Decreased chaos after exercise in cardiac output time series of rats: a preliminary report

Yeragani, Vikram K.; Collins, Heidi L.; Rao, K. A. Radhakrishna; Rodenbaugh, David W.; DiCarlo, Stephen E.

doi:10.1016/s1468-1218(02)00023-8

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…Thus, endurance exercise training may have a protective effect on the vascular system. We have also shown a significant decrease in the LLE of cardiac output time series in rats after endurance exercise training, which again suggests decreased chaos in some cardiac measures with exercise [Yeragani et al, 2003a]. Our previous findings on spectral analysis of HR suggest that patients with panic disorder have a relative decrease in cardiac vagal and a relative increase in cardiac sympathetic activity [Yeragani et al, 1992[Yeragani et al, , 1993a[Yeragani et al, , 1998a.…”

Section: Discussionsupporting

confidence: 66%

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Linear and nonlinear measures of blood pressure variability: Increased chaos of blood pressure time series in patients with panic disorder

et al. 2004

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Arterial blood pressure (BP) variability increases progressively with the development of hypertension and an increase in BP variability is associated with end organ damage and cardiovascular morbidity. On the other hand, a decrease in heart rate (HR) variability is associated with significant cardiovascular mortality. There is a strong association between cardiovascular mortality and anxiety. Several previous studies have shown decreased HR variability in patients with anxiety. In this study, we investigated beat-to-beat variability of systolic and diastolic BP (SBP and DBP) in normal controls and patients with panic disorder during normal breathing and controlled breathing at 12, and 20 breaths per minute using linear as well as nonlinear techniques. Finger BP signal was obtained noninvasively using Finapres. Standing SBPvi and DBP BPvi (log value of BP variance corrected for mean BP divided by HR variance corrected for mean HR) were significantly higher in patients compared to controls. Largest Lyapunov exponent (LLE) of SBP and DBP, a measure of chaos, was significantly higher in patients in supine as well as standing postures. The ratios of LLE (SBP/HR) and LLE (DBP/HR) were also significantly higher (P<.001) in patients compared to controls. These findings further suggest dissociation between HR and BP variability and a possible relative increase in sympathetic function in anxiety. This increase in BP variability may partly explain the increase in cardiovascular mortality in this group of patients.

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Section: Discussionsupporting

confidence: 66%

“…Recently we also showed that the time series of cardiac output (CO) are chaotic in nature and that LLE of these time series also decreases significantly after endurance exercise training in rats, which may be due to a decrease in sympathetic activity [Yeragani et al, 2003a].…”

Section: Introductionmentioning

confidence: 98%

Linear and nonlinear measures of blood pressure variability: Increased chaos of blood pressure time series in patients with panic disorder

et al. 2004

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Detecting high-dimensional determinism in time series with application to human movement data

Ramdani¹,

Bouchara²,

Caron³

2012

Nonlinear Analysis: Real World Applications

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Analysis of heart rate control to assess thermal sensitivity responses in Brazilian toads

Natali¹,

Santos²,

Rodrigues³

et al. 2015

Braz J Med Biol Res

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In anurans, changes in ambient temperature influence body temperature and, therefore, energy consumption. These changes ultimately affect energy supply and, consequently, heart rate (HR). Typically, anurans living in different thermal environments have different thermal sensitivities, and these cannot be distinguished by changes in HR. We hypothesized that Rhinella jimi (a toad from a xeric environment that lives in a wide range of temperatures) would have a lower thermal sensitivity regarding cardiac control than R. icterica (originally from a tropical forest environment with a more restricted range of ambient temperatures). Thermal sensitivity was assessed by comparing animals housed at 15° and 25°C. Cardiac control was estimated by heart rate variability (HRV) and heart rate complexity (HRC). Differences in HRV between the two temperatures were not significant (P=0.214 for R. icterica and P=0.328 for R. jimi), whereas HRC differences were. All specimens but one R. jimi had a lower HRC at 15°C (all P<0.01). These results indicate that R. jimi has a lower thermal sensitivity and that cardiac control is not completely dependent on the thermal environment because HRC was not consistently different between temperatures in all R. jimi specimens. This result indicates a lack of evolutive trade-offs among temperatures given that heart rate control at 25°C is potentially not a constraint to heart rate control at 15°C.

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Decreased chaos after exercise in cardiac output time series of rats: a preliminary report

Cited by 3 publications

References 42 publications

Linear and nonlinear measures of blood pressure variability: Increased chaos of blood pressure time series in patients with panic disorder

Linear and nonlinear measures of blood pressure variability: Increased chaos of blood pressure time series in patients with panic disorder

Detecting high-dimensional determinism in time series with application to human movement data

Analysis of heart rate control to assess thermal sensitivity responses in Brazilian toads

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