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Individual Coordinative Structures During Single-Legged Stance Present Lateral Asymmetry.

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Individual coordination patterns in single-legged stance vary by support limb. While joint and segment involvement differs across people, strategies adapt based on which leg maintains balance.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Motor Control

Background:

  • Postural control is crucial for stability, especially during single-legged stance.
  • Previous research often assumed uniform movement patterns, overlooking individual differences.
  • Understanding lateral preference effects on coordination is key for personalized rehabilitation.

Purpose of the Study:

  • To investigate how lateral preference influences angular coordination during single-legged postural control.
  • To analyze individual coordination patterns rather than assuming collective motion modes.
  • To determine if coordination strategies differ between the preferred and non-preferred lower limbs.

Main Methods:

  • Nineteen healthy adults performed single-legged stances.
  • Motion capture (Vicon System) recorded 39 markers to calculate 30 joint angles.
  • Principal Component Analysis (PCA) and cluster analysis were applied to individual data.

Main Results:

  • No consistent pattern of joint or segment participation in principal modes was found across individuals.
  • The upper body and lower segments were consistently involved in the main coordination modes.
  • Cluster analysis revealed distinct groupings of coordination patterns based on the supporting lower limb.

Conclusions:

  • Joint and segment involvement in postural control is highly individualized.
  • Despite individual heterogeneity, distinct coordination strategies emerge depending on the stance limb.
  • Lateral preference significantly impacts how coordination patterns are adapted during single-legged balance.