Cross-correlation analysis of the lateral hip strategy in unperturbed stance.
Subjects standing heel-to-toe on either hard ground or soft support were instructed to stand upright keeping optimal balance. Lateral accelerometric measurements at head, hip and ankle levels were subjected to conjugate cross-correlations analysis in order to determine the co-ordinated movements or strategies. The results strongly suggest that there exists a hip lateral strategy which is very similar to the hip strategy previously described in fore-aft body oscillations. This lateral hip strategy was only observed when the greatest body oscillations were observed, namely on the soft supporting surface, and its descending sequence of co-ordinated movements is consistent with the idea of a top-down organization of postural control during movement or difficult stance conditions.
Lekhel
H
H
Laboratoire de Neurobiologie et Mouvements, CNRS, Marseille, France.
Marchand
A R
AR
Assaiante
C
C
Crémieux
J
J
Amblard
B
B
D000054:Acceleration; D000328:Adult; D000842:Ankle / Q000502:physiology; D005260:Female; D006615:Hip / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*