نتایج جستجو برای: heart rate variability hrv
تعداد نتایج: 1403659 فیلتر نتایج به سال:
We present algorithm for Heart Rate detection based on Short-Term Autocorrelation Center Clipping method. This algorithm is dedicated for biological signal detection, electrocardiogram, in noisy environment with lot of artifacts. Using this algorithm is also possible detect the R pointers in the PQRST complex of the ECG signal. In this paper the new implementation of the heart rate variability ...
BACKGROUND Reactivity of the autonomic nervous system to experimental pain stimuli has been extensively studied using measures of heart rate and blood pressure. Heart rate variability (HRV) attempts to tease out the relative contributions of sympathetic and parasympathetic activity in the autonomic control of the heart and may therefore be more appropriate to investigate autonomic response to s...
HRV (heart rate variability) is a non-invasive maker of cardiac autonomic modulation utilized in many hundreds of scientific studies each year. The reliability of heart rate variability has been frequently investigated yet remains poorly quantified. Assessing the reliability of a measure that assesses dynamic physiological processes and shows large between- and within-subject variation is a com...
Decreased heart rate variability (HRV) is associated with a worse prognosis in a variety of diseases and disorders. We evaluated the determinants of short-period HRV in a random sample of 149 middle-aged men and 137 women from the general population. Spectral analysis was used to compute low-frequency (LF), high-frequency (HF) and total-frequency power. HRV showed a strong inverse association w...
In this study, we investigated the difference between heart rate variability (HRV) derived from electrocardiogramic(ECG) signals and pulse rate variability (PRV) derived from photoplethysmographic(PPG) signals. Fourteen healthy subjects conducted the protocol: 10 min physiological signals including distal pulse wave on finger and ear from photoplethysmography (PPG), and heart beat from electroc...
In this paper, we propose the method of heart rate (HR) and heart rate variability (HRV) spectrogram estimation by analyzing extracted hemoglobin concentration from facial color images. Our method does not require any special camera. In addition, stable presumption is possible even under the ambient light sources. As a result, we could get HR around 99% accuracy and could get HRV spectrogram wi...
BACKGROUND Compared with Caucasians, African Americans have lower heart rate variability (HRV) in the high-frequency domain, but there are no studies in blacks born and living in Africa. METHODS In the Newer versus Older Antihypertensive agents in African Hypertensive patients trial (NCT01030458), patients (30-69 years) with uncomplicated hypertension (140-179/90-109 mmHg) were randomized to ...
The purpose of this study was to establish heart rate variability normative data on obese children and to comparing the accuracy of two medical technologies photoplethesmography (PPG) with electrocardiography (ECG) while measuring heart rate variability (HRV). PPG is a relatively new technique that holds promise for health care practitioners as an evaluative tool and biofeedback instrument due ...
Introduction: Standardised heart rate variability (HRV) analysis is used as a diagnostic and prognostic tool for cardiovascular as well as perioperative risk stratification. The lack of reference values for young and middle-aged subjects however limits implementation of HRV analysis in the clinical setting. With this study we aimed to define reference values, and to define the influences of gen...
CONTEXT Depression is associated with low heart rate variability (HRV) in patients following myocardial infarction, suggesting that alterations in the autonomic nervous system may contribute to the adverse cardiac outcomes associated with depression. Whether depression is associated with low HRV in patients with stable coronary heart disease (CHD) is not known. OBJECTIVE To examine the associ...
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