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Measurement of stand-sit and sit-stand transitions using a miniature gyroscope and its application in fall risk evaluation in the elderly

Najafi, Bijan
Aminian, Kamiar
Robert, Philippe A
Published in IEEE Transactions on Biomedical Engineering. 2002, vol. 49, no. 8, p. 843-51
Abstract A new method of evaluating the characteristics of postural transition (PT) and their correlation with falling risk in elderly people is described. The time of sit-to-stand and stand-to-sit transitions and their duration were measured using a miniature gyroscope attached to the chest and a portable recorder placed on the waist. Based on a simple model and the discrete wavelet transform, three parameters related to the PT were measured, namely, the average and standard deviation of transition duration and the occurrence of abnormal successive transitions (number of attempts to have a successful transition). The comparison between two groups of elderly subjects (with high and low fall-risk) showed that the computed parameters were significantly correlated with the falling risk as determined by the record of falls during the previous year, balance and gait disorders (Tinetti score), visual disorders, and cognitive and depressive disorders (p < 0.01). In this study, the wavelet transform has provided a powerful technique for enhancing the pattern of PT, which was mainly concentrated into the frequency range of 0.04-0.68 Hz. The system is especially adapted for long-term ambulatory monitoring of elderly people.
Keywords Accidental Falls/prevention & controlAge FactorsAged/physiologyAlgorithmsBiomechanical PhenomenaEquipment DesignFemaleHumansMaleModels, BiologicalMovement/physiologyPhysical and Rehabilitation Medicine/instrumentationPosture/physiologyRisk Assessment/methodsRisk FactorsSensitivity and SpecificitySignal Processing, Computer-AssistedTransducers
PMID: 12148823
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Research group Chirurgie orthopédique et traumatologique (98)
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NAJAFI, Bijan et al. Measurement of stand-sit and sit-stand transitions using a miniature gyroscope and its application in fall risk evaluation in the elderly. In: IEEE Transactions on Biomedical Engineering, 2002, vol. 49, n° 8, p. 843-51. doi: 10.1109/TBME.2002.800763 https://archive-ouverte.unige.ch/unige:46461

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Deposited on : 2015-02-05

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