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Contrasting Age Effects on Complexity of Tracking Force and Force Fluctuations During Monorhythmic Contraction.

Authors
  • Chen, Yi-Ching
  • Lin, I-Chen
  • Lin, Yen-Ting
  • Huang, Wei-Min
  • Huang, Chien-Chun
  • Hwang, Ing-Shiou
Type
Published Article
Journal
Journal of aging and physical activity
Publication Date
Oct 17, 2019
Pages
1–8
Identifiers
DOI: 10.1123/japa.2019-0034
PMID: 31629359
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This study contrasted the stochastic force component between young and older adults, who performed pursuit tracking/compensatory tracking by exerting in-phase/antiphase forces to match a sinusoidal target. Tracking force was decomposed into the force component containing the target frequency and the nontarget force fluctuations (stochastic component). Older adults with inferior task performance had higher complexity (entropy across time; p = .005) in total force. For older adults, task errors were negatively correlated with force fluctuation complexity (pursuit tracking: r = -.527 to -.551; compensatory tracking: r = -.626 to -.750). Notwithstanding an age-related increase in total force complexity (p = .004), older adults exhibited lower complexity of the stochastic force component than young adults did (low frequency: p = .017; high frequency: p = .035). Those older adults with a higher complexity of stochastic force had better task performance due to the underlying use of a richer gradation strategy to compensate for impaired oscillatory control.

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