S.P.8 Validation of linear accelerations and angular velocities to estimate the efficacy of a subject when performing a quantified task in a controlled environment

Autor: T. Voit, A.G. Le Moing, A. Totoescu, David Vissiere, Patrick Berquin, L. Sinègre, L. Servais, J.Y. Hogrel, Amélie Moraux
Rok vydání: 2012
Předmět:
Zdroj: Neuromuscular Disorders. 22:877-878
ISSN: 0960-8966
DOI: 10.1016/j.nmd.2012.06.247
Popis: The need for measures specifically designed to assess the muscle strength and activity of upper limbs of non-ambulatory patients with neuromuscular diseases is a major challenge. Aiming for a regular monitoring of the natural history of these patients, and trying to provide a powerful system for quantitative measurements, a movement Holter monitor is being developed in France at the Institute of Myology in collaboration with SYSNAV Company. The device consists of a watch equipped with sensors and specific software. The measuring principle is based on the use of Micro-Electro-Mechanical Systems inertial sensors and magnetometers operated through magneto-inertial equations. The issue lies in determining reliable variables representing the physical muscle level and in quantification of movement of non-ambulatory patients from the signals recorded by sensors: angular velocity, magnetic field and linear acceleration in 3D. In a preliminary study, we used a wired prototype to record healthy subjects performing Box and Block test. For each task, the exponential regression between the obtained task score and the activity levels as estimated by different computing of recorded linear acceleration and angular velocity indicate a strong correlation ( R 2 from 0.95 to 0.97). The results from other tests like Minnesota (score), computer typing (number of characters) and number of a standardized movement mimicking spoon elevation to mouth similarly showed strong correlation R 2 ranging from 0.88 to 0.96. These data demonstrate that variables issued from the computing of linear acceleration and angular velocities may predict the efficacy of a subject in a quantified task performed in a controlled environment. We therefore produce a wireless prototype that is now being evaluated in non-ambulatory patients at home.
Databáze: OpenAIRE
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