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http://dx.doi.org/10.14695/KJSOS.2018.22.3.21

A Study of Intrinsic Alpha Rhythm, Electroencephalography, and Heart Rate Variability Index as Indicators of Cognitive Function and Health in Elderly Adults  

Shim, Jun-Young (국제뇌교육종합대학원대학교 뇌교육학과)
Publication Information
Science of Emotion and Sensibility / v.22, no.3, 2019 , pp. 21-34 More about this Journal
Abstract
This study was an examination of the relevance and clinical significance of electroencephalographic (EEG) indexes (e.g., mental/physical stress and attention) and indexes of heart rate variability (HRV) with regard to cognitive function and physiological health conditions in elderly people. A device was used to record two-channel EEGs of the frontal lobe and a one-channel ECG simultaneously. Subjects were 76 people average aged 73. The significant findings are as follows: First, subjects whose intrinsic alpha rhythm had high amplitude, regardless of peak, showed higher resistance to mental stress and lower physical stress than did subjects with low-amplitutde intrinsic alpha rhythm. Second, HRV, SDNN, and RMSSD indexes showed strong positive correlations between the two groups of subjects regardless of the division of groups. Third, the alpha asymmetry of the left and right sides of the brain in subjects with low-amplitude intrinsic alpha rhythm was larger, and the delta/alpha ratio (reflecting physical stress) and theta/sensorimotor rhythm (SMR) ratio (showing the decline in attention) were bigger. Fourth, the subjects in whom intrinsic alpha rhythm peak occurred during slow rhythm had a higher theta/SMR ratio than did subjects whose peak occurred during fast rhythm, which was related to a steeper decline in attention. Therefore, the presence or absence of intrinsic alpha rhythm peak and amplitude on quantitative EEG may be an index reflecting the cognitive function and physiological health of elderly people.
Keywords
Elderly; Cognitive Function; EEG; Alpha Intrinsic Rhythm; HRV;
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