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Titolo:
Activation of human quadriceps femoris muscle during dynamic contractions:effects of load on fatigue
Autore:
Lee, SCK; Becker, CN; Binder-Macleod, SA;
Indirizzi:
Univ Delaware, Dept Phys Therapy, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 Dept Phys Therapy, Newark, DE 19716 USA Univ Penn, Dept Rehabil Med, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 habil Med, Philadelphia, PA 19104 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 3, volume: 89, anno: 2000,
pagine: 926 - 936
SICI:
8750-7587(200009)89:3<926:AOHQFM>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; MEDIAL GASTROCNEMIUS-MUSCLE; CATCH-LIKE PROPERTY; SINGLE MOTOR UNITS; POWER OUTPUT; ISOTONIC CONTRACTIONS; HUMAN VOLUNTARY; STIMULATION; FREQUENCY; TRAINS;
Keywords:
catchlike property; shortening; functional electrical stimulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Binder-Macleod, SA Univ Delaware, Dept Phys Therapy, 303 McKinly Lab, Newark, DE 19716 USA Univ Delaware 303 McKinly Lab Newark DE USA 19716 6 USA
Citazione:
S.C.K. Lee et al., "Activation of human quadriceps femoris muscle during dynamic contractions:effects of load on fatigue", J APP PHYSL, 89(3), 2000, pp. 926-936

Abstract

Muscle fatigue is both multifactorial and task dependent. Electrical stimulation may assist individuals with paralysis to perform functional activities [functional electrical stimulation (FES), e.g., standing or walking], but muscle fatigue is a limiting factor. One method of optimizing force is touse stimulation patterns that exploit the catchlike property of skeletal muscle [catchlike-inducing trains (CITs)]. Although nonisometric (dynamic) contractions are important parts of both normal physiological activation of skeletal muscles and FES, no previous studies have attempted to identify the effect that the load being lifted by a muscle has on the fatigue produced. This study examined the effects of load on fatigue during dynamic contractions and the augmentation produced by CITs as a function of load. Knee extension in healthy subjects was electrically elicited against three different loads. The highest load produced the least excursion, work, and average power, but it produced the greatest fatigue. CIT augmentation was greatest at the highest load and increased with fatigue. Because CITs were effective during shortening contractions for a variety of loads, they may be of benefit during FES applications.

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Documento generato il 04/04/20 alle ore 08:57:46