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Alterations in Muscle Tone lll

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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...

Cardiomyopathy IV: Restrictive Cardiomyopathy

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Alterations in Muscle Tone ll

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Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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Related Experiment Video

Updated: May 12, 2026

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

Published on: October 19, 2016

[Stiff man syndrome and variants].

¹Neurologische Universitätsklinik Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Deutschland. hans-michael_meinck@med.uni-heidelberg.de

|April 10, 2013

Summary

This summary is machine-generated.

Stiff man syndrome (SMS) is a rare neurological disorder with difficult-to-diagnose motor and psychological symptoms. Autoimmunity is key, and early, intensive methylprednisolone treatment shows promise for managing this condition.

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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

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Last Updated: May 12, 2026

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

Measuring the Stiffness of Ex Vivo Mouse Aortas Using Atomic Force Microscopy

Published on: October 19, 2016

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies

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Published on: January 31, 2013

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

Published on: April 18, 2011

Area of Science:

Neurology
Immunology
Neuroimmunology

Context:

Stiff man syndrome (SMS) and its variants are rare neurological disorders.
Characterized by unusual motor and psychological symptoms.
Frequent misdiagnoses occur, often confused with psychogenic movement disorders.

Purpose:

To highlight the diagnostic challenges in Stiff man syndrome.
To underscore the autoimmune basis of SMS.
To review effective treatment strategies for Stiff man syndrome.

Summary:

Clinical suspicion of SMS can be confirmed through neurophysiological and immunological testing.
Autoimmunity targeting inhibitory synapse proteins links SMS to other autoimmune conditions.
Retrospective analyses suggest front-loaded, long-term methylprednisolone is the most effective treatment.

Impact:

Improved diagnostic accuracy for Stiff man syndrome.
Enhanced understanding of the autoimmune pathophysiology of SMS.
Guidance towards optimal therapeutic interventions for Stiff man syndrome patients.