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Low frequency hrv

David A Giles, Nick Draper
Giles, DA and Draper, N. Heart rate variability during exercise: a comparison of artefact correction methods. J Strength Cond Res 32(3): 726-735, 2018-There is a need for standard practice in the collection and processing of RR interval data recorded using heart rate monitors (HRMs) in research. This article assessed the validity of RR intervals and heart rate variability (HRV) data obtained using an HRM during incremental exercise and artefact correction methods. Eighteen participants completed an active orthostatic test and incremental running V[Combining Dot Above]O2max test, while simultaneous recordings using a Polar V800 HRM and an electrocardiogram were made...
March 2018: Journal of Strength and Conditioning Research
Akinori Sairaku, Yukiko Nakano, Nobuo Shiode, Kazuyoshi Suenari, Nozomu Oda, Koichi Ono, Yasuki Kihara
AIM: The bisoprolol transdermal patch is a newly developed β-blocker designed to deliver its pharmaceutical ingredient through the skin surface. We aimed to compare the bisoprolol transdermal patch and bisoprolol fumarate tablet using the heart rate variability (HRV). METHOD: Eligible hypertensive patients received a 2-week administration with a 2.5 mg bisoprolol fumarate tablet, followed by 24-hour Holter monitoring. The tablet was then switched to a 4 mg bisoprolol transdermal patch, and after 2-weeks of its administration, the Holter monitoring was repeated...
February 21, 2018: Cardiovascular Therapeutics
Tugba Hirfanoglu, Ayse Serdaroglu, Ilker Cetin, Gokhan Kurt, Irem Y Capraz, Filiz Ekici, Ebru Arhan, Erhan Bilir
PURPOSE: The aim of this study was to evaluate the effects of vagus nerve stimulation (VNS) on heart rate variability (HRV) in children with epilepsy. METHODS: The subgroups of HRV, namely time domain (Standard deviation of NN interval (SDNN), SDNN index, Standard deviation of the averages of NN intervals (SDANN), Root mean square of successive differences (RMMSD), Adjacent NN intervals differing by more than 50 ms in the entire recording divided by the total number of all NN intervals (PNN50), triangular index) and frequency domain (Low-frequency (LF), High-frequency (HF), LF/HF), were investigated in 20 pediatric patients before and after 6 and 12months of VNS treatment during day and night by comparing their data with those of 20 control subjects...
February 17, 2018: Epilepsy & Behavior: E&B
Hilal Yesil, Sibel Eyigor, Meral Kayıkcıoglu, Ruchan Uslu, Menekse Inbat, Benay Ozbay
Objective Heart rate variability (HRV) is a good indicator of the autonomic nervous system (ANS) activity. A few studies have been conducted recently and have shown a relationship between reduced HRV and conditions that lead to neuropathic pain (NP). In this study, we aimed to investigate whether NP is associated with changes in cardiac sympathovagal activity in patients with breast cancer (BC). Methods We used the Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) questionnaire to evaluate NP in 70 patients with BC...
February 15, 2018: Neurological Research
Antonia Kotianova, Michal Kotian, Milos Slepecky, Michaela Chupacova, Jan Prasko, Ingrid Tonhajzerova
Background: Alarming somatic symptoms, in particular, cardiovascular symptoms, are the characteristic feature of panic attacks. Increased cardiac mortality and morbidity have been found in these patients. Power spectral analysis of electrocardiogram R-R intervals is known to be a particularly successful tool in the detection of autonomic instabilities in various clinical disorders. Our study aimed to compare patients with panic disorder and healthy controls in heart rate variation (HRV) parameters (very-low-frequency [VLF], low-frequency [LF], and high-frequency [HF] band components of R-R interval) in baseline and during the response to the mental task...
2018: Neuropsychiatric Disease and Treatment
Rasha El-Kotob, B Catharine Craven, Sunita Mathur, David S Ditor, Paul Oh, Masae Miyatani, Mary C Verrier
Background: Although cardiac autonomic dysfunction is a contributing factor for cardiovascular disease development in individuals with a spinal cord injury (SCI), it remains poorly understood. Heart rate variability (HRV) analysis has the potential to non-invasively assess the cardiac autonomic nervous system. The study objectives are (a) to determine if there are differences in HRV measures across neurological level of impairment (NLI) and American Spinal Cord Injury Association Impairment Scale (AIS) subgroups, and (b) to determine if there is a relationship between HRV frequency measures (low frequency [LF] and high frequency [HF]) at rest...
