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Predictive neuromechanical simulations indicate why walking performance declines with ageing.

Seungmoon Song1, Hartmut Geyer1

  • 1The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

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Summary
This summary is machine-generated.

Ageing reduces walking speed and efficiency due to muscle strength and speed loss. Recovering muscle function may be key to improving elderly walking performance and quality of life.

Keywords:
elderly gaitmetabolic cost of transportmuscle atrophymuscle fatigueneuromechanical simulation

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Area of Science:

  • Biomechanics
  • Gerontology
  • Neuroscience

Background:

  • Ageing leads to slower, less efficient walking, impacting elderly quality of life.
  • The precise physiological causes of age-related gait decline are not fully understood.
  • Ageing involves complex neuro-musculo-skeletal changes, making experimental isolation of effects difficult.

Purpose of the Study:

  • To identify the primary physiological drivers of age-related decline in walking performance.
  • To simulate the effects of age-related changes on human gait using a predictive model.
  • To inform potential interventions for improving elderly walking.

Main Methods:

  • Utilized predictive neuromechanical simulations of human walking.
  • Incorporated age-related changes in skeletal, muscular, and nervous systems.
  • Separated the impact of individual physiological changes on gait parameters.

Main Results:

  • Simulations replicated elderly walking patterns, confirming age-related changes' effects.
  • Loss of muscle strength and mass were identified as major contributors to reduced walking economy.
  • Decreased muscle strength and speed predominantly caused slower preferred walking speeds, especially when adapting to fatigue.

Conclusions:

  • Muscle-related changes, specifically loss of strength and speed, are dominant factors in age-related walking decline.
  • Targeting muscular recovery may be the most effective strategy for enhancing elderly walking performance.
  • Findings offer insights into gait alterations due to ageing, injury, and disorders.