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Analysis of Vertical Micro Acceleration While Standing Reveals Age-Related Changes
Tadayoshi Minamisawa1, Noboru Chiba2, Kaori Inoue2
1Department of Physical Therapy, Yamagata Prefectural University of Health Sciences, 260 Kamiyanagi, Yamagata 990-2212, Japan.
Micro vertical acceleration of center of mass (vCOMacc) analysis reveals distinct aging patterns in standing control. Higher vCOMacc frequencies and specific muscle correlations in older adults suggest its potential as an aging marker.
Area of Science:
- Biomechanics
- Gerontology
- Human Movement Science
Background:
- Standing balance relies on complex neuromuscular control.
- Aging is associated with declines in postural stability.
- Objective markers are needed to quantify age-related changes in standing control.
Purpose of the Study:
- To investigate the fluctuation characteristics of micro vertical acceleration of center of mass (vCOMacc) during standing.
- To examine the utility of vCOMacc as an aging marker for standing control abilities.
- To explore the relationship between vCOMacc and lower limb muscle activity in young and older adults.
Main Methods:
- vCOMacc was calculated from vertical ground reaction forces measured by a force plate.
- Continuous wavelet transform analyzed vCOMacc frequency structure.
- Time domain analysis (RMS, MA) and correlation with lower limb muscle activity were performed.
Main Results:
- Older adults exhibited a higher relative frequency band of vCOMacc compared to young adults.
- Time domain indicators effectively distinguished age-related differences in standing control.
- vCOMacc correlated with the soleus muscle in young adults and the gastrocnemius muscle in older adults.
Conclusions:
- vCOMacc reflects age-related changes in standing control mechanisms.
- Differences in muscle activity may contribute to observed vCOMacc patterns.
- vCOMacc shows promise as a non-invasive tool for assessing aging effects on postural stability.
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