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Periodic Limb movements

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Periodic Limb movements

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  1. Detecting Periodic Limb Movements with Off-the-shelf AccelerometersAndré Diasa,b,e, Lukas Gorzelniakb,c, JulianeRudnikd, DraganStojanovicd, Alexander Horscha,b,e,faNorwegian Centre for Integrated Care and Telemedicine, University Hospital of North Norway, Tromsø, NorwaybInstitut für Medizinische Statistik und Epidemiologie, Technische Universität München, GermanycInstitute forEpidemiology II, HelmholtzZentrummünchen, German Research Center for Environmental HealthdClinic Bad Reichenhall, Center for Rehabilitation, Pneumology and Orthopedics, GermanyeComputer Science Department, University of Tromsø, NorwayfDepartment of Clinical Medicine, University of Tromsø, Norway

  2. PeriodicLimbmovements • Afectssleepquality • Related to sleepapnea, COPD, hypertension

  3. Gold Standard polysomnography (PSG): lab, expensive, sleep over

  4. Can we use accelerometers? • Cheap, easy to use • Follow up of patients after therapy • Self assessment

  5. Subjects and materials • Two patients at Clinic Bad Reichenhall • PSG: Philips Respironics Alice 5 • Accelerometer: Actigraph GT3X • 30Hz, 3-axis, pre-filtered • Both legs at ankle

  6. Software • code.google.com/p/movyzer/ • Similarity function (1) GT3X Graph (left leg), (2) GT3X Graph (right leg), (3) PSG Graph, (4) Log field, (5) Parameters

  7. Results

  8. Discussion • 8% similarity: far from relevant for medical applications • Other authors have reported underestimation of accelerometers • But we are in contrast • higher sampling: 100hz

  9. Unpublished results

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