Methods Inf Med - Personal adaptive method to assess mental tension during daily life using heart rate variability.


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JECTIVES: The aim of this study is to present a method of assessing psychological tension that is optimized to every individual on the basis of the heart rate variability (HRV) data which, to eliminate the influence of the inter-individual variability, are measured in a long time period during daily life.METHODS: HRV and body accelerations were recorded from nine normal subjects for two months of normal daily life. Fourteen HRV indices were calculated with the HRV data at 512 seconds prior to the time of every mental tension level report. Data to be analyzed were limited to those with body accelerations of 30 mG (0.294 m/s?) and lower. Further, the differences from the reference values in the same time zone were calculated with both the mental tension score (tension) and HRV index values (HRVI). The multiple linear regression model that estimates tension from the scores for principal components of HRVI were then constructed for each individual. The data were divided into training data set and test data set in accordance with the twofold cross validation method. Multiple linear regression coefficients were determined using the training data set, and with the optimized model its generalization capability was checked using the test data set.RESULTS: The subjects' mean Pearson correlation coefficient was 0.52 with the training data set and 0.40 with the test data set. The subjects' mean coefficient of determination was 0.28 with the training data set and 0.11 with the test data set.CONCLUSION: We proposed a method of assessing psychological tension that is optimized to every individual based on HRV data measured over a long period of daily life.

Resumo Limpo

jectiv aim studi present method assess psycholog tension optim everi individu basi heart rate variabl hrv data elimin influenc interindividu variabl measur long time period daili lifemethod hrv bodi acceler record nine normal subject two month normal daili life fourteen hrv indic calcul hrv data second prior time everi mental tension level report data analyz limit bodi acceler mg ms lower differ refer valu time zone calcul mental tension score tension hrv index valu hrvi multipl linear regress model estim tension score princip compon hrvi construct individu data divid train data set test data set accord twofold cross valid method multipl linear regress coeffici determin use train data set optim model general capabl check use test data setresult subject mean pearson correl coeffici train data set test data set subject mean coeffici determin train data set test data setconclus propos method assess psycholog tension optim everi individu base hrv data measur long period daili life

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