RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Horizontal plane head stabilization during locomotor tasks

Auteur(s) / Author(s)

CROMWELL Ronita L. (1) ; NEWTON Roberta A. (2) ; CARLTON Les G. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Physical Therapy, University of Texas Medical Branch, ETATS-UNIS
(2) Physical Therapy Department, Temple University, ETATS-UNIS
(3) Department of Kinesiology, University of Illinois at Urbana-Champaign, ETATS-UNIS

Résumé / Abstract

Frequency characteristics of head stabilization were examined during locomotor tasks in healthy young adults (N = 8) who performed normal walking and 3 walking tasks designed to produce perturbations primarily in the horizontal plane. In the 3 walking tasks, the arms moved in phase with leg movement, with abnormally large amplitude, and at twice the frequency of leg movement. Head-in-space angular velocity was examined at the predominant frequencies of trunk motion. Head movements in space occurred at low frequencies (<4.0 Hz) in all conditions and at higher frequencies (> 4.0 Hz) when the arms moved at twice the frequency of the legs. Head stabilization strategies were determined from head-on-trunk with respect to trunk frequency profiles derived from angular velocity data. During natural walking at low frequencies (< 3.0 Hz), head-on-trunk movement was less than trunk movement, At frequencies 3.0 Hz or greater, equal and opposite compensatory movement ensured head stability. When arm swing was altered, compensatory movement guaranteed head stability at all frequencies. Head stabilization was successful for frequencies up to 10.0 Hz during locomotor tasks. Maintaining head stability at high frequencies during voluntary tasks suggests that participants used feedforward mechanisms to coordinate head and trunk movements, Maintenance of head stability during dynamic tasks allows optimal conditions for vestibulo-ocular reflex function.

Revue / Journal Title

Journal of motor behavior    ISSN  0022-2895   CODEN JMTBAB 

Source / Source

2001, vol. 33, no1, pp. 49-58 (28 ref.)

Langue / Language

Anglais

Editeur / Publisher

Heldref, Washington, DC, ETATS-UNIS  (1969) (Revue)

Mots-clés anglais / English Keywords

Experimental study

;

Locomotion

;

Coordination

;

Vestibular system

;

Equilibrium

;

Stabilization

;

Head

;

Motricity

;

Human

;

Mots-clés français / French Keywords

Etude expérimentale

;

Locomotion

;

Coordination

;

Système vestibulaire

;

Equilibre

;

Stabilisation

;

Tête

;

Motricité

;

Homme

;

Mots-clés espagnols / Spanish Keywords

Estudio experimental

;

Locomoción

;

Coordinación

;

Sistema vestibular

;

Equilibrio

;

Estabilización

;

Cabeza

;

Motricidad

;

Hombre

;

Localisation / Location

INIST-CNRS, Cote INIST : 20635, 35400009869497.0060

Nº notice refdoc (ud4) : 942566



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas