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Titolo:
Severity of contraction-induced injury is affected by velocity only duringstretches of large strain
Autore:
Brooks, SV; Faulkner, JA;
Indirizzi:
Univ Michigan, Inst Gerontol, Dept Physiol, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 ept Physiol, Ann Arbor, MI 48109 USA Univ Michigan, Inst Gerontol, Dept Biomed Engn, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 Biomed Engn, Ann Arbor, MI 48109 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 2, volume: 91, anno: 2001,
pagine: 661 - 666
SICI:
8750-7587(200108)91:2<661:SOCIIA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT SOLEUS MUSCLE; SKELETAL-MUSCLE; ECCENTRIC CONTRACTIONS; LENGTHENING CONTRACTIONS; MECHANICAL-PROPERTIES; EXERCISE; FAILURE; FIBERS; DAMAGE; DISRUPTION;
Keywords:
mice; damage; force deficit; lengthening;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Brooks, SV Univ Michigan, Inst Gerontol, Dept Physiol, 300 N Ingalls Bldg,Ann Arbor,MI 48109 USA Univ Michigan 300 N Ingalls Bldg Ann Arbor MI USA 48109 109 USA
Citazione:
S.V. Brooks e J.A. Faulkner, "Severity of contraction-induced injury is affected by velocity only duringstretches of large strain", J APP PHYSL, 91(2), 2001, pp. 661-666

Abstract

Our purpose was to investigate the effect of velocity of stretch on contraction-induced injury to whole skeletal muscles. Single stretches provide aneffective method for studying factors that initiate contraction-induced injury. We tested the null hypothesis that the severity of injury is not dependent on the velocity of the stretch. From the plateau of maximum isometriccontractions, extensor digitorum longus muscles of mice were administered single stretches in situ of 30-50% strain relative to muscle fiber length (L-f) at rates of 1-16 L-f/s. The magnitude of injury was represented by theisometric force deficit 1-10 min after the stretch. Although the null hypothesis was not supported because the force deficit was affected by velocity(r(2) = 0.09), the effect was relatively weak and was not significant except at the largest strain. Velocity had no effect on peak or average force or work input, factors established to have significant relationships with the force deficit. Velocity may play a minor role in contraction-induced injury, but its importance is negligible relative to that of strain.

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Documento generato il 29/02/20 alle ore 14:55:19