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Titolo:
Elastic properties of muscle-tendon complex in long-distance runners
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:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY
fascicolo: 3, volume: 81, anno: 2000,
pagine: 181 - 187
SICI:
0301-5548(200002)81:3<181:EPOMCI>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-SECTIONAL AREA; ISOKINETIC EXERCISE; VOLUNTARY STRENGTH; FIBER COMPOSITION; EXTENSOR MUSCLES; IN-VIVO; STIFFNESS; ENERGY; LENGTH; KNEE;
Keywords:
vastus lateralis muscle; compliance; ultrasonography; elastic energy utilization; endurance training;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Fukunaga, T 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 yo 1538902, Japan
Citazione:
K. Kubo et al., "Elastic properties of muscle-tendon complex in long-distance runners", EUR J A PHY, 81(3), 2000, pp. 181-187

Abstract

The purpose of this study was to investigate the elastic properties of muscle-tendon complex (MTC) in knee extensor muscles and the capacity for elastic energy utilization in long-distance runners (LDR) by comparing with data obtained from untrained individuals (CON). The elongation (L) of the tendon and aponeurosis of vastus lateralis muscle during isometric knee extension was determined by real-time brightness mode ultrasonography, while the subjects developed a gradually increasing torque from 0 (relaxed) to maximaleffort (MVC) within 7 s. In addition, performances in two kinds of maximalvertical jumps, i.e. squatting (SJ) and counter-movement jumps (CMJ), weremeasured. The relationship between L muscle and force (F) was curvilinear and consisted of an initial region (toe region), characterized by a large increase in L with increasing F, immediately followed by a linear region. The slope of the regression equation for the L-F relationship in the range 50%-100%, of MVC was defined as an index of MTC compliance, where the rate ofthe changes in L to that in muscle Fat every 10% of MVC became almost constant. The maximal L (L-max) and MTC compliance were significantly lower in LDR than in CON: 29.9 (SD 3.9) mm in LDR compared to 33.3 (SD 5.5) mm in CON for L-max and 1.55 (SD 0.25) x 10(-2) mm . N-1 in LDR compared to 1.88 (SD 0.82) x 10(-2) mm . N-1 in CON for MTC compliance. Also, LDR showed significantly less elastic energy absorption (E-e) than CON, defined as the areabelow the L-F relationship curve from 0 to 100% of MVC. Not only jump heights but also the differences between the heights in SJ and CMJ, expressed as the percentage of the height in SJ, were significantly lower in LDR than in CON. The augmentation with countermovement was significantly correlated to either MTC compliance (r = 0.554, P < 0.05) or E-e (r = 0.563, P < 0.05). Thus, the present results would indicate that MTC of vastus lateralis muscle is less compliant and its potential for energy storage during MTS lengthening is lower in LDR than untrained individuals. These elastic profiles of vastus lateralis muscle in LDR may be associated with their lower performances during CMJ.

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Documento generato il 03/07/20 alle ore 01:03:20