The KickStrip: a novel testing device for periodic limb movement disorder

Area of Science:

• Sleep Medicine
• Neurology
• Biomedical Engineering

Background:

• The clinical significance and monitoring of periodic limb movement disorder (PLMD) remain debated.
• Overnight polysomnography is the traditional method for PLMD assessment.
• There is a need for accessible and portable PLMD testing solutions.

Purpose of the Study:

• To introduce and validate a novel, portable, low-cost device, the KickStrip, for PLMD testing.
• To compare the KickStrip's performance against the traditional periodic limb movement index (PLMI).

Main Methods:

• Eighty-two patients referred for sleep disturbance underwent simultaneous polysomnography and KickStrip monitoring.
• The KickStrip final score (Kscore) was compared with the PLMI derived from overnight recordings.
• Statistical analyses included Pearson correlations, sensitivity/specificity, ROC curves, and Bland-Altman plots.

Main Results:

• Kscores demonstrated strong correlations with PLMI (r = 0.83–0.88, p < 0.001).
• Sensitivity ranged from 50% to 100%, and specificity from 83% to 100% for increasing PLMD thresholds.
• Receiver operating characteristic curves showed high area-under-the-curve values (82%–92%), indicating excellent agreement.

Conclusions:

• The KickStrip shows increased accuracy with PLMD severity and excellent agreement with the traditional PLMI.
• The KickStrip is a validated, valuable tool for PLMD testing.
• This device has potential applications in both clinical practice and research settings.