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Related Experiment Videos

Preparatory trunk motion accompanies rapid upper limb movement

P Hodges1, A Cresswell, A Thorstensson

  • 1Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.

Experimental Brain Research
|February 3, 1999
PubMed
Summary
This summary is machine-generated.

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Trunk orientation is a controlled variable during rapid upper limb movements. This study shows preparatory trunk movements and deep abdominal muscle activation contribute to spinal stability, independent of limb motion direction.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Motor Control

Background:

  • Understanding postural control mechanisms is crucial for preventing injuries during dynamic activities.
  • The role of trunk orientation and muscle activation in anticipatory postural adjustments remains an area of active research.

Purpose of the Study:

  • To investigate whether trunk orientation is a controlled variable before and during rapid bilateral upper limb movements.
  • To examine trunk muscle activation patterns and their relationship to limb movement direction and spinal stability.

Main Methods:

  • Subjects performed rapid bilateral symmetrical upper limb movements in flexion, abduction, and extension.
  • Measurements included trunk movements, trunk muscle activation (superficial and deep), intra-abdominal pressure, and displacement of centers of pressure and mass.

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Main Results:

  • A consistent, small initial angular displacement of trunk segments occurred opposite to reactive moments from limb movement.
  • Superficial trunk muscles showed phasic activation consistent with preparatory motion and center of mass direction.
  • Deep abdominal muscle activation was direction-independent, suggesting a non-specific role in spinal stability.

Conclusions:

  • Feedforward postural responses generate trunk movements, indicating trunk orientation is a controlled variable.
  • Both trunk orientation and center of mass are actively controlled variables during rapid limb movements.