Why the study?
Methods for diagnosing functional disturbances in systems' interactions using nonlinear analysis allow detection of deviations in internal system operation before morphological changes appear.
For practical studies evaluating cardiovascular autonomic control via phase synchronization of HRV and PPGV, experimental records of at least 10 minutes are recommended to achieve a standard deviation of the estimate below 10%.
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Karavaev et al. (2018) studied this question.
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