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Development of Upper Body Coordination During Sitting in Typically Developing Infants



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0031 3998 09 6505 0553 PEDIATRIC RESEARCH Copyright 2009 International Pediatric Research Foundation Inc Vol 65 No 5 2009 Printed in U S A Development of Upper Body Coordination During Sitting in Typically Developing Infants ANASTASIA KYVELIDOU WAYNE A STUBERG REGINA T HARBOURNE JOAN E DEFFEYES DANIEL BLANKE AND NICHOLAS STERGIOU HPER Biomechanics Lab A K J E D D B N S University of Nebraska at Omaha Omaha Nebraska 68182 Munroe Meyer Institute W A S R T H Environmental Agricultural and Occupational Health N S Health Promotion Social and Behavioral Health D B University of Nebraska Medical Center Omaha Nebraska 68198 Theory DST provides an alternative approach to the development of posture control According to DST development of posture control and generally movement skills is a product not only of central and cognitive information but arises from the synergistic organization of the neuromuscular system and the morphologic biomechanical and environmental constraints 1 3 Using this approach Thelen and Fisher 4 were able to explain stepping performance in newborns and identify that the disappearance of the newborn stepping response at about 2 mo is not due to changes in central processes but was due to the alterations that occur due to parallel development in body size and composition Similarly the same group has found that newborns can elicit adult like steps when walking on a treadmill due to the mechanical backward stretch by the belt on the legs This stretch practically provided the necessary hip strength needed for walking which is absent in newborns and eventually occurs due to development 5 Therefore we anticipate that the DST framework can provide with similar insights for another motor milestone the development of sitting posture a skill that has not received much research attention From a DST perspective the emergence of a movement behavior can be viewed as a path toward a stable attractor which is the preferred behavioral state of the system 1 3 Attractors



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