Relationship between diabetic autonomic dysfunction and heart rate variability assessed by recurrence plot

Abstract

Beat-to-beat heart rate (HR) and blood pressure were measured by the Finapres system in 44 healthy and 64 diabetic subjects in the at-rest condition. Autonomic control in diabetic subjects was assessed by the Ewing test. HR variability was explored by both linear and nonlinear methods. Linear methods used HR standard deviation and power spectrum. The percentage of the spectrum in the low frequencies was used to assess the sympathetic tone of the autonomic control. The nonlinear method used the "recurrence plot." This method explored long parallel subsequences in the HR time series. These sequences characterize the dependence of the HR dynamics on initial values. The HR standard deviation was reduced in the diabetic subjects compared with the healthy subjects (2.80 +/- 1.17 vs. 3.64 +/- 1.45 beats/min; P < 0.001). In the diabetic subjects, the HR standard deviation and the percentage of the spectrum in the low frequencies showed no correlations with the Ewing score (P > 0.10). In contrast, the longest length index was very strongly correlated to the Ewing score (r = -0.60; P < 0.0001). The results suggest that nonlinear methods might be powerful to explore the autonomic dysfunction in diabetic subjects.

Nonlinear time-course of lumbar muscle fatigue using recurrence quantifications

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‘The effect of different genres of music on the stress levels of kennelled dogs’

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Possibilities and limitations of the polar RS800 in measuring heart rate variability at rest

“…Today, it is rather well established that higher variations of consecutive heartbeat intervals, as well as periodic changes over certain frequencies, are associated with positive health outcomes, whereas lower variations are associated with negative health outcomes. Measures of HRV have for instance been shown to predict cardiovascular disease (Schroeder et al 2003;Liao et al 1996;Singh et al 1998;Arora et al 2004), metabolic disorders (Karason et al 1999;Rodriguez-Colón et al 2010;Liao et al 1995;Singh et al 2000;Mestivier et al 1997), psychological disorders (Rechlin et al 1994;Agelink et al 2002;Miu et al 2009;Yeragani et al 1998;Henry et al 2010; Bar et al 2007;Boettger et al 2006) and death (Korach et al 2001;Haji-Michael et al 2000;Nolan et al 1998;Makikallio et al 2005;La Rovere et al 2003).…”