Periodic limb movement disorder (PLMD) is a condition in which a person's
legs, and sometimes arms, move repetitively and uncontrollably while he or she
is asleep. These episodes of limb movement can disrupt the person's sleep,
causing insomnia or daytime sleepiness. Periodic limb movement symptoms are
only thought to be a disorder (PLMD) when insomnia or daytime sleepiness cannot be
explained by any other problem, such as
restless legs syndrome. Recently, it has been found
that these movements are often linked to subtle breathing problems.
The exact cause of PLMD is
PLMD shares many underlying factors with restless legs
syndrome, such as a hereditary link, iron deficiency anemia, nerve problems,
poor blood circulation in the legs, kidney disorders, and others. But in
general the two conditions are seen as being related rather than as causing one
People with PLMD
have trouble falling or staying asleep (insomnia) or they feel sleepy during
the day because the movements disrupt their sleep. These movements usually are
in the legs and occur in some type of pattern. Although a person often is not
fully awakened by these movements, they interfere with normal sleep cycles. A
bed partner's sleep may also be disrupted.
PLMD is diagnosed with a
medical history, often including a sleep history from a bed partner, and a
physical exam. A sleep study is usually required to detect the movements. A
sleep study also can identify other conditions that may be causing symptoms,
sleep apnea or other subtle breathing problems that
may be causing movements.
Many questions remain about the nature
of periodic leg movements and PLMD. Some researchers consider the movements to
be normal. At least a few movements may occur during sleep in people who do not
have restless legs syndrome, especially in the elderly.
Managing symptoms of PLMD
Other Works Consulted
American Academy of Sleep Medicine (2005). Periodic limb movement disorder. In International Classification of Sleep Disorders, 2nd ed., pp. 182–186. Westchester, IL: American Academy of Sleep Medicine.
Buysse DJ, et al. (2008). Sleep disorders. In RE Hales et al., eds., American Psychiatric Publishing Textbook of Psychiatry, 5th ed., pp. 921–969. Washington, DC: American Psychiatric Publishing.
Esteves AM, et al. (2009). Effect of acute and chronic physical exercise on patients with periodic leg movements. Medicine and Science in Sports and Exercise, 41(1): 237–242.
Lesage S, Hening WA (2004). The restless legs syndrome and periodic limb movement disorder: A review of management. Seminars in Neurology, 24(3): 249–259.
March 10, 2011
Anne C. Poinier, MD - Internal Medicine
& Colin Chalk, MD, CM, FRCPC - Neurology
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