Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 104 for “"heart rate variability (HRV)"”.
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Heart rate variability (HRV) as a predictor of anemia in premature infants using Artemis
… relationships between blood transfusions and heart rate variability (HRV). Using Artemis, this thesis aimed to identify patterns in HRV to enable non-invasive detection of physiologically significant anemia through data visualization. This work contributes to health informatics by presenting …
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Automatic detection of qt and related intervals
… analysis of different variabilities including heart rate variability (HRV), QT, QTc, RT, QT_{max} and RT_{max}. Using the R wave points as reference points, the Q wave was detected by using the Differential Threshold Method (DTH). The Tmax was detected by using a search window on the derived …
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Effects of a Pregnancy Lifestyle Intervention on Emotion Regulation in Infants Responding to a Toy Removal Task at One-Year of Age
… Infant electroencephalography (EEG; n=13) and heart rate variability (HRV; n=18) were measured at rest and in response to a toy removal task, to determine the ER of infants whose mothers participated in a nutrition and exercise intervention during pregnancy. Results demonstrated positive left …
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Physiological effects of heart rate variability biofeedback during laboratory induced congnitive stress
Heart rate variability (HRV) biofeedback is effective in reducing stress as well as managing chronic disease. It facilitates easy manipulation of HRV, and, therefore, potentially provides a valuable intervention for altering the activity of the autonomic nervous system. The aim of this thesis was …
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Sintomi non motori e disautonomia cardiovascolare in pazienti sardi affetti da malattia di parkinson con e senza mutazioni del gene LRRK2
… mutations. Finally, we performed a study of heart rate variability (HRV) and exercise stress echocardiography with the attempt to investigate dysautonomia in these groups of patients. Methods: Forty fifteen Sardinian PD patients (240 men and 165 women) were included in the study. PD patients …
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Adverse childhood experiences, working memory, and stress
… subjectively via self-report and objectively via heart rate and heart rate variability (HRV). Eighty undergraduate participants completed a series of questionnaires and the n-back task while wearing a heart rate monitor. Accuracy was best in the 1-back blocks; however, ACE group differences in …
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Does the sum of the parts equal the whole: relationships between executive function, visual attention and heart rate variability in ROTC cadets
… and regulating the autonomic nervous system and heart rate variability (HRV) (Thayer & Lane, 2000). Each of these processes has been examined separately, but none have explored the relationships among them. The current study examined visual attention, executive functioning, and HRV in …
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Discriminating noise from chaos in heart rate variability : application to prognosis in heart failure
… (noise-induced) chaos, and applying chaotic heart rate variability (HRV) analysis to the prognosis of mortality in congestive heart failure (CHF). Distinguishing noise from chaos poses a major challenge in nonlinear dynamics theory since the addition of dynamic noise can make a non-chaotic …
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Resting Microvascular and Autonomic Function in Relation to Age and Sex Hormone Concentrations
… function was assessed using 5 mins resting heart rate variability (HRV) and paced deep breathing. Multiple linear regressions were conducted for the influence of estradiol, progesterone, testosterone and age on resting HRV variables and MFI. Aging negatively correlated with respiratory sinus …
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An Exploration of Stress Reactivity and Mindfulness Meditation in Individuals with Migraine Utilizing Heart Rate Variability
… autonomic nervous system imbalance reflected in heart rate variability (HRV). Mindfulness Meditation (MM) is an evidence-based tool for regulating HRV. Previous literature has examined HRV changes in those with headache disorders after cognitive stress induction. These studies have found there …
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Hidden Markov Models for Heart Rate Variability with Biometric Applications
… Markov models: HMM) for modeling individual heart rate variability: HRV) is presented. Starting with a physiologically based statistical model for HRV from the literature, we justify use of HMMs and present methods for parameterizing the model. The forward-backward algorithm and …
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The validation of heart rate variability in individuals with spinal cord injury
… and neglects autonomic damage after injiuy. Heart rate variability (HRV) has the potential to be a valuable measure of cardiac autonomic control after (SCI). Five individuals with tetraplegia and four able-bodied controls underwent 1 min continuous ECG recordings during rest, after Metoprolol …
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The Psychophysiology of Maladaptive Perfectionism and Mindfulness Meditation: An Investigation Using Heart Rate Variability
Heart rate variability (HRV) is a vagal nerve-mediated biomarker of cardiac function used to investigate chronic illness, psychopathology, stress and, more recently, attention-regulation processes such as meditation. This study investigated HRV in relation to maladaptive perfectionism (MP), a …
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QT-interval adaptation to changes in autonomic balance
ECG variability, as it relates to the influence of the autonomic nervous system on the heart, is primarily studied via frequency-domain and time-domain analysis of heart rate variability (HRV). HRV studies the variability of the RR intervals in the ECG; these intervals are modulated by the …
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Heart rate variability in mice with coronary heart disease
Heart rate variability (HRV), the beat-to-beat fluctuation of the heart rate, is a non-invasive test that measures the autonomic regulation of the heart. Assessment of HRV has been shown to predict the risk of mortality in patients after an acute myocardial infarction. Recently, the Krieger lab at …
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Unexplained Exercise Intolerance and Dyspnea in Long COVID
… muscle testing, flow-mediated dilation (FMD), heart-rate variability (HRV), and cardiopulmonary exercise testing (CPET). Participants with long COVID exhibited marked reductions in inspiratory muscle performance—MIP (−52%), SMIP (−71%), and FIT (−79%)—and lower aerobic capacity (VO₂ peak = 21.1 …
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Sleep under stress: the complex web of fear, hypervigilance and mental health in a low socioeconomic status community in South Africa
… of autonomic nervous system function, such as heart rate variability. Heart rate variability (HRV) is a non-invasive measure of autonomic regulation of the heart which can be divided into time and frequency domain variables. Frequency domain variables are derived from the spectral power of the …
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Cognitive Biases and Autonomic Responding in Anxiety and Depression
… and low cardiac vagal control, as reflected in heart rate variability (HRV) indices. Depression has been linked to a memory bias for negative information; however, findings of low HRV for depression are mixed. The high comorbidity of these disorders renders such findings as difficult to …
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The Assessment of Autonomic Function in Young Adults with an Elevated Risk of Metabolic Syndrome
… cardiovagal baroreflex sensitivity (cBRS) and heart rate variability (HRV) were evaluated during ten minutes of supine rest, where heart rate (HR), beat-by-beat blood pressure (BP), and breathing frequency were recorded continuously and analyzed using the sequence method (SBP change >1.0mmHg, …
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Rr Interval Estimation From An Ecg Using A Linear Discrete Kalman Filter
… (ECG) is used to monitor the activity of the heart. The human heart beats seventy times on an average per minute. The rate at which a human heart beats can exhibit a periodic variation. This is known as heart rate variability (HRV). Heart rate variability is an important measurement that can …
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