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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...
Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

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 28, 2026

An Instrumented Pull Test to Characterize Postural Responses
12:18

An Instrumented Pull Test to Characterize Postural Responses

Published on: April 6, 2019

Determining posture from physiological tremor.

Mark V Albert1, Konrad P Kording

  • 1Department of Physical Medicine and Rehabilitation, Rehabilitation Institute of Chicago, Northwestern University, 345 E Superior St., Room 1479, Chicago, IL 60611, USA. mark@mva.me

Experimental Brain Research
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to estimate body and limb posture using hand tremor. This technique avoids complex time integration, offering a simpler approach for clinical and research applications in posture measurement.

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Related Experiment Videos

Last Updated: May 28, 2026

An Instrumented Pull Test to Characterize Postural Responses
12:18

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Published on: April 6, 2019

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Clinical Measurement

Background:

  • Accurate measurement of body and limb posture is crucial for clinical studies and research.
  • Existing methods for posture measurement include direct optical/magnetic methods and indirect integration of sensor data (gyroscopes, accelerometers).
  • Current indirect methods often involve complex time integration, leading to potential complications.

Purpose of the Study:

  • To introduce a novel method for estimating body and limb posture from movement.
  • To demonstrate posture estimation without requiring time integration.
  • To utilize hand tremor as a viable indicator of arm posture.

Main Methods:

  • Recorded arm postures and associated hand tremor data from volunteers.
  • Analyzed the minor axis of the covariance of hand tremor.
  • Developed a technique to estimate forearm angle based on tremor characteristics.

Main Results:

  • Forearm angle was estimated with a standard deviation of approximately 4° when the elbow was supported.
  • Forearm angle estimation accuracy was approximately 10° when the elbow was unsupported.
  • The method allows for post hoc analysis of existing hand-position data.

Conclusions:

  • A new, non-integrative method for estimating body posture from hand tremor has been developed.
  • This tremor-based technique offers a complementary approach to existing posture measurement methods.
  • The method shows potential as a valuable tool for future research and clinical applications in posture assessment.