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Sequencing sit-to-stand and upright posture for mobility limitation assessment: determination of the timing of the task phases from force platform data

Mazzà, Claudia and Zok, Mounir and Della Croce, Ugo (2005) Sequencing sit-to-stand and upright posture for mobility limitation assessment: determination of the timing of the task phases from force platform data. Gait & Posture, Vol. 21 (4), p. 425-431. ISSN 0966-6362. Article.

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DOI: 10.1016/j.gaitpost.2004.05.006

Abstract

The identification of quantitative tools to assess an individual’s mobility limitation is a complex and challenging task. Several motor tasks have been designated as potential indicators of mobility limitation. In this study, a multiple motor task obtained by sequencing sit-to-stand and upright posture was used. Algorithms based on data obtained exclusively from a single force platform were developed to detect the timing of the motor task phases (sit-to-stand, preparation to the upright posture and upright posture). To test these algorithms, an experimental protocol inducing predictable changes in the acquired signals was designed. Twenty-two young, able-bodied subjects performed the task in four different conditions: self-selected natural and high speed with feet kept together, and self-selected natural and high speed with feet pelvis-width apart.
The proposed algorithms effectively detected the timing of the task phases, the duration of which was sensitive to the four different experimental conditions. As expected, the duration of the sit-to-stand was sensitive to the speed of the task and not to the foot position, while the duration of the preparation to the upright posture was sensitive to foot position but not to speed.
In addition to providing a simple and effective description of the execution of the motor task, the correct timing of the studied multiple task could facilitate the accurate determination of variables descriptive of the single isolated phases, allowing for a more thorough description of the motor task and therefore could contribute to the development of effective quantitative functional evaluation tests.

Item Type:Article
ID Code:6946
Status:Published
Refereed:Yes
Uncontrolled Keywords:Sit-to-stand, upright posture, motor ability assessment, ground reaction forces
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-INF/06 Bioingegneria elettronica e informatica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze biomediche
Publisher:Elsevier
ISSN:0966-6362
Deposited On:12 Jan 2012 11:10

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