Biomechanical Characteristics of Sit-to-stand Movements in Children with Spastic Diplegia in Natural and Loaded Conditions
|Keywords:||腦性麻痺;坐到站;荷重坐到站;阻力;動作;生物力學;cerebral palsy;sit-to-stand;loaded sit-to-stand;resistance;movement;biomechanics||Issue Date:||2005||Abstract:||
Background and Purposes: Children with spastic diplegia are characterized with muscle weakness and poor movement control ability. The loaded sit-to-stand (STS) training has demonstrated its effects in improving these children’s knee extensor strength and gross motor ability. However, mechanisms underlying the training are still unclear. Prior to probe into possible mechanisms, immediate responses of these children to externally imposed load should be examined first. The purpose of this study is to explore the immediate effects of load on children with spastic diplegia, with kinematic and kinetic analysis. Subjects: Thirteen children with spastic diplegia (106.5±26.8 months, 6 males and 7 females) and ten age-matched typical children (104.3±18.9 months, 7 males and 3 females) participated in this study. Methods: The Vicon 250 motion analysis system and 3 AMTI force platforms were used to collect data of STS movements. The experiment took two separate days to accomplish. On the first day, the STS1RM of individual children was determined. On the second day, kinematic and kinetic data of STS movements in natural and loaded (applying load of 50% STS1RM during STS movements) conditions were collected. Data of strategies, smoothness, maximal extension moment and power around hip and knee joints were then calculated. Results: In the kinematic aspect, strategies used in children with spastic diplegia and in typical children did not differ statistically. External load did not influence strategies used in children with spastic diplegia. Children with spastic diplegia demonstrated less smooth STS movements than did typical children in the natural condition and some of the former group demonstrated smoother movements alone the anterior-posterior direction in the loaded condition. In the kinetic aspect, children with spastic diplegia demonstrated smaller maximal extension moment and power of knee joints than did typical children in the natural condition. In the loaded condition, both the maximal hip and knee extension moment increased and the maximal knee extension moment increased to the level of typical children. Conclusion: Applying the load of 50% STS1RM during STS movements increased knee moment and also improve anterior-posterior movement control in some children with spastic diplegia. The loaded STS training may be clinically used for strengthening and movement proficiency enhancement.
|Appears in Collections:||物理治療學系所|
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