title: Intra-task variability of trunk coordination during a rate-controlled bipedal dance jump.
abstract: In this study, we investigated trunk coordination during rate-controlled bipedal vertical dance jumps. The aims of the study were to investigate the pattern of coordination and the magnitude of coordination variability within jump phases and relative to phase-defining events during the jump. Lumbar and thoracic kinematics were collected from seven dancers during a series of jumps at 95 beats per minute. The vector coding technique was used to quantify the pattern and variability of trunk coordination. Coordination was predominantly anti-phase during propulsion and landing. Mean coordination variability peaked just before the landing phase and at the transition from landing to propulsion phases, and was lowest during the propulsion phase just before toe-off. The results indicate that peaks in variability could be explained by task and phase-specific biomechanical demands.
authors: Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California 90089, USA. joannesm@usc.edu
authors: Jo Armour
authors: JA
authors: Smith
authors: Adam
authors: A
authors: Siemienski
authors: John M
authors: JM
authors: Popovich
authors: Kornelia
authors: K
authors: Kulig
mesh_terms: D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D003615:Dancing / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009048:Motor Skills; D009068:Movement; D013647:Task Performance and Analysis; D060726:Torso / Q000502:physiology*; D055815:Young Adult