Conclusions
We conclude that the QT and RR intervals show independent responses to various types of stimuli. The spectral and dimension analyses of the RR and QT intervals show characteristic responses both to mental (stress interview) and physical (exercise) perturbations. Such analyses may probe the effects of the forebrain on the heart in such a way as to assess its potentially deleterious impact and thus to predict cardiac risk.
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Negoescu, R., Skinner, J.E. & Wolf, S. Forebrain regulation of cardiac function spectral and dimensional analysis of RR and QT intervals. Integrative Physiological and Behavioral Science 28, 331–342 (1993). https://doi.org/10.1007/BF02690930
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DOI: https://doi.org/10.1007/BF02690930