The measurement of tremor using a velocity transducer: comparison to simultaneous recordings using transducers of displacement, acceleration and muscle activity
Identifieur interne : 003694 ( Main/Exploration ); précédent : 003693; suivant : 003695The measurement of tremor using a velocity transducer: comparison to simultaneous recordings using transducers of displacement, acceleration and muscle activity
Auteurs : Kathleen E. Norman [Canada] ; Roderick Edwards [Canada] ; Anne Beuter [Canada]Source :
- Journal of Neuroscience Methods [ 0165-0270 ] ; 1999.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme.
English descriptors
- KwdEn :
- Acceleration, Adult, Aged, Biomechanical Phenomena, Body movement, Case-Control Studies, Displacement, EMG, Electromyography, Electromyography (instrumentation), Electromyography (methods), Female, Fingers (physiology), Human, Humans, Lasers, Male, Measurement method, Middle Aged, Muscle contraction, Parkinson Disease (diagnosis), Parkinson disease, Parkinson’s disease, Transducers, Tremor, Tremor (diagnosis), Velocity.
- MESH :
- diagnosis : Parkinson Disease, Tremor.
- instrumentation : Electromyography.
- methods : Electromyography.
- physiology : Fingers.
- Acceleration, Adult, Aged, Biomechanical Phenomena, Case-Control Studies, Female, Humans, Lasers, Male, Middle Aged, Transducers.
Abstract
Precise kinematic measurements of tremor have historically been obtained using accelerometers. However, current technology permits precise measurements in velocity and displacement. The primary advantage of velocity recording is that only one step of integration or differentiation is required for either displacement or acceleration. A method is presented of measuring finger tremor using a laser system that transduces velocity precisely. Measurements of postural finger tremor thus obtained were compared to those simultaneously obtained from a laser system that transduces displacement, from an accelerometer and from surface electromyography (EMG) of the extensor digitorum communis. A range of amplitude and frequency content was obtained by testing control subjects and subjects with Parkinson’s disease. The velocity transducer showed excellent correspondence of amplitude and frequency measurement with the displacement transducer. Measures of absolute and relative amplitude correlated well (r≥0.96 in amplitude measures in displacement, velocity and acceleration), and high coherence was found throughout the frequency range of interest. Measurements by the accelerometer generally showed poorer correspondence with those of the other instruments. EMG measurements showed good correspondence in some trials but poorer correspondence in others, attributed to the low level of muscle activity required in the task. Precise kinematic measurements appear to be highly sensitive to neuromotor impairment.
Url:
DOI: 10.1016/S0165-0270(99)00091-6
Affiliations:
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Le document en format XML
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However, current technology permits precise measurements in velocity and displacement. The primary advantage of velocity recording is that only one step of integration or differentiation is required for either displacement or acceleration. A method is presented of measuring finger tremor using a laser system that transduces velocity precisely. Measurements of postural finger tremor thus obtained were compared to those simultaneously obtained from a laser system that transduces displacement, from an accelerometer and from surface electromyography (EMG) of the extensor digitorum communis. A range of amplitude and frequency content was obtained by testing control subjects and subjects with Parkinson’s disease. The velocity transducer showed excellent correspondence of amplitude and frequency measurement with the displacement transducer. Measures of absolute and relative amplitude correlated well (r≥0.96 in amplitude measures in displacement, velocity and acceleration), and high coherence was found throughout the frequency range of interest. Measurements by the accelerometer generally showed poorer correspondence with those of the other instruments. EMG measurements showed good correspondence in some trials but poorer correspondence in others, attributed to the low level of muscle activity required in the task. Precise kinematic measurements appear to be highly sensitive to neuromotor impairment.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Québec</li></region><settlement><li>Montréal</li></settlement><orgName><li>Université du Québec à Montréal</li></orgName></list><tree><country name="Canada"><region name="Québec"><name sortKey="Norman, Kathleen E" sort="Norman, Kathleen E" uniqKey="Norman K" first="Kathleen E" last="Norman">Kathleen E. Norman</name></region><name sortKey="Beuter, Anne" sort="Beuter, Anne" uniqKey="Beuter A" first="Anne" last="Beuter">Anne Beuter</name><name sortKey="Edwards, Roderick" sort="Edwards, Roderick" uniqKey="Edwards R" first="Roderick" last="Edwards">Roderick Edwards</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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