Periodic Limb Movements in Sleep: Prevalence and Associated Sleepiness in the Wisconsin Sleep Cohort

Periodic limb movements in sleep (PLMS)1 are repetitive bursts of muscle activity, typically in the lower limbs, which may be accompanied by an arousal or sleep fragmentation(Pollmacher et al., 1993). Although PLMS are believed to increase with age(Ancoli-Israel et al., 1985, Ferri et al., 2008), until recently, the prevalence of PLMS in the general population had not been reliably estimated. Small studies have reported prevalence rates between 5 and 11%(Hornyak et al., 2006, Scofield et al., 2008), including a community-based sample of 592 participants recruited from the general population of tri-country Detroit which reported 7.6% (Hornyak et al., 2006, Scofield et al., 2008).

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