226:IPSIHM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-SECTIONAL AREA; VOLUNTARY STRENGTH; SHORT HAMSTRINGS; PLANTAR FLEXORS; WOMEN; FLEXIBILITY; LENGTH; MEN; STRETCH; ANKLE;
Keywords:
passive torque-angle curve; muscle and tendon stiffness; plantar flexor muscle; ultrasonography; stretch-shortening cycle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
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., "Is passive stiffness in human muscles related to the elasticity of tendon structures?", EUR J A PHY, 85(3-4), 2001, pp. 226-232

Abstract

The purpose of this study was to examine in vivo whether passive stiffnessin human muscles was related to the elasticity of tendon structures and toperformance during stretch-shortening cycle exercise. Passive torque of plantar flexor muscles was measured during passive stretch from 90 degrees (anatomical position) to 65 degrees of dorsiflexion at a constant velocity of5 degrees .s(-1). The slope of the linear portion of the passive torque-angle curve during stretching was defined as the passive stiffness of the muscle. The elongation of the tendon and aponeurosis of the medial gastrocnemius muscle (MG) was directly measured using ultrasonography during ramp isometric plantar flexion up to the voluntary maximum. The relationship betweenthe estimated muscle force of MG and tendon elongation was fitted to a linear regression, the slope of which was defined as the stiffness of the tendon. In addition, the dynamic torques during maximal voluntary concentric plantar flexion with and without prior eccentric contraction were determined at a constant velocity of 120 degrees .s(-1). There were no significant correlations between passive stiffness and either the tendon stiffness (r=0.19, P>0.05) or the relative increase in torque with prior eccentric contraction (r=-0.19, P>0.05). However, tendon stiffness was negatively correlated to the relative increase in torque output (r=-0.42, P<0.05). The present results suggested that passive stiffness was independent of the elasticity of tendon structures, and had no favourable effect on the muscle performance during stretch-shortening cycle exercise.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 12:19:18