2018: Topics in Spinal Cord Injury Rehabilitation
Stanisław Zajączkowski, Wiesław Ziółkowski, Piotr Badtke, Miłosz A Zajączkowski, Damian J Flis, Adam Figarski, Maria Smolińska-Bylańska, Tomasz H Wierzba
BACKGROUND: It has long been suggested that reactive oxygen species (ROS) play a role in oxygen sensing via peripheral chemoreceptors, which would imply their involvement in chemoreflex activation and autonomic regulation of heart rate. We hypothesize that antioxidant affect neurogenic cardiovascular regulation through activation of chemoreflex which results in increased control of sympathetic mechanism regulating heart rhythm. Activity of xanthine oxidase (XO), which is among the major endogenous sources of ROS in the rat has been shown to increase during hypoxia promote oxidative stress...
2018: PloS One
Ícaro J S Ribeiro, Rafael Pereira, Paulo F Valença Neto, Ivna V Freire, Cezar A Casotti, Mitermayer Galvão Dos Reis
BACKGROUND AND OBJECTIVE: Diabetes mellitus is one of the most common non-communicable diseases (NCDs) and may influence the autonomic nervous system. This study aims to analyze the autonomic control, through heart rate variability (HRV), from community-dwelling elders with (DM+) and without diabetes mellitus (DM-). MATERIALS AND METHODS: This cross-sectional study, in which 205 elders (≥ 60 years old), from the urban area of Aiquara municipality gave their written consent to participate...
February 3, 2018: Medicina
Madhuradhar Chegondi, Jun Sasaki, Sayed Naqvi, Wei-Chiang Lin, Andre Raszynski, Balagangadhar R Totapally
Heart rate variability (HRV) has been used as prognostic tool in various disorders in pediatric and adult patients. In our study we aimed to evaluate heart rate variability indices and their association with neurological outcome in three children with anoxic brain injury following drowning. Three children included in the study were admitted following drowning and required mechanical ventilation and targeted temperature management. All physiologic data, including electrocardiography (ECG) and EEG were collected for a period of 3-5 days after enrollment...
January 2018: Indian Journal of Critical Care Medicine
Wei Hung Chang, I Hui Lee, Mei Hung Chi, Shih-Hsien Lin, Kao Chin Chen, Po See Chen, Nan Tsing Chiu, Wei Jen Yao, Yen Kuang Yang
Top-down regulation in the human brain and anatomical connections between the prefrontal cortex (PFC) and specific catecholamine-related regions have been well-studied. However, the way in which the PFC modulates downstream neuro-networks in terms of serotonin and the autonomic nervous system (ANS) by variation in the level of brain-derived neurotrophic factor (BDNF) is still unclear. We recruited sixty-seven healthy subjects. Serotonin transporter (SERT) availability was examined by SPECT with [ 123 I]ADAM analysis; heart rate variability (HRV) testing was performed, and the BDNF level was measured...
February 7, 2018: Scientific Reports
So Young Joo, A Ram Hong, Boung Chul Lee, Jae Hyuk Choi, Cheong Hoon Seo
BACKGROUND: Heart rate variability (HRV) is a noninvasive method used to quantify fluctuations in the time interval between normal heart beats. The purpose of this study was to compare the autonomic nervous system functioning of patients with burns to healthy participants after their burn scars had been re-epithelialized. MATERIALS AND METHODS: The authors prospectively performed 24-h HRV monitoring in 60 patients with electrical burns, those with other major burns, those with other minor burns, and 10 healthy participants...
February 3, 2018: Burns: Journal of the International Society for Burn Injuries
F Bellavere, V Cacciatori, E Bacchi, M L Gemma, D Raimondo, C Negri, K Thomaseth, M Muggeo, E Bonora, P Moghetti
BACKGROUND AND AIMS: Both aerobic (AER) and resistance (RES) training improve metabolic control in patients with type 2 diabetes (T2DM). However, information on the effects of these training modalities on cardiovascular autonomic control is limited. Our aim was to compare the effects of AER and RES training on cardiovascular autonomic function in these subjects. METHODS AND RESULTS: Cardiovascular autonomic control was assessed by Power Spectral Analysis (PSA) of Heart Rate Variability (HRV) and baroreceptors function indexes in 30 subjects with T2DM, randomly assigned to aerobic or resistance training for 4 months...
January 2, 2018: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
Monika Zawadka-Kunikowskaa, Krzysztof Słomiński, Joanna Słomko, Małgorzata Tafil-Klawe, Jacek J Klawe, Łukasz Sokołowski, Julia L Newton, Paweł Zalewski
PURPOSE: The aim of this study was to comprehensively determine haemodynamic and autonomic responses during-head up tilt test (HUT) in the acute and recovery phase of ischemic stroke. METHODS: Cardiovascular parameters, baroreflex sensitivity (BRS), spectral- indices of heart rate (HRV), systolic (sBPV) and diastolic blood pressure variability (dBPV) were measured at rest in ischaemic stroke patients (n=17) and control group (n=34). Dynamic cardiac autonomic function was assessed using HUT (Delta [rest-tilt]...
