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2010-12-21 - Article/Dans un journal avec peer-review - Anglais - 12 page(s)

Bengoetxea A., Dan B., Leurs F., Cebolla A.M., De Saedeleer C., Gillis Pierre , Cheron Guy , "Rhythmic muscular activation pattern for fast figure-eight movement" in Clinical Neurophysiology, 121, 754-765

  • Edition : Elsevier (Netherlands)
  • Codes CREF : Neurophysiologie (DI3224)
  • Unités de recherche UMONS : Physique biomédicale (M104), Electrophysiologie (P310)
Texte intégral :

Abstract(s) :

(Anglais) ABSTRACT Objective: To address the question of how the CNS generates muscle activation patterns for complex gestures, we have chosen to study a figure-eight movement. We hypothesized that the well defined rhythmic aspect of this figure will provide further insights into the temporal features of multi-muscular commands. Methods: Subjects performed, as fast as possible, figure-eights initiated in the center of the figure with 4 different initial directions and 2 positions of the shoulder. We extracted the temporal modulation of the EMG patterns by calculating conjugate cross-correlation functions. Results: (1) The muscular command was tuned with respect to the rotational direction of the figure-eight, (2) two sets of synergistic muscles acted in a reciprocal mode, and (3) these reciprocal commands presented an invariant temporal correlation with the spatial component of the velocity having the highest frequency. Conclusion: our results suggest that the rhythmic features of certain drawing movements favour the partitioning of the muscles into synergistic groups acting in a reciprocal mode. The inclusion of an individual muscle in one group or the other takes into account the expected number of changes of direction in the movement as a whole. Significance: Muscular temporal synergies may depend on the rhythmic features of the trajectory.