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. 2024 Oct 10;6(4):568-577.
doi: 10.3390/clockssleep6040038.

The Validation of the SOMNOwatch™ Actigraphy System for Periodic Limb Movements in Sleep Assessment

Ekaterina Spektor  1 , Ingo Fietze  2 , Mikhail G Poluektov  1
Affiliations

The Validation of the SOMNOwatch™ Actigraphy System for Periodic Limb Movements in Sleep Assessment

Ekaterina Spektor et al. Clocks Sleep. .

Abstract

There is a growing body of evidence regarding the clinical significance of PLMS, and this movement disorder is of concern in both clinical and scientific contexts. Leg actigraphy is a convenient and promising method for screening periodic limb movements in sleep (PLMSs). This study aims to demonstrate the reliability of the SOMNOwatch™ actigraph for detecting periodic limb movements in sleep. Twenty-eight patients, referred to a sleep laboratory for various sleep problems, underwent nocturnal polysomnography with simultaneous one-sided actigraphy using the SOMNOwatch™ actigraph. Recordings of leg movements obtained from both methods were manually scored, calculating the periodic limb movement index (PLMI). The agreement between the methods was assessed through correlation analysis and event-by-event comparison. The correlation between the PLMI derived from PSG and SOMNOwatch™ was high and statistically significant (r = 0.98, p < 0.0001). The SOMNOwatch™ demonstrated a sensitivity of 86.7% and a specificity of 92.3% in detecting PLMS. Similarly, for detecting patients with a PLMI equal to or greater than 15, the sensitivity was 85.7%, and the specificity was 95.2%.

Keywords: SOMNOwatch; actigraphy; periodic limb movements; polysomnography; validation.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be contrued as a potential conflict of interest. The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Actigraphic raw data. The lower section of the window depicts a 5 min epoch with a series of periodic limb movements, while the upper section of the window displays movements throughout the entire night, with PLMS marked in red.
Figure 2
Figure 2
Scatter plot for the measurements of the periodic limb movement index (PLMI) by polysomnography (PSG) and actimetry.
Figure 3
Figure 3
Bland–Altman plot: average PLMI measured via actigraphy and PSG versus the difference in the PLMI of both methods. PLMI—periodic limb movement index; and PSG—polysomnography.
See this image and copyright information in PMC

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