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Related Experiment Video

Updated: May 24, 2026

The Impact of Motor Task Conditions on Goal-Directed Arm Reaching Kinematics and Trunk Compensation in Chronic Stroke Survivors
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Quantifying individual muscle contribution to three-dimensional reaching tasks.

Annelies Vandenberghe1, Lode Bosmans, Joris De Schutter

  • 1Department of Biomedical Kinesiology, Katholieke Universiteit Leuven, Tervuursevest 101, B-3001 Heverlee, Belgium.

Gait & Posture
|March 14, 2012
PubMed
Summary

This study reveals how individual upper limb muscles contribute to 3D arm movements. Muscle actions change based on reaching direction, impacting joint control and coordination.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Understanding upper limb (UL) muscle coordination is crucial for analyzing complex 3D reaching tasks.
  • Individual muscle contributions to specific degrees of freedom (DOFs) in arm motion remain incompletely understood.

Purpose of the Study:

  • To investigate and quantify the individual muscle contributions to 3D arm motion during reaching tasks.
  • To elucidate the complex muscular coordination patterns governing upper limb kinematics.

Main Methods:

  • Utilized a scaled musculoskeletal model to calculate muscle excitations for replicating observed kinematics.
  • Employed computed muscle control and forward simulation techniques.
  • Performed perturbation analyses by increasing muscle excitation to quantify individual DOF contributions.
  • Validated findings against electrical stimulation experiments.

Main Results:

  • Demonstrated that muscle action during reaching is highly dependent on the 3D trajectory.
  • Observed significant changes, including reversals, in muscle action magnitude when reaching to different heights and widths.
  • Reported muscle effects on non-spanned joints, highlighting complex interdependencies.

Conclusions:

  • Individual muscle contributions to 3D joint kinematics of the upper limb are position-dependent.
  • Muscle coordination during reaching is adaptable and trajectory-specific.
  • This research provides a detailed understanding of muscle function in complex arm movements.