title: Interplay of biomechanical and neuromuscular constraints on pattern stability and attentional demands in a bimanual coordination task in human subjects.
abstract: Recent debate has focused upon the issue of whether general principles and laws of movement coordination may be derived without reference to anatomical, mechanical and physiological mechanisms. It has been proposed that self-generated movement involves the interaction of biomechanical and neuromuscular constraints. Biomechanical constraints are usually considered of as arising from the pendular dimensions of the limb or limb segments whereas neuromuscular constraints are commonly associated with nervous and metabolic control processes. The present study aims to investigate the interplay between these two different constraints on bimanual pattern stability and attentional demands. Five subjects were asked to execute an anti-phase coordination pattern (180 degrees of relative phase), while gradually increasing the frequency of oscillation and changing the rotational inertia of the joysticks. Frequency manipulation was expected to affect the neuromuscular constraints. Inertial manipulation was expected to affect biomechanical constraints. Attentional demands, reflecting the central cost associated with the maintenance of the coordination pattern was assessed using a dual-task paradigm. The results showed that: (1) increasing the oscillation frequency altered both coordination dynamics and attentional demands associated with the maintenance of bimanual coordination patterns; (2) manipulation of rotational inertia of the joysticks also altered pattern stability (standard deviation of relative phase) and coordination dynamics (i.e. the number of phase transition and the before transition), but these alterations were not paralleled by a change in attentional demands.
authors: UMR 6559 'Movement and Perception', University of the Mediterranean and CNRS, Faculty of Sport Sciences, 163 Avenue de Luminy, case postale 910, 13009, Marseille, France. temprado@laps.univ-mrs.fr
authors: J J
authors: JJ
authors: Temprado
authors: A
authors: A
authors: Chardenon
authors: M
authors: M
authors: Laurent
mesh_terms: D000322:Adrenergic Agonists / Q000494:pharmacology*; D001288:Attention / Q000502:physiology*; D001696:Biomechanical Phenomena; D002490:Central Nervous System / Q000502:physiology*; D005121:Extremities / Q000294:innervation / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008959:Models, Neurological; D009048:Motor Skills / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D009483:Neuropsychological Tests; D017711:Nonlinear Dynamics
chemical_list: D000322:Adrenergic Agonists