نتایج جستجو برای: تغییرپذیری ضربان قلب heart rate variability hrv
تعداد نتایج: 1415233 فیلتر نتایج به سال:
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...
Reduced cardiac vagal control reflected in low heart rate variability (HRV) is associated with greater risks for cardiac morbidity and mortality. In two-stage meta-analyses of genome-wide association studies for three HRV traits in up to 53,174 individuals of European ancestry, we detect 17 genome-wide significant SNPs in eight loci. HRV SNPs tag non-synonymous SNPs (in NDUFA11 and KIAA1755), e...
اثر داروی آنتی کولینرژیک دی سیکلومین هیدروکلراید بر نوسان ضربان قلب و آزمون چمباتمه در داوطلبین سالم
Background and purpose:Squatting test and heart rate variability (HRV) are currently being used to evaluate cardiovascular autonomic nervous function. HRV indexes are able to measure vagal function, while squatting test is able to measure both sympathetic and vagal functions. Our objective in this research is to evaluate the influence of injective dicyclomine hydrochloride (DCH)-an M1 recepto...
Background: It is well documented that stress poses a serious challenge to students’ health in medical school. The Perceived Stress Scale (PSS) the most widely used psychological instrument for measuring perception of stress. Heart rate variability (HRV) may provide an objective measure physiologic index students. This study investigated impact one semester school on HRV and PSS first-year
BACKGROUND We determined the extent to which heart rate variability (HRV) responses to daily physical activity differ between subjects with and without chronic neck pain. METHOD Twenty-nine subjects (13 women) with chronic neck pain and 27 age- and gender-matched healthy controls participated. Physical activity (accelerometry), HRV (heart rate monitor), and spatial location (Global Positionin...
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