Response to Active Standing of Heart Beat Interval, Systolic Blood Volume and Systolic Blood Pressure: Recurrence Plot Analysis
Por:
González H., Infante O., Lerma C.
Publicada:
1 ene 2014
Resumen:
Recurrence quantitative analysis (RQA) indexes of beat-to-beat
heart-beat interval and systolic blood pressure (SBP) have helped to
understand the dynamical response to active standing. The peripheral
blood volume is another variable of the cardiovascular control system
with a crucial role during active standing since re-distribution of
blood volume is necessary to counteract the gravity force and to provide
enough blood supply to vital organs. Beat-to-beat photoplethysmographic
systolic blood volume (SBV) oscillations may be useful to study the
cardiovascular control if it is considered as a regulatory system with
relevant local differences compared to blood pressure regulation. There
are no previous reports of the SBV dynamical response to active
standing. In this work we study simultaneously the dynamical response of
heart-beat interval, SBP and SBV to active standing through comparison
of RQA indexes evaluated during supine position and during active
standing in 19 healthy volunteers. We show that in response to
orthostatic stress, SBV oscillations have dynamic changes similar, but
not identical, to SBP and the heart-beat interval. This suggests that
these three variables are complementary for a better evaluation of the
cardiovascular dynamics.
Filiaciones:
Laboratorio de Biofísica de Sistemas Excitables, Universidad Nacional Autónoma de México, Av. Universidad 3000, Tlalpan, 04510, Mexico
Departamento de Instrumentación Electromecánica, Instituto Nacional de Cardiología Ignacio Chávez, Juan Badiano 1, Tlalpan, 14080, Mexico
|