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Objective Measurement and Characterization of Sleep Benefit in Parkinson's Disease
Author(s) -
Lee Will,
Evans Andrew H.,
Williams David R.
Publication year - 2017
Publication title -
movement disorders clinical practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.754
H-Index - 18
ISSN - 2330-1619
DOI - 10.1002/mdc3.12489
Subject(s) - levodopa , parkinsonism , parkinson's disease , motor function , medicine , disease , physical medicine and rehabilitation , sleep (system call) , morning , movement disorders , psychology , computer science , operating system
Abstract Background Sleep benefit ( SB ) in Parkinson's disease refers to improved motor symptoms upon waking despite an entire night without medications. Although it was first proposed 30 years ago, this phenomenon proved difficult to investigate, and its true prevalence and underlying mechanisms remain unclear. Objective This study aimed to identify and quantify SB through measurement of motor function using a validated smartphone application and to identify disease characteristics that predicted SB . Methods Ninety‐two patients recruited from 2 Movement Disorder Services were clinically assessed at home using a validated smartphone application. Each patient was tested in the on‐state, at the end of dose, and on waking (before medications) 3 times. Differences between the 3 states were used to determine the impact of sleep and levodopa on motor function. SB was considered to be a “measurable improvement in parkinsonism from the end of dose.” Results The morning waking motor function of 20 patients (22%) improved compared with the end‐of‐dose function, with 9 patients demonstrating superior function compared with their on‐state. No clinical features predicted SB . Although all participants subjectively reported motor fluctuations, only 35 patients (38%) demonstrated an objective improvement with levodopa. Patients who had SB more often demonstrated objective motor fluctuations compared with those who did not (65% vs. 31%; P = 0.008). Conclusions SB is a genuine motor phenomenon: 1 in 5 patients have a measurable improvement in motor function on waking. It remains questionable whether this improvement is a direct effect of sleep. Until its underlying mechanism is better understood, it is more appropriate to refer to this phenomenon as simply morning improvement or diurnal fluctuation of motor symptoms.