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Correlation between movement complexity during static standing and balance function in institutionalized older

Momoko Yamagata1, Tome Ikezoe1, Midori Kamiya1

  • 1Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto.

Clinical Interventions in Aging
|March 24, 2017
PubMed
Summary

Older adults with lower sample entropy (SampEn) in the sagittal plane demonstrated better standing balance. This suggests rigidity is a compensatory strategy for postural stability in older populations.

Keywords:
balancecomplexityentropyolder adultsposturestanding

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Area of Science:

  • Biomechanics and Motor Control
  • Gerontology
  • Physiology

Background:

  • Sample entropy (SampEn) quantifies movement complexity of the center of pressure (COP).
  • Lower SampEn indicates reduced complexity (rigidity) and fewer degrees of freedom.
  • Previous research linked increased SampEn to better balance in younger individuals, but this is unexplored in older adults.

Purpose of the Study:

  • To investigate the relationship between SampEn and standing balance ability in older adults.
  • To determine if SampEn in older adults correlates with measures of postural stability.

Main Methods:

  • Thirty-three institutionalized older adults (mean age 82.2 years) participated.
  • Center of pressure (COP) data during static standing were analyzed for SampEn and standard deviation (SD).
  • Balance was assessed using the One-leg Standing Test (OLST), Functional Reach (FR) test, and Lateral Reach (LR) test.

Main Results:

  • SampEn in the sagittal plane significantly correlated with OLST (r=-0.35) and FR (r=-0.36).
  • No significant relationships were found between SampEn in the frontal plane and balance tests.
  • SD of COP in both planes showed no correlation with any balance measures.

Conclusions:

  • Lower SampEn in the sagittal plane is associated with better standing balance in older adults.
  • This finding suggests that older adults may use body rigidity as a compensatory strategy for postural control.
  • Rigidity, indicated by lower SampEn, may be crucial for maintaining stability in advanced age.