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Force and Position Control in Humans - The Role of Augmented Feedback
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Physiological tremor (8-12Hz component) in isometric force control.

Thomas Novak1, Karl M Newell1

  • 1Department of Kinesiology, The University of Georgia, United States.

Neuroscience Letters
|January 23, 2017
PubMed
Summary

Physiological tremor (8-12Hz) directly impacts isometric force control variability. Its influence on force steadiness decreases as force output increases, with no difference between dominant and non-dominant hands.

Keywords:
Isometric forcePhysiological tremorSample entropySpectral profile

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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Biomechanics

Background:

  • Physiological tremor is an inherent rhythmic movement.
  • Understanding tremor's role in motor control is crucial for various applications.
  • Isometric force control is fundamental to many physical tasks.

Purpose of the Study:

  • To investigate how physiological tremor affects isometric force control.
  • To examine the relationship between tremor amplitude, force level, and hand dominance.
  • To determine tremor's influence on force signal variability and regularity.

Main Methods:

  • Participants performed uni-manual isometric finger abduction at varying maximal voluntary contraction (MVC) levels (5-85%).
  • Force output variability was assessed using Root Mean Square Error (RMSE) and Sample Entropy.
  • Tremor amplitude and its correlation with force control metrics were analyzed for both dominant and non-dominant hands.

Main Results:

  • Tremor amplitude increased with higher force levels.
  • Increased tremor amplitude correlated with poorer performance (higher RMSE) and altered force signal regularity (Sample Entropy).
  • No significant differences in force variability were observed between dominant and non-dominant hands.

Conclusions:

  • Physiological tremor has a direct, albeit small, influence on isometric force variability.
  • The relative impact of tremor on force control diminishes as the required force level increases.
  • Hand dominance does not appear to significantly modulate the effects of tremor on isometric force control.