Poincaré plot indices as measures of sympathetic cardiac regulation: Responses to psychological stress and associations with pre-ejection period.

摘要: Abstract The Poincare plot is a visual representation of the R-R time series within Cartesian plane constructed by plotting each interval as function previous one. can be characterized parameters that quantify standard deviation (SD) short- and long-term variability (SD1 SD2, respectively). Claims regarding use analysis an alternative to conventional time-domain spectral analytic measures parasympathetic contributions heart rate (HRV) have been evaluated somewhat extensively. However, its proposed utility for characterizing sympathetic influences on HRV during periods acute mental stress, using SD2 SD1/SD2 ratio, has received minimal attention. In present study, electrocardiogram was used record in healthy participants resting baseline period, while they performed challenging reaction task, then recovery period. Simultaneously, thoracic impedance cardiogram derive pre-ejection period (PEP), which reflects cardiac control. quantified time-domain, analytic, indices. Task performance elicited significant reductions PEP parameters, indicating withdrawal tone with concomitant activation. Following cessation task performance, all returned levels, signaling resumption dominance. Bivariate associations linking ratio were observed; however, these not large magnitude, exceeded size between metrics markers influences, eliminated when latter controlled statistically. These observations challenge proposal are suitable regulation research concerned physical health.