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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Fall prevention modulates decisional saccadic behavior in aging.

Olivier A Coubard1

  • 1The Neuropsychological Laboratory, CNS-Fed Paris, France.

Frontiers in Aging Neuroscience
|July 19, 2012
PubMed
Summary

Fall prevention training improved saccadic control in older adults by enhancing motor responses and reducing variability. This suggests physical activity positively impacts central motor control processes.

Keywords:
agingeye movementsmotor activitymotor controlplasticity

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Area of Science:

  • Gerontology
  • Neuroscience
  • Motor Control

Background:

  • Aging populations experience increased fall frequency and motor decline.
  • Physical activity and skill learning benefit balance and reduce fall risk in older adults.
  • The impact of fall prevention programs on underlying motor control remains under-explored.

Purpose of the Study:

  • To investigate the effects of fall prevention (FP) training on saccadic control in older adults.
  • To analyze changes in saccade timing, dynamics, and underlying motor control processes.

Main Methods:

  • 12 older adults (64-91 years) underwent 2.5 months of FP training.
  • Saccades were recorded before and after training.
  • Traditional saccade analysis and LATER model quantitative analysis were performed.

Main Results:

  • FP training reduced inappropriate anticipatory and express saccades, and increased appropriate express saccades.
  • Saccade latency decreased, and left-right symmetry of motor responses improved.
  • Within-participant variability in saccade duration, amplitude, and peak velocity was reduced.
  • LATER analysis indicated FP modulates decisional thresholds, with a new TIMER-RIDER model proposed.

Conclusions:

  • Fall prevention training positively influences saccadic control in older adults.
  • FP training enhances motor response efficiency and consistency.
  • The findings provide new insights into how motor training affects central motor control.