B Kemp1, A J Janssen, B van der Kamp. 1. Department of Neurology and Clinical Neurophysiology, University Hospital Leiden, The Netherlands. kemp@rullf2.leidenuniv.nl
Abstract
OBJECTIVES: The study and diagnosis of movement disorders can be improved by monitoring body position simultaneously with the EMG. METHODS: We developed a monitor of the 3-dimensional (3D) orientation of body parts that can be applied in long-term ambulatory recordings in the daily life of a patient. The 3D sensor combines miniature sensors for earth's gravity and magnetism. It measures 60 x 50 x 10 mm and draws less than 1 mA of current from +/-5 V battery power. The non-horizontal direction of earth magnetism, as well as torque (pronation) of the body part, is corrected mathematically. RESULTS: This results in a measurement of the 3D orientation of a body part in terms of vertical inclination and horizontal azimuth. CONCLUSIONS: Calibration measurements indicate that this method is fairly accurate and practically applicable.
OBJECTIVES: The study and diagnosis of movement disorders can be improved by monitoring body position simultaneously with the EMG. METHODS: We developed a monitor of the 3-dimensional (3D) orientation of body parts that can be applied in long-term ambulatory recordings in the daily life of a patient. The 3D sensor combines miniature sensors for earth's gravity and magnetism. It measures 60 x 50 x 10 mm and draws less than 1 mA of current from +/-5 V battery power. The non-horizontal direction of earth magnetism, as well as torque (pronation) of the body part, is corrected mathematically. RESULTS: This results in a measurement of the 3D orientation of a body part in terms of vertical inclination and horizontal azimuth. CONCLUSIONS: Calibration measurements indicate that this method is fairly accurate and practically applicable.
Authors: Johan Bäckman; Arne Andersson; Lykke Pedersen; Sissel Sjöberg; Anders P Tøttrup; Thomas Alerstam Journal: J Comp Physiol A Neuroethol Sens Neural Behav Physiol Date: 2017-03-25 Impact factor: 1.836