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Immobilization tests and periodic leg movements in sleep for the diagnosis of restless leg syndrome.
Mov Disord. 1998 Mar; 13(2):324-9.MD

Abstract

Patients with restless leg syndrome (RLS) complain of motor restlessness, usually occurring while they rest in the evening. Two immobilization tests have been described to assess leg restlessness in these patients. In the first test, the patient sits in bed with his or her legs outstretched while electromyograms are recorded from right and left anterior tibialis muscles for an hour (Suggested Immobilization Test [SIT]); in the second test, the legs are immobilized in a stretcher (Forced Immobilization Test [FIT]). In the current study, the SIT and the FIT were compared in patients with RLS and normal control subjects matched for age and sex. More leg movements were seen in patients than in controls during immobilization tests, especially the SIT. These movements were periodic, occurring at a frequency of approximately one every 12 seconds. The SIT (index > 40) was found to discriminate between RLS and control subjects better than the FIT (index > 25). Patients were also recorded during two consecutive nights to measure periodic leg movements in sleep (PLMS). A SIT index greater than 40 and a PLMS index greater than 11 (highest PLMS index of 2 consecutive nights) were found to discriminate patients with RLS from control subjects with similar power. With each of these two measures, the clinical diagnosis was correctly predicted in 81% of patients and 81% of the control subjects. The SIT has several advantages over the measure of the PLMS index; it does not require an all-night polygraphic recording and can be administered several times a day to measure circadian fluctuation of motor restlessness.

Authors+Show Affiliations

Centre d'étude du Sommeil, Hôpital Sacré-Coeur de Montréal, and Université de Montréal, Québec, Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9539348

Citation

Montplaisir, J, et al. "Immobilization Tests and Periodic Leg Movements in Sleep for the Diagnosis of Restless Leg Syndrome." Movement Disorders : Official Journal of the Movement Disorder Society, vol. 13, no. 2, 1998, pp. 324-9.
Montplaisir J, Boucher S, Nicolas A, et al. Immobilization tests and periodic leg movements in sleep for the diagnosis of restless leg syndrome. Mov Disord. 1998;13(2):324-9.
Montplaisir, J., Boucher, S., Nicolas, A., Lesperance, P., Gosselin, A., Rompré, P., & Lavigne, G. (1998). Immobilization tests and periodic leg movements in sleep for the diagnosis of restless leg syndrome. Movement Disorders : Official Journal of the Movement Disorder Society, 13(2), 324-9.
Montplaisir J, et al. Immobilization Tests and Periodic Leg Movements in Sleep for the Diagnosis of Restless Leg Syndrome. Mov Disord. 1998;13(2):324-9. PubMed PMID: 9539348.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Immobilization tests and periodic leg movements in sleep for the diagnosis of restless leg syndrome. AU - Montplaisir,J, AU - Boucher,S, AU - Nicolas,A, AU - Lesperance,P, AU - Gosselin,A, AU - Rompré,P, AU - Lavigne,G, PY - 1998/4/16/pubmed PY - 1998/4/16/medline PY - 1998/4/16/entrez SP - 324 EP - 9 JF - Movement disorders : official journal of the Movement Disorder Society JO - Mov Disord VL - 13 IS - 2 N2 - Patients with restless leg syndrome (RLS) complain of motor restlessness, usually occurring while they rest in the evening. Two immobilization tests have been described to assess leg restlessness in these patients. In the first test, the patient sits in bed with his or her legs outstretched while electromyograms are recorded from right and left anterior tibialis muscles for an hour (Suggested Immobilization Test [SIT]); in the second test, the legs are immobilized in a stretcher (Forced Immobilization Test [FIT]). In the current study, the SIT and the FIT were compared in patients with RLS and normal control subjects matched for age and sex. More leg movements were seen in patients than in controls during immobilization tests, especially the SIT. These movements were periodic, occurring at a frequency of approximately one every 12 seconds. The SIT (index > 40) was found to discriminate between RLS and control subjects better than the FIT (index > 25). Patients were also recorded during two consecutive nights to measure periodic leg movements in sleep (PLMS). A SIT index greater than 40 and a PLMS index greater than 11 (highest PLMS index of 2 consecutive nights) were found to discriminate patients with RLS from control subjects with similar power. With each of these two measures, the clinical diagnosis was correctly predicted in 81% of patients and 81% of the control subjects. The SIT has several advantages over the measure of the PLMS index; it does not require an all-night polygraphic recording and can be administered several times a day to measure circadian fluctuation of motor restlessness. SN - 0885-3185 UR - https://www.unboundmedicine.com/medline/citation/9539348/Immobilization_tests_and_periodic_leg_movements_in_sleep_for_the_diagnosis_of_restless_leg_syndrome_ L2 - https://doi.org/10.1002/mds.870130220 DB - PRIME DP - Unbound Medicine ER -