Detecting Periodic Limb Movements with Off-the-shelf Accelerometers André Dias a,b,e, Lukas Gorzelniak b,c, Juliane Rudnik d, Dragan Stojanovic d, Alexander.

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Detecting Periodic Limb Movements with Off-the-shelf Accelerometers Andr Dias a,b,e, Lukas Gorzelniak b,c, Juliane Rudnik d, Dragan Stojanovic d, Alexander Horsch a,b,e,f a Norwegian Centre for Integrated Care and Telemedicine, University Hospital of North Norway, Troms, Norway b Institut fr Medizinische Statistik und Epidemiologie, Technische Universitt Mnchen, Germany c Institute for Epidemiology II, HelmholtzZentrum mnchen, German Research Center for Environmental Health d Clinic Bad Reichenhall, Center for Rehabilitation, Pneumology and Orthopedics, Germany e Computer Science Department, University of Troms, Norway f Department of Clinical Medicine, University of Troms, Norway Slide 2 Periodic Limb movements Afects sleep quality Related to sleep apnea, COPD, hypertension Slide 3 Gold Standard polysomnography (PSG): lab, expensive, sleep over Slide 4 Can we use accelerometers? Cheap, easy to use Follow up of patients after therapy Self assessment Slide 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 Slide 6 Software code.google. com/p/movy zer/ Similarity function (1) GT3X Graph (left leg), (2) GT3X Graph (right leg), (3) PSG Graph, (4) Log field, (5) Parameters Slide 7 Results Slide 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Other authors have reported underestimation of accelerometers But we are in contrast higher sampling: 100hz Slide 9 Unpublished results