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Titolo:
Reduced strength after passive stretch of the human plantarflexors
Autore:
Fowles, JR; Sale, DG; MacDougall, JD;
Indirizzi:
McMaster Univ, Dept Kinesiol, Ivor Wynne Ctr, Hamilton, ON L8S 4K1, CanadaMcMaster Univ Hamilton ON Canada L8S 4K1 tr, Hamilton, ON L8S 4K1, Canada
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 3, volume: 89, anno: 2000,
pagine: 1179 - 1188
SICI:
8750-7587(200009)89:3<1179:RSAPSO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; CONTRACTILE PROPERTIES; ANKLE DORSIFLEXION; TRICEPS SURAE; TENDON; EXERCISE; GASTROCNEMIUS; ELASTICITY; RESPONSES; FATIGUE;
Keywords:
isometric; motor unit activation; stiffness; viscoelastic;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Sale, DG McMaster Univ, Dept Kinesiol, Ivor Wynne Ctr, Rm AB118, Hamilton,ON L8S 4K1, Canada McMaster Univ Rm AB118 Hamilton ON Canada L8S 4K1 L8S 4K1, Canada
Citazione:
J.R. Fowles et al., "Reduced strength after passive stretch of the human plantarflexors", J APP PHYSL, 89(3), 2000, pp. 1179-1188

Abstract

The purpose of this study was to assess strength performance after an acute bout of maximally tolerable passive stretch (PSmax) in human subjects. Ten young adults (6 men and 4 women) underwent 30 min of cyclical PSmax (13 stretches of 135 s each over 33 min) and a similar control period (Con) of no stretch of the ankle plantarflexors. Measures of isometric strength (maximal voluntary contraction), with twitch interpolation and electromyography,and twitch characteristics were assessed before (Pre), immediately after (Post), and at 5, 15, 30, 45, and 60 min after PSmax or Con. Compared with Pre, maximal voluntary contraction was decreased at Post (28%) and at 5 (21%), 15 (13%), 30 (12%), 45 (10%), and 60 (9%) min after PSmax (P < 0.05). Motor unit activation and electromyogram were significantly depressed after PSmax but had recovered by 15 min. An additional testing trial confirmed that the torque-joint angle relation may have been temporarily altered, but atPost only. These data indicate that prolonged stretching of a single muscle decreases voluntary strength for up to 1 h after the stretch as a result of impaired activation and contractile force in the early phase of deficit and by impaired contractile force throughout the entire period of deficit.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:48:20