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Douglas Mitchell1, Francesca E Wade1

  • 1School of Exercise and Nutritional Sciences, San Diego State University, San Diego, CA, USA.

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Summary

The Dynamic Gait Index (DGI) may not fully capture walking changes under cognitive load. Dual-task cost (DTC) is more sensitive to subtle gait impairments, suggesting its integration for better mobility screening.

Keywords:
aging mobilitycognitive–motor interferencefall riskwalking stability

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Area of Science:

  • Gerontology
  • Biomechanics
  • Neuroscience

Background:

  • Dual-task performance is crucial for daily mobility, involving simultaneous walking and cognitive tasks.
  • The Dynamic Gait Index (DGI) is a common tool for assessing walking capacity.
  • The DGI's sensitivity to cognitive load effects on gait remains uncertain.

Purpose of the Study:

  • To investigate the association between Dynamic Gait Index (DGI) scores and dual-task cost (DTC) in adults.
  • To determine if DGI captures gait changes under cognitive load.
  • To assess the utility of DTC in evaluating functional gait across varying abilities.

Main Methods:

  • Adult participants (N=41, SD=19) completed treadmill walking under single- and dual-task (visual-verbal Stroop) conditions.
  • Gait parameters including step length, step width, double support time, and trailing limb angle were measured.
  • Dual-task cost (DTC) was calculated to quantify the effect of cognitive load on walking.

Main Results:

  • Significant dual-task effects were observed across primary walking measures, indicating cognitive load impacts gait.
  • Large interindividual variability in dual-task effects was noted.
  • No significant correlations were found between Dynamic Gait Index (DGI) scores and dual-task cost (DTC).

Conclusions:

  • The Dynamic Gait Index (DGI) and dual-task cost (DTC) measure distinct aspects of walking function.
  • DGI is effective for identifying gross gait impairments.
  • DTC is more sensitive to subtle gait alterations under cognitive load, recommending its inclusion in mobility screening, especially for aging and preclinical populations.