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Related Concept Videos

REM Sleep Behavior Disorder01:15

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REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
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Related Experiment Video

Updated: Mar 26, 2026

Dynamic Digital Biomarkers of Motor and Cognitive Function in Parkinson's Disease
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Does Postural Rigidity Decrease during REM Sleep without Atonia in Parkinson Disease?

Dario Arnaldi1,2, Alice Latimier3, Smaranda Leu-Semenescu1,3

  • 1APHP- Pitié-Salpêtrière Hospital, Sleep Disorders Unit, Paris, France.

Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine
|February 10, 2016
PubMed
Summary
This summary is machine-generated.

Parkinson disease (PD) rigidity persists during REM sleep in patients with REM sleep behavior disorder (RBD), unlike in idiopathic RBD. This suggests PD and RBD muscle tone coexist, impacting movement initiation.

Keywords:
REM sleep behavior disordersynucleinopathy

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Movement Disorders

Background:

  • Rigidity is a hallmark of Parkinson disease (PD).
  • REM sleep behavior disorder (RBD) involves increased muscle tone during REM sleep.
  • It is unclear if PD-related rigidity is reduced during REM sleep in PD patients with RBD.

Purpose of the Study:

  • To investigate if wake postural rigidity is attenuated during REM sleep without atonia in patients with PD and RBD.

Main Methods:

  • Measured levator menti muscle activity during wakefulness and sleep stages in PD patients (with/without RBD), idiopathic RBD patients, and healthy controls.
  • Analyzed chin muscle tone amplitude across different sleep stages.

Main Results:

  • Chin muscle tone decreased from wakefulness to N2, N3, and atonic REM sleep in all groups.
  • PD patients with RBD showed the highest chin muscle tone during atonic REM sleep.
  • Muscle tone did not attenuate from wake to REM sleep in PD with RBD, but attenuated by 40% in idiopathic RBD.

Conclusions:

  • PD-related hypertonia and RBD-related enhanced muscle tone coexist during REM sleep in PD patients with RBD.
  • This combined effect impacts chin muscle tone.
  • Rapid RBD movements may initiate against this rigid postural tone.