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Basic elements of arm postural control analyzed by unloading.

Philippe S Archambault1, Pavel Mihaltchev, Mindy F Levin

  • 1Centre de Recherche en Sciences Neurologiques, Université de Montréal, Montreal, Quebec, H3S 2J4, Canada. philippe.archambault@uniromal.it

Experimental Brain Research
|April 28, 2005
PubMed
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This study reveals that the nervous system controls arm posture by adjusting a referent configuration (R). This adjustment influences involuntary responses to unloading, impacting shoulder and elbow muscle activity.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Understanding arm posture control is crucial for motor neuroscience.
  • Previous research has not fully elucidated the mechanisms behind involuntary postural adjustments.
  • The role of central motor commands in adapting to external perturbations remains an active area of investigation.

Purpose of the Study:

  • To investigate how arm posture is controlled during unloading perturbations.
  • To analyze shoulder and elbow muscle responses to changes in external load.
  • To determine the neural mechanisms underlying involuntary postural adjustments.

Main Methods:

  • Analysis of shoulder-elbow unloading responses in the horizontal plane.
  • Use of a double-joint manipulandum to apply and suddenly diminish loads.

Related Experiment Videos

  • Measurement of electromyographic activity in shoulder and elbow muscles.
  • Calculation of joint torques and analysis of arm configuration.

    • Main Results:

    • Unloading elicited smooth, involuntary hand movements with bell-shaped velocity profiles.
    • Muscle activity and joint torques changed with the amount of unloading and load direction.
    • A referent configuration (R) was identified, which varied with initial load direction.
    • Electromyographic data suggest central modification of muscle activation thresholds.

    Conclusions:

    • The referent configuration (R) is a key variable in both voluntary and involuntary arm posture control.
    • The nervous system actively modifies the R configuration for task-specific control.
    • This central modification allows for adaptation to new load directions and generation of involuntary responses.