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Related Experiment Videos

Aging, visual intermittency, and variability in isometric force output.

Jacob J Sosnoff1, Karl M Newell

  • 1Department of Kinesiology and Community Health, 207 Freer Hall (MC 052), University of Illinois at Urbana-Champaign, 906 S. Goodwin Avenue, Urbana, IL 61822, USA. jsosnoff@uiuc.edu

The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
|February 25, 2006
PubMed
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Older adults exhibit increased force variability due to information-processing limitations, not slower visual motor processing (VMP) time. This finding impacts understanding of age-related motor control changes.

Area of Science:

  • Motor Control
  • Human Aging
  • Cognitive Neuroscience

Background:

  • Age-related decline in motor control is a significant concern.
  • Increased force variability is a common observation in older adults.
  • The role of visual motor processing (VMP) time in this variability is not fully understood.

Purpose of the Study:

  • To investigate the relationship between visual motor processing (VMP) time and force variability in older adults.
  • To test the hypothesis that increased VMP time contributes to age-related force variability.
  • To explore underlying mechanisms of age-related motor control changes.

Main Methods:

  • Isometric force production tasks were performed by young and old adults.
  • Intermittency rate of visual feedback was manipulated over a 100-fold range.

Related Experiment Videos

  • Force output variability and minimal VMP time were measured and analyzed.

    • Main Results:

    • Older adults demonstrated significantly higher force variability and more structured force output compared to young adults.
    • Minimal VMP time was found to be increased in older adults.
    • No significant correlation was observed between VMP time and force variability.

    Conclusions:

    • Age-related increases in force variability are likely due to limitations in information-processing capacity.
    • Decreased VMP time is not the primary cause of age-related force variability.
    • Findings suggest broader cognitive factors influence motor control in aging.