February 1, 2018: Minerva Cardioangiologica
Dina Tell, Herbert L Mathews, Robert L Burr, Linda Witek Janusek
Childhood adversity has long-lasting neuro-biological effects that can manifest as exaggerated stress responsivity to environmental challenge. These manifestations include a dysregulated hypothalamic-pituitary-adrenocortical (HPA) axis as well as increased levels of inflammatory mediators in response to stress. In this investigation, vagal parasympathetic activity was assessed for its capacity to moderate the relationship between childhood adversity and stress responsivity (cortisol and inflammation) during an acute laboratory challenge (Trier Social Stress Test-TSST)...
February 1, 2018: Stress: the International Journal on the Biology of Stress
Yoon H Cho, Maria E Craig, Tracey Jopling, Albert Chan, Kim C Donaghue
BACKGROUND: Obesity is associated with an increased risk of cardiovascular morbidity in adults with diabetes. OBJECTIVE: To examine the predictive role of body mass index (BMI) and adiposity on cardiac autonomic function in childhood onset type 1 diabetes. SUBJECTS: Two hundred and fifty-three participants with type 1 diabetes (aged 8-30 years) were assessed for diabetes complications at a tertiary hospital, and followed over 7 years (total 922 visits)...
January 31, 2018: Pediatric Diabetes
Ross W May, Gregory S Seibert, Marcos A Sanchez-Gonzalez, Frank D Fincham
Emerging research documents the relationship between school burnout and some indicators of increased cardiovascular risk. Indicators of cardiovascular functioning assessed via ambulatory blood pressure and heart rate variability (HRV) have not been thoroughly explored in this research domain. Therefore, the current study examined relationships between school burnout and indicators of cardiac functioning via 24 h ambulatory blood pressure (BP) and electrocardiogram monitoring in a sample of young adult female undergraduates (N = 88)...
January 30, 2018: Stress: the International Journal on the Biology of Stress
Li He, Lan Wang, Lun Li, Xiaoyan Liu, Yijun Yu, Xiaoyun Zeng, Huanhuan Li, Ye Gu
Non-pharmacological therapies, especially the physical maneuvers, are viewed as important and promising strategies for reducing syncope recurrences in vasovagal syncope (VVS) patients. We observed the efficacy of a modified Valsalva maneuver (MVM) in VVS patients. 72 VVS patients with syncope history and positive head-up tilt table testing (HUTT) results were randomly divided into conventional treatment group (NVM group, n = 36) and conventional treatment plus standard MVM for 30 days group (MVM group, n = 36)...
2018: PloS One
Vittorio Cacciatori, Giacomo Zoppini, Federico Bellavere, Riccardo Rigolon, Karl Thomaseth, Isabella Pichiri, Maddalena Trombetta, Marco Dauriz, Francesca De Santi, Giovanni Targher, Lorenza Santi, Enzo Bonora
Long-acting glucagon-like peptide 1 receptor agonists are increasingly used to treat type 2 diabetes. An increase of heart rate (HR) has been observed with their use. To elucidate the role of the cardiac sympatho-vagal balance as a possible mediator of the reported increase in HR, we performed power spectral analysis of HR variability (HRV) in patients receiving exenatide extended-release (ER). Twenty-eight ambulatory patients with type 2 diabetes underwent evaluation at initiation of exenatide-ER and thereafter at 3 and at 6 months...
January 1, 2018: Journal of the Endocrine Society
Chorong Song, Harumi Ikei, Yoshifumi Miyazaki
This study was aimed to clarify the physiological effects of visual stimulation using forest imagery on activity of the brain and autonomic nervous system. Seventeen female university students (mean age, 21.1 ± 1.0 years) participated in the study. As an indicator of brain activity, oxyhemoglobin (oxy-Hb) concentrations were measured in the left and right prefrontal cortex using near-infrared time-resolved spectroscopy. Heart rate variability (HRV) was used as an indicator of autonomic nervous activity. The high-frequency (HF) component of HRV, which reflected parasympathetic nervous activity, and the ratio of low-frequency (LF) and high-frequency components (LF/HF), which reflected sympathetic nervous activity, were measured...
January 26, 2018: International Journal of Environmental Research and Public Health
J-H Huang, H-A Chang, W-H Fang, P-S Ho, Y-P Liu, F-J Wan, N-S Tzeng, J-F Shyu, C-C Chang
OBJECTIVE: The G-allele of the -1019C/G (rs6295) promoter polymorphism of the serotonin receptor 1A (HTR1A) gene has been implicated in anxiety; however, the underlying neurophysiological processes are still not fully understood. Recent evidence indicates that low parasympathetic (vagal) tone is predictive of anxiety. We thus conducted a structural equation model (SEM) to examine whether the HTR1A rs6295 variant can affect anxiety by altering parasympathetic nervous activity. METHOD: A sample of 1141 drug-free healthy Han Chinese was recruited for HTR1A genotyping...
January 24, 2018: Acta Psychiatrica Scandinavica
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