View clinical trials related to Heart Rate Variability.
Filter by:The aim of this study was to evaluate the impact of caffeine treatment, given either orally or intravenously, on heart rate variability in newborns. In addition, the investigators sought for a potential association between caffeine treatment and vital functions.
Comparison studies comparing hemodynamic parameters provided by the Caretaker against respective Gold Standard references.
The autonomous response of fighter and attack pilots who attend sessions in a flight simulator will be evaluated by measuring and analyzing heart rate variability (HRV).
Cardiovascular disease (CVD) exerts a significant health burden among shift workers, including police, firefighters, and emergency medical services (EMS). The unique occupational demands inherent to these professions--sleep loss, circadian misalignment, high stress, and sustained hyper-vigilance--confer increased risk for both on and off-duty cardiovascular events. Mitigating cardiovascular risks in these professions requires that we first identify robust markers and potential mechanisms of risk. Previous work suggest shift work has a negative impact on blood pressure (BP) and heart rate variability (HRV). Blunted BP dipping at night and during sleep, and reduced HRV are powerful markers of increased CVD risk. Both are linked to preclinical indicators of cardiac damage, such as presence of coronary artery calcium, left atrial enlargement, and cardiovascular-related mortality. This study will use an experimental crossover study design with three intervention conditions to test the impact of a 30 minute brief nap and a 2-hour longer nap versus no nap on BP and HRV. Outcomes of interest include blunted dipping of BP during nighttime hours and during sleep and HRV.
Emergency medicine is a unique specialty focusing on a breadth of acute care, on demand . Shift work is also a fundamental component of emergency medicine, and is associated with chronic stress, including stress at work. Consequently, stress may lead to symptoms of mental exhaustion, physical fatigue, detachment from work, and feelings of diminished competence . Emergency physicians (EPs) are exposed to a complex interplay between stress (life-and-death emergencies - a defining characteristic of their job), sleep deprivation, and fatigue due to repeated changes in, and duration of shifts. Work-related exhaustion can lead to various physical and psychological symptoms, and also may be associated with delayed decision-making . The combined effects of stress and fatigue can impact on job performance, often resulting in otherwise preventable medical errors. Moreover, prolonged stress may expose EPs to a higher risk of multiple diseases, predominantly systemic inflammation and coronary heart disease. All these contribute to the premature departure of EPs to other specialties. Furthermore, low HRV has been associated with stress, burnout, and is linked with an increased risk of cardiovascular diseases. This project proposes to evaluate if life-and-death emergencies or specific situations will induce abrupt changes in HRV among emergency physicians. Moreover, we would like to compare reactions between being an actor (EPs) and being a spectator and assess the role of expertise and habituation to stressful emergency situations.
Patients undergoing hematopoietic stem cell transplantation (HCT) often continue to experience anxiety, depression, isolation, and other psychosocial distress due to the severe nature of the transplant experience. Storytelling interventions that provide an opportunity for emotional disclosure have shown preliminary efficacy to alleviate psychosocial distress and improve emotion regulation during health challenges. Not only are these changes observed in response to such interventions, but they can also be directly strengthened with HRV biofeedback (HRVB) training, a device-driven breath pacing practice that uses colored light signals to provide feedback to increase vagal tone and improve emotional responses and sleep quality by regulating negative affect and stress. This randomized controlled trial will explore the effects of HRV biofeedback (HRVB) training combined with a digital storytelling intervention and changes in psychosocial distress with a modified waitlist control in a population of Hematopoietic cell transplantation (HCT) patients.
The adaptation of the heart to react to any stimulus is called heart rate variability (HRV). Moreover, HRV is now used as a health index. In fact, among the pathologies affecting HRV the most, there are the cardiovascular diseases and depressive disorders that take a predominant part in the investigator's actual societies, According to a recent literature overview, many factors influence HRV and they need to be determined in order to plan efficient research protocols. Moreover, the control of these factors can improve the HRV and therefore help the heart to have maximum capacity to fulfill its physiological functions. Valorizing a good HRV seems, according to the effects reported by several studies, to be a good opportunity to take into consideration and to apply. Visceral osteopathy, even if it goes back to the founder of Osteopathy himself, Andrew Taylor Still, is at its debuts in terms of acknowledgement from a scientific point of view. The evidence of efficacy of osteopathy is not to be done anymore. However, it is now necessary to define the action mechanisms of the osteopathic techniques, particularly by using physiological variables, and starting from a biomechanical angle. In fact, Jean-Pierre Barral and others has developed visceral manipulation techniques based on the viscera anatomy. The originality of this research can be found in the technical protocol, not used yet, the use of witness group, the measurements over four weeks to evaluate the effect of this protocol with time on chosen dependant variables, its reproducibility but also its inter-therapist variance. This objective if this study is to reinforce the proof level of the osteopathic approach on the cardiac physiology. HRV is a solid tool recognized for research, the variable is well isolated and the control group ensures an isolation of some confounding variables.
Determine the effect of feet and calf heating on glucose tolerance relative to thermoneutral control. Heat will be administered using hot water (40 degrees celsius).
This research study will evaluate changes in resting metabolic rate, appetite, and heart rate variability following overnight exposure (8 h/night) to normobaric hypoxia (NH) or normobaric normoxic (NN). In randomized order, participants will sleep one night in NH conditions (~15% oxygen; achieved with nitrogen dilution, equivalent to ~8500 feet elevation) and another night in NN (control) conditions (~20% oxygen; achieved with nitrogen dilution, equivalent to ~1000 feet elevation).
The main goal of this project is to investigate how low intensity cycling exercise (1.5W/kg, for 6 minutes) influences cerebral functions, such as: Cerebral blood flow, oxygenation, and other physiological variables in different normobaric and hypobaric hypoxic conditions.