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• W2897360707 abstract "Cognitive-motor dual-tasking places demands on attentional resources and represents increasing cognitive challenge with aging and cognitive impairment. We previously proposed a dual-task assessment, based exclusively on upper-extremity motion to identify older adults with cognitive impairments. However, the difficulty of the cognitive task, and its impact on cognitive outcomes, remain unclear. In this study, we investigated the effect of cognitive task difficulty (counting backwards by one and by three) using our novel and validated upper-extremity function (UEF) test of rapidly repeated elbow flexion and extension. Community-dwelling adults (≥65 years) were recruited. Cognitive status was measured using the Montreal Cognitive Assessment (MoCA). Participants performed the UEF using repetitive elbow flexions at their maximum pace: once single-task, once while counting backward by ones (Dual-task 1), and once by threes (Dual-task 2). UEF parameters were measured using wearable sensors applied at the wrist and forearm. Parameters were compared between cognitively impaired (MoCA<20) and healthy groups (MoCA 20 and above) using analysis of variance (ANOVA) tests, controlling for age, sex, and body mass index (BMI). Using UEF parameters with significant differences between groups, we developed logistic regression models to predict cognitive status. To compare models, we calculated sensitivity, specificity, and area under curve (AUC) for receiver operating characteristics (ROC). A total of 150 older adults were recruited (mean age: 81 ± 9). Based on MoCA, 15 (10%) were cognitively impaired. Speed variability (p ≤ 0.0001), range of motion variability (p ≤ 0.0001), and age (p ≤ 0.01) were selected as independent variables for predicting cognition status. Sensitivity, specificity, and AUC for Dual-task 1 were 66%, 89%, and 0.81, respectively. The corresponding values for Dual-task 2 were 83%, 86% and 0.88, respectively. Our results showed counting backwards by three, compared to one, was a superior and more sensitive dual-task cognitive challenge for revealing older adult cognitive status. The combination of skill-learning in working memory (UEF) and counting backwards by three seem to create a stress test for the brain to reveal its impairments. Confirmation via fMRI brain imaging and neuropsychology correlates are required to validate this hypothesis in future studies." @default.
• W2897360707 created "2018-10-26" @default.
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• W2897360707 date "2018-07-01" @default.
• W2897360707 modified "2023-10-16" @default.
• W2897360707 title "P4‐029: ASSESSING COGNITION USING DUAL‐TASK MOTOR FUNCTION: THE INFLUENCE OF COGNITIVE TASK TYPE" @default.
• W2897360707 doi "https://doi.org/10.1016/j.jalz.2018.06.2431" @default.
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