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Titolo:
Magnitude and decay of stretch-induced enhancement of power output
Autore:
Cronin, JB; McNair, PJ; Marshall, RN;
Indirizzi:
Auckland Univ Technol, Sport Performance Ctr, Auckland 1020, New Zealand Auckland Univ Technol Auckland New Zealand 1020 ckland 1020, New Zealand Auckland Univ Technol, Sch Physiotherapy, Neuromuscular Res Unit, Auckland1020, New Zealand Auckland Univ Technol Auckland New Zealand 1020 uckland1020, New Zealand Univ Auckland, Dept Exercise & Sport Sci, Auckland 1, New Zealand Univ Auckland Auckland New Zealand 1 Sport Sci, Auckland 1, New Zealand
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 84, anno: 2001,
pagine: 575 - 581
SICI:
1439-6319(200106)84:6<575:MADOSE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEG EXTENSOR MUSCLES; ELASTIC ENERGY; SHORTENING CYCLE; FORCE ENHANCEMENT; SKELETAL-MUSCLE; EXERCISE; PERFORMANCE; MOVEMENTS; EFFICIENCY; STORAGE;
Keywords:
bench press; concentric; stretch-shorten cycle;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Cronin, JB Auckland Univ Technol, Sport Performance Ctr, Private Bag 92006, Auckland 1020, New Zealand Auckland Univ Technol Private Bag 92006 Auckland New Zealand 1020
Citazione:
J.B. Cronin et al., "Magnitude and decay of stretch-induced enhancement of power output", EUR J A PHY, 84(6), 2001, pp. 575-581

Abstract

There is ample evidence that the pre-stretching of a muscle enhances performance of the subsequent shortening or concentric contraction. The purpose of this study was to investigate this stretch-induced enhancement in terms of the effect of load on the magnitude and decay of the muscle's power output. Instantaneous, mean and peak power outputs were compared between concentric-only and rebound bench press throws at different loads. The maximal strength [1 RM = 84.0 (10.5) kg] of 18 male subjects [21.1 (3.0) years, 87.2 (11.9) kg] was determined using an isoinertial Smith press machine. The results of this study indicate enhancement of concentric motion by prior eccentric muscle action (200-780% enhancement in the first 100 ms). However, themagnitude and temporal characteristics of this enhancement differed acrossloads. Using a lighter load produced greater initial enhancement (P < 0.05) but the decay of this enhancement was more rapid. The heavier 80% 1 RM loading showed a later time to peak enhancement (80 ms versus 20 ms) and slower decay of the stretch induced augmentation (460 ms versus 260 ms). It is concluded that the degree of stretch-shorten cycle enhancement differs according to the load and the time-dependent characteristics of the motion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 01:49:17