The effect of changes in joint angle on the characteristics of physiological tremor |
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| Authors: | Benoit Carignan Jean-François Daneault Christian Duval |
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| Affiliation: | 1. Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada;2. Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada;3. Département de Kinanthropologie, Université du Québec à Montréal, Montréal, Québec, Canada;1. Professor and Surgeon, Department for Foot and Ankle Surgery, Rummelsberg and Nuremberg, Germany;2. Head Attending Surgeon, Department for Foot and Ankle Surgery, Rummelsberg and Nuremberg, Germany;3. Surgeon, Department for Foot and Ankle Surgery, Rummelsberg and Nuremberg, Germany;1. Department of Biomedical Engineering, Duke University, Durham, NC, USA;2. Department of Neurosurgery, Emory University Hospital, Atlanta, GA, USA;3. Department of Neurobiology, Duke University Medical Center, Durham, NC, USA;4. Department of Neurosurgery, Duke University Medical Center, Durham, NC, USA;5. Department of Electrical and Computer Engineering, Duke University, Durham, NC, USA;1. Nuclear Physics Institute, 250 68 ?e?, Czech Republic;2. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany;3. Institute of Experimental and Applied Physics, Czech Technical University in Prague, Horská 3a/22, 128 00 Praha 2, Czech Republic;4. Institute for Advanced Simulation (IAS-4), Institut für Kernphysik (IKP-3) and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany;1. Principal Engineer, Centre for Development of Advanced Computing, Plot-E2/1, Block-GP, Sector-V, Salt Lake City, Kolkata-700 091, India;2. Project Engineer-I, Centre for Development of Advanced Computing, Plot-E2/1, Block-GP, Sector-V, Salt Lake City, Kolkata-700 091, India |
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| Abstract: | IntroductionPhysiological tremor, as a whole, can be influenced by changes in muscle activity. However, the origin of low-frequency physiological tremor oscillations has yet to be conclusively determined. It is possible that by experimentally manipulating muscular activity, a better determination of the origin of those low-frequency oscillations can be achieved. It was demonstrated that changes in joint angle modify characteristics of muscular activity. As such, we hypothesize that changes in wrist-joint angle will alter the characteristics of low-frequency physiological tremor oscillations.ObjectiveAssess the influence of changes in joint angle of the wrist on characteristics of physiological finger tremor.MethodsPhysiological finger tremor was recorded (n = 25) using a laser displacement system while the arm and hand were supported. The relative angle between the dorsum of the hand and the forearm was altered between conditions (135°, 180°, 225° and 270°), while the hand and the finger remained parallel to the ground. EMG of the extensors and flexors were also recorded.ResultsTremor amplitude was significantly altered by changes in wrist-joint angle. This was especially the case for lower frequency oscillations. In addition, electromyography properties of forearm muscles were also significantly modified by changes in wrist-joint angles.ConclusionsThis study demonstrates that changes in wrist-joint angle modify the characteristics of physiological finger tremor. This should be taken into account when interpreting tremor data as well as when developing tools to minimize tremor. |
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