The Coefficient of Variation of RR Intervals (CVRR) on Electrocardiogram in Patients with Essential Hypertension with Reference to Aging, Hemodynamics and Sympatho-Adrenomedullary Function.

Shimazaki, M; Kikuchi, Kenjiro; Kobayakawa, Hiroshi; Yamamoto, Motohisa; Kudoh, Chika; Wada, Atsushi; Sakamoto, Takashi; Sawai, Niroh; Mukai, Hiroya; Ito, Osamu

doi:10.3143/geriatrics.28.640

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…12 Mean heart rate (HR), mean R-R interval, standard deviation of RR interval (SDRR), the coefficient of variation of the RR interval (CVRR), the standard deviation of the differences of successive RR intervals (SDSD), square root of mean squared differences of successive RR intervals (RMSSD) and the proportion derived by dividing number of RR interval > 50 ms by the total number of RR interval (pRR50%) are considered as time domain measures for HRV measurement in which mean HR, SDRR are the net interaction of both sympathetic and parasympathetic nerve function activity and mean R-R interval, CVRR, RMSSD, SDSD and pRR50% reflect cardiac parasympathetic modulation. [13][14][15][16][17][18] Type 2 diabetic patients has been found associated with decrement of cardiac parasympathetic activity. 12,[13][14][15][19][20] There are reports of improvement of autonomic nervous activities as a result of regular practice of relaxation technique in healthy subjects.…”

Section: Can Maymentioning

confidence: 99%

Effect of Deep Relaxation Technique on Cardiac Autonomic Dysfunction in Type 2 Diabetes Mellitus

Rahman¹,

Ferdousi

2018

J Bangladesh Soc Physiol

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Background: Type 2 Diabetes Mellitus (T2DM) may be associated with autonomic dysfunction. Performance of deep relaxation technique (DRT) may cause upturn of this deranged nerve function.Objective: To evaluate the impact of DRT on cardiac autonomic nerve function by analysis of time domain series of Heart Rate Variability (HRV) in T2DM patients.Methods: This prospective study was carried out on 30 female T2DM patients aged 50-55 years with duration of diabetes of 5-10 years enrolled from the Out Patient Department of Endocrinology, Bangabandhu Sheikh Mujib Medical University, Dhaka. They performed DRT (20 minutes twice daily) for 3 months. Thirty apparently healthy female with similar age who did not perform DRT or any other form of exercise, were included as control. To assess the cardiac autonomic nerve function, time domain measures of HRV of all subjects were recorded by a data acquisition device Power Lab (Australia). HRV data of all subjects were collected at baseline (pre) and also after 3 months(Post). For statistical analysis, paired and independent sample t-test were used.Results: The pre-intervention values of resting HR was significantly higher (p<0.001) and mean R-R interval, SDRR, CVRR, SDSD, RMSSD and pRR50% were significantly lower (p<0.001) in all diabetic patients compared to control. After 3 months of DRT, there was significant decrement in resting mean heart rate (p<0.01) and significant increment in mean R-R interval, SDRR, CVRR, SDSD, RMSSD and pRR50% (p<0.001) compared to their pre-intervention values.Conclusion: Cardiac autonomic nerve dysfunction may occur in T2DM and 3 months regular practice of DRT mayy significantly improv cardiac autonomic nerve function with parasympathetic dominance.J Bangladesh Soc Physiol. 2018, June; 13(1): 22-28

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Section: Can Maymentioning

confidence: 99%

Effect of Deep Relaxation Technique on Cardiac Autonomic Dysfunction in Type 2 Diabetes Mellitus

Rahman¹,

Ferdousi

2018

J Bangladesh Soc Physiol

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“…To evaluate barore ex function based on autonomic nervous activity, methods related to heart rate variability, such as coefcient of variation of RR intervals (CVRR), RR at 50% of QTmax (RR50), and low frequency/high frequency ratio (LF/HF), have been used [3][4][5][6]. However, these indices have problems with time resolution and reproducibility.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Baroreflex Function Using Green Light Photoplethysmogram in Consideration of Resistance to Artifacts

Abe

Yoshizawa

Obara

et al. 2015

ABE

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The maximum cross-correlation coef cient (ρ max ) between blood pressure (BP) and heart rate (HR) variability for frequency components limited to the Mayer wave-related band is useful for the evaluation of barore ex function. However, continuous BP measurement with an expensive and bulky measuring device is required to calculate ρ max . This study proposes a simpler method to obtain ρ max using a green light photoplethysmogram (PPG). A green PPG sensor is less affected by motion artifacts than a near-infrared PPG sensor. In this study, an electrocardiogram, continuous BP, green PPG, and near-infrared PPG were obtained from the subjects. HR, mean BP, and pulse transit time were estimated from the signals, and ρ max was subsequently calculated. Compared to the ρ max obtained from the near-infrared PPG signal, the ρ max obtained from the green PPG signal is closer in value to the ρ max obtained from mean BP. These results show that the green PPG sensor can be used to estimate barore ex function instead of using continuous BP measurement.

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Discrimination ability and reproducibility of a new index reflecting autonomic nervous function based on pulsatile amplitude of photoplethysmography

Kano

Yoshizawa

Sugita

et al. 2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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A new physiological index (μ(PA)) is proposed to represent the autonomic nervous system (ANS) function. The index μ(PA) is defined as the natural logarithm of the ratio between two different frequency components of the pulsatile amplitude of the photoplethysmogram (PPG) signal. The discrimination ability and the reproducibility of μ(PA) have been compared with other traditional ANS indices. In the experiment, the electrocardiogram, the PPG and continuous blood pressure were measured in 59 healthy young subjects (age 25.7 ± 6.3) and 86 healthy elderly subjects (age 70.2 ± 4.1) at rest. The discrimination ability and the reproducibility were evaluated by Cohen's d between young and elderly groups and by the interclass correlation coefficient, respectively. The results showed that the elderly subjects were significantly (p<;0.001) lower than young subjects in μ(PA) and a few traditional indices introduced to be compared with μ(PA). Therefore, it suggests that μ(PA) is associated with the decrease in the ANS function accompanied by aging. Moreover, it showed that the discrimination ability and the reproducibility of the proposed index are comparable or larger than those of traditional indices. The proposed index based on the PPG signal will be applied to tele-healthcare systems for monitoring people's health in daily life in combination with the ratio of the standard deviation of the R-R intervals to their average value (CVRR).

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The Coefficient of Variation of RR Intervals (CVRR) on Electrocardiogram in Patients with Essential Hypertension with Reference to Aging, Hemodynamics and Sympatho-Adrenomedullary Function.

Cited by 3 publications

References 7 publications

Effect of Deep Relaxation Technique on Cardiac Autonomic Dysfunction in Type 2 Diabetes Mellitus

Effect of Deep Relaxation Technique on Cardiac Autonomic Dysfunction in Type 2 Diabetes Mellitus

Evaluation of Baroreflex Function Using Green Light Photoplethysmogram in Consideration of Resistance to Artifacts

Discrimination ability and reproducibility of a new index reflecting autonomic nervous function based on pulsatile amplitude of photoplethysmography

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