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Related Concept Videos

Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

29
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 ll01:12

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...
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Does movement variability increase or decrease when a simple wrist task is performed during acute wrist extensor

Michael J G Bergin1, Kylie J Tucker, Bill Vicenzino

  • 1NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia.

European Journal of Applied Physiology
|December 10, 2013
PubMed
Summary
This summary is machine-generated.

Acute pain constrains movement variability in simple tasks, contrary to complex tasks. The nervous system reduces variability of elements (VAR(elements)) to maintain task goals during pain.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Pain Research

Background:

  • Movement variability (VAR(elements)) aids complex task goal maintenance.
  • Pain can increase VAR(elements), potentially facilitating search for alternative movements.
  • Impact of pain on VAR(elements) in simple tasks remains unclear.

Purpose of the Study:

  • To investigate if VAR(elements) increases during acute pain in simple movements.
  • To determine if task goals are maintained despite pain in simple tasks.
  • To examine changes in VAR(elements) over time during painful simple movements.

Main Methods:

  • Three-dimensional motion analysis recorded wrist/forearm movements during a radial-ulnar deviation task.
  • Measured task success (goal attainment, error) and VAR(elements) (flexion-extension, pronation-supination).
  • Healthy participants performed the task with and without induced wrist extensor muscle pain.

Main Results:

  • Task goal achievement was maintained during acute pain.
  • VAR(elements) in pronation-supination reduced, and in flexion-extension, it did not change.
  • Contrary to hypotheses, variability of task elements was constrained, not increased, in simple tasks.

Conclusions:

  • The nervous system constrains VAR(elements) in simple tasks with limited degrees of freedom.
  • This reduction in variability contrasts with the increase observed in more complex tasks.
  • Findings suggest a different adaptive strategy for simple versus complex movements under pain.