Short-term cardiovascular control, comprising cardiac baroreflex and mechanisms governing cardiac contractility and vascular properties, links heart period (HP) and systolic arterial pressure (SAP) fluctuations. It is activated during postural challenge and this activation is traditionally quantified via linear tools such as HP-SAP squared coherence function. In this study the ability of a nonlinear bivariate tool based on joint symbolic analysis (JSA) approach was tested against HP-SAP coherence function during orthostatic challenge in recreational athletes. We studied 9 men healthy cycling practitioners (age: 20-40 yrs) at rest in supine condition (REST) and during active standing (STAND). The JSA method is based on the definition of symbolic HP and SAP patterns and on the evaluation of the rate of their simultaneous occurrence in both HP and SAP series. HP-SAP squared coherence was computed in the low frequency band (LF, from 0.04 to 0.15 Hz). We found the expected response to the postural stimulus, namely the increase of sympathetic modulation and the contemporaneous vagal withdrawal. However, only JSA was able to detect the expected increase of association between HP and SAP variability series over slow time scales. This result suggests that recreational athletes have more relevant nonlinear interactions between HP and SAP that might be missed by traditional linear tools and might require nonlinear tools to be efficiently described.
Assessment of the coupling strength of cardiovascular control via joint symbolic analysis during postural challenge in recreational athletes / R.M. Abreu, A.M. Catai, B. Cairo, P. Rehder-Santos, B. De Maria, E. Vaini, V. Bari, A. Porta (IEEE ENGINEERING IN MEDICINE AND BIOLOGY ... ANNUAL CONFERENCE PROCEEDINGS). - In: 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)[s.l] : IEEE Press, 2019. - ISBN 9781538613115. - pp. 2011-2014 (( Intervento presentato al 41. convegno Annual International Conference of the IEEE EMBS tenutosi a Berlin nel 2019.
|Titolo:||Assessment of the coupling strength of cardiovascular control via joint symbolic analysis during postural challenge in recreational athletes|
|Settore Scientifico Disciplinare:||Settore ING-INF/06 - Bioingegneria Elettronica e Informatica|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/EMBC.2019.8857213|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|