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Related Experiment Video

Updated: May 7, 2026

Force and Position Control in Humans - The Role of Augmented Feedback

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

Trajectory adjustments underlying task-specific intermittent force behaviors and muscular rhythms.

Yi-Ching Chen¹, Yen-Ting Lin, Chien-Ting Huang

¹School of Physical Therapy, Chung Shan Medical University, Taichung City, Taiwan ; Physical Therapy Room, Chung Shan Medical University Hospital, Taichung City, Taiwan.

|October 8, 2013

Summary

This study reveals that dynamic force tracking involves more complex and frequent adjustments than static tracking. Force intermittency and muscle oscillations differ significantly between static and dynamic force control tasks.

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Area of Science:

Motor Control
Human Physiology
Biomechanics

Background:

Force intermittency is a primary contributor to motor variability.
Understanding force trajectory fine-tuning is crucial for motor control research.

Purpose of the Study:

To investigate how force trajectory is fine-tuned for static versus dynamic force-tracking.
To analyze the dynamics of force intermittency during different force-tracking tasks.

Main Methods:

Twenty-two healthy adults performed static and dynamic unilateral resistance protocols.
Electromyographic activity and force profiles were monitored during force-tracking tasks.
Force signals were decomposed to analyze primary movement and force intermittency profiles.

Main Results:

Dynamic force-tracking showed greater intermittency amplitude and force pulses compared to static tracking.
Multi-scale entropy analysis indicated differing complexity and regularity of force intermittency between tasks.
Dynamic tracking exhibited reduced 8-12 Hz and potentiated 35-50 Hz muscular oscillations compared to static tracking.

Conclusions:

Force intermittency dynamics differ significantly between static and dynamic force-tracking tasks.
Dynamic force-tracking requires more intricate and frequent trajectory adjustments.
Task-specific organizations of alpha and gamma band muscular oscillations underpin differing force control strategies.