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Does symmetrical upper limb task involve symmetrical postural adjustments?

M Mezaour1, E Yiou, S Le Bozec

  • 1Laboratory of Motor Control and Perception, EA 4042, UFR STAPS, University of Paris-Sud 11, 91440 Orsay Cedex, France.

Gait & Posture
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Summary

This study found that symmetrical upper limb tasks lead to asymmetrical postural adjustments in young adults, with differences observed in leg muscle activity during movement and correction phases.

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Area of Science:

  • Biomechanics
  • Human motor control
  • Neuroscience

Background:

  • Postural control is crucial for stable bipedal locomotion.
  • Symmetrical upper limb tasks typically require coordinated postural adjustments.
  • Lower limb dominance may influence postural strategies during bilateral tasks.

Purpose of the Study:

  • To investigate if symmetrical upper limb tasks elicit asymmetrical postural adjustments based on lower limb dominance.
  • To compare postural muscle activity during bilateral forward-reach tasks in unipedal and bipedal stances.

Main Methods:

  • Ten healthy young adults performed bilateral forward-reach tasks.
  • Tasks were performed standing on the dominant leg, non-dominant leg, or both legs.
  • Integrated electromyographical (iEMG) activity of postural muscles was recorded and analyzed.

Main Results:

  • No significant changes in anticipatory postural adjustments (APAs) were observed between stance conditions.
  • Online postural adjustments (OPAs) showed increased semitendinosus activity in the dominant leg and soleus activity in the non-dominant leg.
  • Corrective postural adjustments (CPAs) revealed increased soleus, tibialis anterior, and semitendinosus activity in the non-dominant leg, with no changes in the dominant leg.

Conclusions:

  • Symmetrical upper limb tasks involve asymmetrical postural adjustments related to lower limb dominance.
  • Leg dominance influences muscle activation patterns during the online and corrective phases of postural control.
  • These findings highlight the role of side dominance in the postural component of bilateral upper limb movements.