Studying movement reorganization when learning a whole-body action: Example of learning a constrained gait pattern

International Conference on Sports Medicine and Fitness

March 23-25, 2015 Chicago, USA

Lina Majed

Scientific Tracks Abstracts: J Sports Med Doping Stud

Abstract :

In order to better understand the process of learning a complex motor skill, an effort was done to identify principles of movement reorganization. However, many studies refuted the existence of generalized invariant �??strategies�?� for mastering the redundant degrees of freedom and emphasized the importance of the constraints especially those linked to the task itself. We aimed to identify common characteristics in movement reorganization when 7 participants practiced (4 sessions) a new gait pattern at speeds higher than that of the preferred walk-to-run transition by placing biomechanical constraints on distal lower joints (i.e. racewalking regulations). Movement analysis was performed on kinematic variables computed from a whole-body model (VICON). First, using ANOVAs we assessed practice-related changes in spatiotemporal parameters, angular displacements and relative phases (inter-/intra-limb coordination). Results indicated an immediate reorganization incoordinative patterns (e.g., relative phases and stride frequency) accompanied by a general decrease in the initial movement variability (i.e., standard deviation of many key variables). However, the large number of studied variables made it difficult to put forward common �??strategies�?� used by participants. Second, we ran principal component analyses (PCA) on 8 major angular displacement variables for all participants, trials and sessions. PCA were used to evaluate the coupling in the motion of body segments that synchronize in different components (dimensions), each believed to be controlled by the CNS as one unit. Results indicated that the majority of participants immediately recruited an additional task-specific control dimension compared to normal walking. Moreover, this analysis revealed a gradual synchronization of the knee joint motion with that of the early established pelvis transverse plane rotation.

Biography :

Lina Majed is an Assistant Professor at the Sport Science Program in Qatar University. She successfully completed both her PhD (Human Movement Science) and her MSc (Motor Control and Perception) from Paris-Sud University. Her research focused on a multidisciplinary approach of human motor behaviors, specifically motor learning and human gait analysis. She examined invariant strategies in movement reorganization when learning a global motor skill and the link to metabolic optimization. She is currently working on characteristics of gait patterns in different populations (e.g., obesity) for optimal exercise prescription.