J Sleep Med.  2018 Dec;15(2):62-67. 10.13078/jsm.18014.

Difference in Sleep Characteristics between Restless Leg Syndrome With and Without Periodic Limb Movement during Wakefulness

• Shin YY
• Byun JI
• Shin WC

• KMID: 2434748
• DOI: http://doi.org/10.13078/jsm.18014

Abstract

OBJECTIVES
Restless leg syndrome (RLS) is a common sensorimotor disorder and is frequently associated with periodic limb movement in sleep (PLMS). Also about one third of patient with RLS have periodic limb movement during wakefulness (PLMW). However there is little research on the correlation between PLMW and RLS. We aimed to evaluate difference in sleep characteristics between patients with RLS with PLMW and those without PLMW.
METHODS
Our study included twenty eight RLS patients. Subjects underwent suggested immobilization test (SIT) prior to one full-night polysomnography study. Patients were classified into two groups according to the presence of PLMW based on SIT-PLMW index. Polysomnographic findings, subjective sleep quality, and hematologic results were analyzed and compared between the two groups.
RESULTS
Mean age of patient with frequent PLMW (SIT-PLMW ≥40/hr) was significantly higher. RLS patients with frequent PLMW were also significantly related to insomnia severity. The PLMS index was higher in patients with PLMW and showed a significant correlation with the PLMW index.
CONCLUSIONS
PLMW influence sleep quality such as insomnia and is correlated with movement during sleep.

Keyword

Restless legs syndrome; Periodic leg movement during sleep; Periodic leg movement during wakefulness; Polysomnography; Suggested immobilization test

MeSH Terms

Extremities*
Humans
Immobilization
Polysomnography
Restless Legs Syndrome*
Sleep Initiation and Maintenance Disorders
Wakefulness*