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Related Concept Videos

Muscle Stimulation Frequency01:22

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
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Related Experiment Video

Updated: Nov 15, 2025

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
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Applying Stretch to Evoke Hyperreflexia in Spasticity Testing: Velocity vs. Acceleration.

Lizeth H Sloot1,2, Guido Weide1,3, Marjolein M van der Krogt1

  • 1Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Rehabilitation Medicine, Amsterdam Movement Sciences, Amsterdam, Netherlands.

Frontiers in Bioengineering and Biotechnology
|March 5, 2021
PubMed
Summary

In spastic paresis (SP), muscle responses to stretch are amplified and influenced by velocity and acceleration. Higher velocity increases response intensity, while higher acceleration speeds up response onset in triceps surae muscles.

Keywords:
cerebral palsyhyperreflexiaspastic paresisspasticity assessmentstretch reflexupper motor neuron

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Area of Science:

  • Neurology
  • Biomechanics
  • Neuroscience

Background:

  • Muscles in neurological diseases often show hyper-resistance to stretch due to hyperreflexia.
  • Understanding biomechanical triggers of reflex responses is crucial but limited.

Purpose of the Study:

  • To investigate the effects of velocity and acceleration on triceps surae muscle responses in children with spastic paresis (SP).
  • To compare these responses with typically developing (TD) children.

Main Methods:

  • Used a motor-operated ankle manipulator to apply controlled velocity and acceleration profiles.
  • Measured triceps surae muscle activation (EMG) in SP and TD children.
  • Analyzed response intensity and timing in SP group.

Main Results:

  • Muscle activation was significantly larger in SP children compared to TD children.
  • Higher peak velocity correlated with increased EMG burst intensity in SP.
  • Higher peak acceleration led to faster EMG burst onset in SP, while higher velocity delayed it.

Conclusions:

  • Exaggerated muscle response intensity in SP is linked to stretch velocity.
  • Higher accelerations trigger faster responses in SP triceps surae muscles.
  • Differentiating biomechanical triggers is key for precise clinical tools and understanding hyperreflexia in functional movements.