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Research Articles

Dynamic Dominance Persists During Unsupported Reaching

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Pages 13-25 | Received 02 Sep 2011, Accepted 26 Oct 2011, Published online: 21 Dec 2011
 

ABSTRACT

Previous studies examining lateralization of arm movements focused on supported movements in the horizontal plane, removing the effects of gravity. The authors hypothesized that interlimb differences in free reaching would be consistent with the differences shown during supported reaching. Kinematic and kinetic data were collected for the forearm and upper arm segments in a 3-direction reaching task. Results showed lateralization of coordination, reflected by initial movement direction and trajectory curvature. The nondominant arm showed increased initial direction errors, and path curvature associated with a timing deficit between elbow and shoulder peak torques. These coordination deficits did not disrupt final position accuracy. The authors conclude that nondominant arm coordination deficits are similar to those reported previously for horizontal plane movements.

ACKNOWLEDGMENTS

This research was supported by National Institute of Child Health and Human Development Grant R01 HD 39311.

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