Gait analysis under dual-task conditions for identifying motor phenotypes in elderly patients with gait disorders - 21/09/16
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Résumé |
Objective |
Gait disorders are associated with increased fall risk, dementia and loss of autonomy. Gait analysis has previously been validated in the identification of motor phenotypes in mild cognitive impairment [1]. We hypothesized that gait analysis under dual-task conditions in elderly patients with gait disorders might allow the identification of motor phenotypes linked to specific brain abnormalities.
Material/patients and methods |
An observational study was instructed for elderly patients with gait disorders or memory impairment. Gait analysis under dual-task conditions was carried out for all patients (Locometrix®). Two main gait variables were measured: stride frequency, and stride regularity. For each gait variable, the dual task cost, which is related to cognitive reserve (DTC (%)) was calculated as follows: [DTC %=(single-task gait value–dual task gait value)/single-task gait value×100]. Brain MRI was carried out in the absence of contra-indications. Semi-quantitative score for white matter hyper intensities (age-related white matter changes, ARWMC) and hippocampus atrophy (Scheltens) were identified.
Results |
One hundred and three patients (mean age 76.3±7.2, women 56%) were included. Four clinical subgroups were identified: gait instability (45%), recurrent falls (29%), memory impairment (18%), and cautious gait (8%). The quartile analysis of DTC for stride frequency and stride regularity allowed the identification of 3 motor phenotypes (<0.01KW), with no link to either sex or clinical subgroups, but characterized by different Scheltens scores (P=0.05). Twenty-six patients with a low value of DTC for stride frequency and a high value of DTC for Stride Regularity (Scheltens 2.6±1.6). Forty-seven patients with the same value of DTC for both stride frequency and regularity (Scheltens 3.3±1.6). 30 patients with a high value of DTC for stride frequency and a low value of DTC for stride regularity (Scheltens 4.0±1.9).
Discussion–conclusion |
The identification of different motor phenotypes in elderly patients with gait disorders can help the clinician with diagnoses and tailored cognitivo-motor gait rehabilitation.
Le texte complet de cet article est disponible en PDF.Keywords : Gait disorders, Elderly, Gait analysis, Dual task paradigm, Motor phenotypes
Plan
Vol 59 - N° S
P. e99-e100 - septembre 2016 Retour au numéro
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