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Titolo:
Widespread short-latency stretch reflexes and their modulation during stumbling over obstacles
Autore:
Schillings, AM; Van Wezel, BMH; Mulder, T; Duysens, J;
Indirizzi:
CatholicrlandsNijmegen, Dept Med Phys & Biophys, NL-6525 EZ Nijmegen, Nethe Catholic Univ Nijmegen Nijmegen Netherlands NL-6525 EZ Z Nijmegen, Nethe St Maartensklin Res, NL-6522 JV Nijmegen, Netherlands St Maartensklin ResNijmegen Netherlands NL-6522 JV ijmegen, Netherlands Univ Nijmegen Hosp, Inst Neurol, NL-6500 HB Nijmegen, Netherlands Univ Nijmegen Hosp Nijmegen Netherlands NL-6500 HB Nijmegen, Netherlands
Titolo Testata:
BRAIN RESEARCH
fascicolo: 2, volume: 816, anno: 1999,
pagine: 480 - 486
SICI:
0006-8993(19990123)816:2<480:WSSRAT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLEUS H-REFLEX; SWING PHASE; ELECTROMYOGRAPHIC RESPONSES; AMPLITUDE-MODULATION; HUMAN WALKING; HUMAN GAIT; MUSCLE; ANKLE; JERK; COMPENSATION;
Keywords:
human gait; stumbling; short-latency stretch reflex; phase-dependent reflex modulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Schillings, AM Catholic525iv Nijmegen, Dept Med Phys & Biophys, Geert Grooteplein 21, NL-6 Catholic Univ Nijmegen Geert Grooteplein 21 Nijmegen Netherlands NL-6525 EZ
Citazione:
A.M. Schillings et al., "Widespread short-latency stretch reflexes and their modulation during stumbling over obstacles", BRAIN RES, 816(2), 1999, pp. 480-486

Abstract

The present study investigated whether short-latency stretch reflexes are present during human stumbling reactions, While subjects walked on a treadmill, the forward sway of the foot was unexpectedly obstructed with an obstacle. All subjects showed reflex responses with average latencies of 34-42 ms in both the upper and the lower leg flexors and extensors of the obstructed leg. The amplitudes of these responses depended on the phase in the stepcycle and were not strictly related to either the background activity of the corresponding muscles or variations in the perturbation. Hence, mechanisms at a premotoneuronal level might play a role in the active phase-dependent control of these responses. The coactivation of antagonists as well as the lack of obvious kinesiologic consequences following the responses suggest that the short-latency responses may generate joint stiffness. This may be a first line of defense: in preparing for the functional reaction,which is generated by longer latency responses, in order to take appropriate action concerning the obstacle. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 27/01/21 alle ore 02:11:11