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J Mot Behav. 2006 Jan;38(1):7-14.

Neuromuscular-skeletal origins of predominant patterns of coordination in rhythmic two-joint arm movement.

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Perception and Motor Systems Laboratory, School of Human Movement Studies, Room, 424, The University of Queensland, Brisbane, QLD 424, Australia.


The authors tested for predominant patterns of coordination in the combination of rhythmic flexion-extension (FE) and supination- (SP) at the elbow-joint complex. Participants (N=10) spontaneously established in-phase (supination synchronized with flexion) and antiphase (pronation synchronized with flexion) patterns. In addition, the authors used a motorized robot arm to generate involuntary SP movements with different phase relations with respect to voluntary FE. The involuntarily induced in-phase pattern was accentuated and was more consistent than other patterns. The result provides evidence that the predominance of the in-phase pattern originates in the influence of neuromuscular-skeletal constraints rather than in a preference dictated by perceptual-cognitive factors implicated in voluntary control. Neuromuscular-skeletal constraints involved in the predominance of the in-phase and the antiphase patterns are discussed.

[Indexed for MEDLINE]

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