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Dissertation
Essential kinematic parameters of attainment of sit-to-stand in children: relative location and momentum of center of mass
Doctor of Philosophy (Ph.D.), Drexel University
Aug 2002
DOI:
https://doi.org/10.17918/00009904
Abstract
The objectives of this study were to examine (1) essential kinematic parameters of attainment of sit-to-stand (STS) in children, and (2) relationships of the kinematics of the center of mass (COM) during STS across different ages and anthropometrics. The subjects were a sample of convenience of 27 children with typical development, 7-11 years old. The subjects sat in a standardized position and then stood up as naturally as possible (STS-N). Then, in a random order, the subjects attempted STS under two experiments: (1) when the forward lean of the trunk was limited to two-thirds (STS-D2/3) and one-third (STS-D1/3) of the distance that they naturally leaned the trunk; and (2) when the forward lean of the trunk was limited to two-thirds (STS-SP2/3) and one-third (STS-SP1/3) of the velocity of STS-N. Eighty-nine percent of the subjects attained STS-D2/3; however, only 22% attained STS-D1/3. For the limited STS conditions, the mean relative horizontal location of the COM was significantly posterior to the base of support (BOS) (p < 0.0005) while the mean maximum horizontal linear momentum of the COM significantly increased (p < 0.0005), compared to STS-N. In the unsuccessful STS-D1/3 only the mean relative horizontal location of the COM to the BOS significantly decreased compared to the successful STS-D1/3. All of the subjects attained STS-SP2/3 and STS-SP1/3. The mean relative horizontal location of the COM was significantly anterior to the BOS in these two limited speed conditions (p < 0.05). Correlation analysis revealed that the relative location of the COM to the BOS did not significantly correlate to either age or anthropometrics whereas the momentum of the COM significantly correlated to both age and anthropometrics. However, only anthropometrics significantly accounted for the variance of the momentum of the COM. Overall, this study suggests that the relative horizontal location of the COM to the BOS would be a primary essential kinematic parameter for the attainment of STS in children. The horizontal momentum of the COM is essential in assisting the COM to move into the BOS. The study also suggests physical growth (anthropometrics) rather than neural maturation (age) influences the kinematics of the COM during STS.
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Details
- Title
- Essential kinematic parameters of attainment of sit-to-stand in children
- Creators
- Saipin Prasertsukdee
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xvi, 167 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Nursing and Health Professions; Drexel University; Physical Therapy (and Rehabilitation Sciences)
- Other Identifier
- 991021889088804721