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Precise limb-speed afference reveals rhythmogenic drive modality and declines with age.

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The human nervous system precisely senses limb speed differences, crucial for coordinated movement. This ability declines with age, impacting mobility and independence in older adults.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Human locomotion relies on coordinated limb movements, which deteriorate with age, leading to frailty.
  • Age-related decline in motor control affects independence and increases fall risk.

Purpose of the Study:

  • To investigate the nervous system's ability to detect subtle inter-limb speed variations.
  • To determine if limb speed sensing is load-independent and how it changes across the human lifespan.

Main Methods:

  • A two-alternative forced-choice task was employed on a split-belt treadmill.
  • Participants detected minute differences in treadmill belt speeds.
  • Whole-body load was manipulated to assess its effect on speed discrimination.

Main Results:

  • Healthy young adults detected speed differences as low as 1.3%.
  • Varying body load did not affect the detection thresholds, suggesting speed computation.
  • Limb speed discrimination followed a U-shaped curve across ages 6-80, with lowest thresholds in young adults and increased thresholds in children and older adults.

Conclusions:

  • The human nervous system possesses high acuity in sensing limb speed.
  • Age-related decline in limb speed discrimination impacts motor control and mobility.
  • Limb speed sensing is a potential biomarker for age-related mobility decline and a target for rehabilitation.