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Electro-mechanical Systems01:19

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Electromechanical delay: An experimental artifact.

D M Corcos1, G L Gottlieb, M L Latash

  • 1College of Kinesiology, University of Illinois at Chicago, USA.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

Electromechanical delay, the time between muscle activation and force, has two components. The study finds the absolute duration lacks physiological meaning, urging caution when interpreting changes.

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Area of Science:

  • Biomechanics
  • Muscle Physiology
  • Motor Control

Background:

  • Electromechanical delay (EMD) is the time lag between muscle activation and force/motion onset.
  • EMD is used to study reaction time, muscle physiology, and population differences.

Purpose of the Study:

  • To dissect electromechanical delay into its constituent components.
  • To investigate the factors influencing the force generation time component of EMD.

Main Methods:

  • Analysis of electromechanical delay as a sum of transport time and force generation time.
  • Mathematical modeling of the force generation time component based on device threshold, force rise rate, and mechanical impedances.

Main Results:

  • Electromechanical delay comprises a brief transport time (t(t)) and a longer force generation time (t(f)).
  • Force generation time (t(f)) is determined by the interplay of measurement device threshold, muscle force rise rate, and the mechanical impedances of the device and muscle.

Conclusions:

  • The absolute measured value of electromechanical delay is not physiologically or psychologically meaningful.
  • Changes in electromechanical delay due to task or performance require careful interpretation due to confounding factors.