Comput Math Methods Med - Cardiorespiratory dynamic response to mental stress: a multivariate time-frequency analysis.

Tópicos

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Resumo

Mental stress is a growing problem in our society. In order to deal with this, it is important to understand the underlying stress mechanisms. In this study, we aim to determine how the cardiorespiratory interactions are affected by mental arithmetic stress and attention. We conduct cross time-frequency (TF) analyses to assess the cardiorespiratory coupling. In addition, we introduce partial TF spectra to separate variations in the RR interval series that are linearly related to respiration from RR interval variations (RRV) that are not related to respiration. The performance of partial spectra is evaluated in two simulation studies. Time-varying parameters, such as instantaneous powers and frequencies, are derived from the computed spectra. Statistical analysis is carried out continuously in time to evaluate the dynamic response to mental stress and attention. The results show an increased heart and respiratory rate during stress and attention, compared to a resting condition. Also a fast reduction in vagal activity is noted. The partial TF analysis reveals a faster reduction of RRV power related to (3s) than unrelated to (30s) respiration, demonstrating that the autonomic response to mental stress is driven by mechanisms characterized by different temporal scales.

Resumo Limpo

mental stress grow problem societi order deal import understand under stress mechan studi aim determin cardiorespiratori interact affect mental arithmet stress attent conduct cross timefrequ tf analys assess cardiorespiratori coupl addit introduc partial tf spectra separ variat rr interv seri linear relat respir rr interv variat rrv relat respir perform partial spectra evalu two simul studi timevari paramet instantan power frequenc deriv comput spectra statist analysi carri continu time evalu dynam respons mental stress attent result show increas heart respiratori rate stress attent compar rest condit also fast reduct vagal activ note partial tf analysi reveal faster reduct rrv power relat s unrel s respir demonstr autonom respons mental stress driven mechan character differ tempor scale

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