Assessment of the sympatho-vagal interaction in central serous chorioretinopathy measured by power spectral analysis of heart rate variability

Measuring heart rate variability in horses to investigate the autonomic nervous system activity – Pros and cons of different methods

“…The biological explanation of LF spectral power, however, is controversial (Goldstein et al, 2011). Some scientists interpret LF components as a meaningful marker of SNS activity (Bernasconi et al, 1998;Bachmann et al, 2003;Rietmann et al, 2004a,b), while others consider changes in LF range as corresponding to both parasympathetic and sympathetic influences (Jokkel et al, 1995;Kuwahara et al, 1996;Ohmura et al, 2001;von Borell et al, 2007). Goldstein et al (2011) even posit that LF power measures are affected by changes in cardiac autonomic outflows due to baroreceptor reflexes and merely indirectly reflect cardiac sympathetic tone.…”

“…These thresholds have been used in a number of studies (see Table 2), although other thresholds have been applied as well (Witte, 2001;Rietmann et al, 2004b;Cottin et al, 2005;von Borell et al, 2007). Rietmann et al (2004b) and Witte (2001) defined their own thresholds with human-derived algorithms (Bernasconi et al, 1998) based on counted respiratory frequency. Individual frequency band thresholds vary as a function of current physiological condition (von Borell et al, 2007) and frequency-band thresholds Kuwahara et al (1996) LF >0.01-0.07 Hz HF >0.07-0.6 Hz Hada et al (2006), Hoffmann (2008, Kato et al (2003), Kuwahara et al (1998Kuwahara et al ( , 1999, Marchant-Forde (2003), Matsuura et al (2010), Minero et al (2006), Oel et al (2010Oel et al ( , 2014, Ohmura et al (2001Ohmura et al ( , 2006aOhmura et al ( ,b, 2012a, Physick-Sheard et al (2000), Uhlendorf (2009) should not be defined without pharmacological blockade of the ANS (Marchant-Forde, 2003), because these defined frequency bands combine individual variations.…”

CRPS I: Erhöhte Sympathikusaktivität in der Spektralanalyse der Herzfrequenzvariabilität

“…Der normale LF / HF-Quotient betr ä gt ca. 1,5 [5] . Stress f ü hrt zum Ansteigen der LF und des LF / HF-Quotienten [28,31] .…”