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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...

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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...

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Related Experiment Video

Updated: May 23, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

[Orthostatic tremor: an enigmatic condition].

A Labiano-Fontcuberta¹, J Benito-Leon, C Dominguez-Gonzalez

¹Hospital Universitario 12 de Octubre, Madrid, Espana.

Revista De Neurologia

|March 28, 2012

Summary

Orthostatic tremor is a rare neurological disorder causing unsteadiness upon standing. This review details its clinical presentation, neurophysiology, and management strategies for better recognition and treatment.

Area of Science:

Neurology
Movement Disorders

Context:

Orthostatic tremor (OT) is a rare tremor syndrome.
Characterized by instability upon standing, improving with ambulation.
Absent when seated or supine.

Purpose:

To elucidate the primary characteristics of orthostatic tremor.
To provide a comprehensive overview of this enigmatic motor disorder.

Summary:

Defines the clinical spectrum and key diagnostic features of OT.
Describes the neurophysiological and electromyographic profile.
Addresses pathophysiological hypotheses and current therapeutic options.

Impact:

Facilitates rigorous clinical recognition of orthostatic tremor.

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Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

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Improves therapeutic management strategies for patients.

Enhances understanding of this rare neurological condition.