Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Reduced short and long latency reflexes during voluntary tracking movementof the human wrist joint
Autore:
Bawa, P; Sinkjaer, T;
Indirizzi:
Univ Aalborg, Dept Med Informat & Image Anal, Ctr Sensory Motor Interact, DK-9220 Aalborg, Denmark Univ Aalborg Aalborg Denmark DK-9220 Interact, DK-9220 Aalborg, Denmark Simon Fraser Univ, Sch Kinesiol, Burnaby, BC V5A 1S6, Canada Simon Fraser Univ Burnaby BC Canada V5A 1S6 , Burnaby, BC V5A 1S6, Canada
Titolo Testata:
ACTA PHYSIOLOGICA SCANDINAVICA
fascicolo: 3, volume: 167, anno: 1999,
pagine: 241 - 246
SICI:
0001-6772(199911)167:3<241:RSALLR>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRETCH REFLEX; STIFFNESS; MODULATION;
Keywords:
H-reflex; human wrist; movement; short and long latency stretch reflexes; spindle unloading;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Sinkjaer, T Univ Aalborg, Dept Med Informat & Image Anal, Ctr Sensory Motor Interact, Fredrik Bajers Vej 7D-3, DK-9220 Aalborg, Denmark Univ Aalborg Fredrik Bajers Vej 7D-3 Aalborg Denmark DK-9220
Citazione:
P. Bawa e T. Sinkjaer, "Reduced short and long latency reflexes during voluntary tracking movementof the human wrist joint", ACT PHYSL S, 167(3), 1999, pp. 241-246

Abstract

In six healthy human subjects we compared changes in the strength of Hoffmann (H), short latency (30-55 ms) and long latency (55-100 ms) stretch reflexes of flexor carpi radialis (FCR) muscle during movement and isometric contractions. In one set of experiments, stretches were imposed to the wrist during voluntarily tracked sinusoidal movement and during matched isometriccontractions to compare short and long latency stretch reflex responses. In the second set, H-reflexes were compared during similar matched conditions. All reflexes decreased significantly (P < 0.05) during the voluntary tracking movement. The H-reflex was reduced during the wrist flexion, on average, by 33% of its value obtained during the isometric condition. Compared with their values during isometric conditions, the short latency stretch reflex and long latency stretch reflex during movement were reduced by 52 and 40%, respectively. From the pattern changes of the stretch reflexes and theH-reflex, a movement-induced presynaptic inhibition combined with pronounced muscle spindle unloading is proposed to play an important role in decreasing the strength of the stretch reflexes during the tracking task as compared with a matched isometric contraction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/21 alle ore 02:58:04