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Region of Stability Derived by Center of Mass Acceleration Better Identifies Individuals with Difficulty in Sit-to-Stand Movement

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Abstract

Poor performance of sit-to-stand (STS) has been identified as one of the predictors of fall risk among elderly adults. This study examined differences in the whole body center of mass (COM) kinematic variables in relation to the regions of stability between elderly adults with difficulty in STS and healthy individuals. Whole body motion data while performing STS were collected from 10 young, 10 elderly and 10 elderly subjects with difficulty in STS. Young subjects were also asked to stand up with their trunk purposely bent forward. The regions of stability were defined with COM position at seat-off and its instantaneous velocity (ROSv) or peak acceleration (ROSa), using a single-link-plus-foot inverted pendulum model. Peak COM accelerations prior to seat-off differed significantly among groups; however, no significant differences were detected in its velocities at seat-off. The ROSa demonstrated a better ability to discriminate elderly adults with difficulty from healthy individuals. Although a similar COM momentum was observed at seat-off, how the momentum was controlled differed between healthy individuals and individuals with difficulty in STS. ROSa could provide insight into how the COM momentum is controlled prior to seat-off, which could be used to differentiate individuals with functional limitations from healthy individuals.

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Acknowledgments

The authors would like to thank Tzurei Chen for her help with data collection.

Conflict of interest

We declare that we have no commercial associations that might pose a conflict of interest in connection with the article.

Author information

Correspondence to Li-Shan Chou.

Additional information

Associate Editor Thurmon E. Lockhart oversaw the review of this article.

Associate Editor Michael S. Detamore oversaw the review of this article.

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Fujimoto, M., Chou, L. Region of Stability Derived by Center of Mass Acceleration Better Identifies Individuals with Difficulty in Sit-to-Stand Movement. Ann Biomed Eng 42, 733–741 (2014). https://doi.org/10.1007/s10439-013-0945-9

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Keywords

  • Sit-to-stand
  • Balance
  • Inverted pendulum model
  • Center of mass