title: Dynamic dominance persists during unsupported reaching.
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.
authors.affiliation: Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.
authors.forename: Tucker
authors.initials: T
authors.lastname: Tomlinson
authors.forename: Robert
authors.initials: R
authors.lastname: Sainburg
mesh_terms: D000328:Adult; D001132:Arm / Q000502:physiology*; D001696:Biomechanical Phenomena; D004551:Elbow Joint; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006112:Gravitation; D006801:Humans; D007700:Kinetics; D008297:Male; D009068:Movement; D011597:Psychomotor Performance / Q000502:physiology*; D012984:Software; D055815:Young Adult