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Related Concept Videos

Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...

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Related Experiment Video

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Behavioral Assessments of Spontaneous Locomotion in a Murine MPTP-induced Parkinson's Disease Model
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Objective quantification of arm rigidity in MPTP-treated primates.

Thomas O Mera1, Matthew D Johnson, Darrin Rothe

  • 1Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH, USA.

Journal of Neuroscience Methods
|October 22, 2008
PubMed
Summary

Parkinson's disease rigidity can now be objectively measured using an automated arm rigidity testing (ART) system. This new quantitative method provides reliable, precise data for evaluating treatments and understanding disease mechanisms.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Movement Disorders

Background:

  • Rigidity is a key symptom of Parkinson's disease (PD).
  • Current methods for assessing rigidity are subjective and lack precision.
  • Objective quantification is needed to understand PD pathophysiology and treatment efficacy.

Purpose of the Study:

  • To develop and validate an automated arm rigidity testing (ART) system for objective rigidity measurement.
  • To compare ART system's quantitative measures with clinical assessments in a primate model of PD.

Main Methods:

  • Developed an automated system to move a primate limb between user-defined angles.
  • Recorded force-angle data and analyzed metrics like area and slope.
  • Incorporated electromyography to differentiate active and passive resistance.
  • Tested the system in rhesus macaques treated with MPTP to induce Parkinsonism.

Main Results:

  • The ART system successfully quantified rigidity in MPTP-treated macaques.
  • Significant changes in rigidity measures were detected after apomorphine administration and globus pallidus internus deep brain stimulation.
  • Total area, extension slope, and flexion slope were the most sensitive indicators of rigidity changes.

Conclusions:

  • The ART system offers an objective and quantitative method for assessing rigidity.
  • This tool can enhance the understanding of PD mechanisms and the evaluation of therapeutic interventions.
  • The system provides precise and reliable rigidity measures, overcoming limitations of subjective clinical assessments.