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"Heart rate variability"

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https://www.readbyqxmd.com/read/28107894/heart-rate-variability-biofeedback-therapy-and-graded-exercise-training-in-management-of-chronic-fatigue-syndrome-an-exploratory-pilot-study
#1
Petra Windthorst, Nazar Mazurak, Marvin Kuske, Arno Hipp, Katrin E Giel, Paul Enck, Andreas Nieß, Stephan Zipfel, Martin Teufel
OBJECTIVE: Chronic fatigue syndrome (CFS) is characterised by persistent fatigue, exhaustion, and several physical complaints. Research has shown cognitive behavioural therapy (CBT) and graded exercise training (GET) to be the most effective treatments. In a first step we aimed to assess the efficacy of heart rate variability biofeedback therapy (HRV-BF) as a treatment method comprising cognitive and behavioural strategies and GET in the pilot trial. In a second step we aimed to compare both interventions with regard to specific parameters...
February 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28107892/generalized-hypervigilance-in-fibromyalgia-normal-interoceptive-accuracy-but-reduced-self-regulatory-capacity
#2
Silke Rost, Dimitri M L Van Ryckeghem, André Schulz, Geert Crombez, Claus Vögele
OBJECTIVE: The factors underlying the aetiology of fibromyalgia (FM) are largely unknown. According to the generalized hypervigilance hypothesis (GHH), FM patients show excessive attention towards pain stimuli and other sensory events, thereby increasing pain perception and dysfunctional behaviour. We tested this notion by assessing interoceptive accuracy (IA) in FM patients and matched healthy controls. We also tested the hypothesis that FM is characterized by reduced self-regulatory capacity as indexed by heart rate variability (HRV)...
February 2017: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/28107380/novel-tools-in-determining-the-physiological-demands-and-nutritional-practices-of-ontario-firerangers-during-fire-deployments
#3
A H Robertson, C Larivière, C R Leduc, Z McGillis, T Eger, A Godwin, M Larivière, S C Dorman
INTRODUCTION: The seasonal profession of wildland fire fighting in Canada requires individuals to work in harsh environmental conditions that are physically demanding. The purpose of this study was to use novel technologies to evaluate the physiological demands and nutritional practices of Canadian FireRangers during fire deployments. METHODS: Participants (n = 21) from a northern Ontario Fire Base volunteered for this study and data collection occurred during the 2014 fire season and included Initial Attack (IA), Project Fire (P), and Fire Base (B) deployments...
2017: PloS One
https://www.readbyqxmd.com/read/28107340/association-of-diabetes-related-complications-with-heart-rate-variability-among-a-diabetic-population-in-the-uae
#4
Ahsan H Khandoker, Haitham M Al-Angari, Kinda Khalaf, Sungmun Lee, Wael Almahmeed, Habiba S Al Safar, Herbert F Jelinek
Microvascular, macrovascular and neurological complications are the key causes of morbidity and mortality among type II diabetes mellitus (T2DM) patients. The aim of this study was to investigate the alterations of cardiac autonomic function of diabetic patients in relation to three types of diabetes-related complications. ECG recordings were collected and analyzed from 169 T2DM patients in supine position who were diagnosed with nephropathy (n = 55), peripheral neuropathy (n = 64) and retinopathy (n = 106) at two hospitals in the UAE...
2017: PloS One
https://www.readbyqxmd.com/read/28104071/cardiac-autonomic-dysfunction-and-incidence-of-atrial-fibrillation-results-from-20-years-follow-up
#5
Sunil K Agarwal, Faye L Norby, Eric A Whitsel, Elsayed Z Soliman, Lin Y Chen, Laura R Loehr, Valentin Fuster, Gerardo Heiss, Josef Coresh, Alvaro Alonso
BACKGROUND: Cardiac autonomic perturbations frequently antecede onset of paroxysmal atrial fibrillation (AF). Interventions that influence autonomic inputs to myocardium may prevent AF. However, whether low heart rate or heart rate variability (HRV), which are noninvasive measures of cardiac autonomic dysfunction, are associated with AF incidence is unclear. OBJECTIVES: This study sought to study the association between HRV and risk of AF. METHODS: This study included 11,715 middle-aged adults in the ARIC (Atherosclerosis Risk In Communities) cohort with heart rate and HRV measures obtained from 2-min electrocardiogram recordings performed at baseline (1987 to 1989)...
January 24, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28103812/can-coefficient-of-variation-of-time-domain-analysis-be-valuable-for-detecting-cardiovascular-autonomic-neuropathy-in-young-patients-with-type-1-diabetes-a-case-control-study
#6
Dovile Razanskaite-Virbickiene, Evalda Danyte, Giedre Mockeviciene, Rimante Dobrovolskiene, Rasa Verkauskiene, Rimantas Zalinkevicius
BACKGROUND: Cardiovascular autonomic neuropathy (CAN) increases morbidity and mortality in diabetes through association with a high risk of cardiac arrhythmias and sudden death, possibly related to silent myocardial ischemia. During the sub-clinical stage, CAN can be detected through reduction in heart rate variability (HRV). The aim of our study was to estimate if the time and frequency-domain analysis can be valuable for detecting CAN in young patients with type 1 diabetes mellitus (T1DM)...
January 19, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28103597/psychophysiological-effects-of-a-single-short-and-moderately-bright-room-light-exposure-on-mildly-depressed-geriatric-inpatients-a-pilot-study
#7
Markus Canazei, Wilfried Pohl, Kathrin Bauernhofer, Ilona Papousek, Helmut K Lackner, Harald R Bliem, Josef Marksteiner, Elisabeth M Weiss
BACKGROUND: Light interventions typically exert their mood-related effects during morning bright light exposures over several weeks. Evidence about immediate ambient room light effects on depressed individuals is still sparse. OBJECTIVE: The present study aimed at examining the acute effects of a single moderately bright room light exposure on mood, and behavioural and cardiac stress reactions of mildly depressed geriatric inpatients during a short cognitive stimulation and while resting...
January 20, 2017: Gerontology
https://www.readbyqxmd.com/read/28102901/risk-of-arrhythmic-death-in-ischemic-heart-disease-a-prospective-controlled-observer-blind-investigation-over-10-years
#8
Thomas Pezawas, André Diedrich, David Robertson, Robert Winker, Bernhard Richter, Li Wang, Herwig Schmidinger
BACKGROUND: Risk of arrhythmic death is considered highest in ischemic heart disease with severe left ventricular ejection fraction (LVEF) reduction. Non-invasive testing should improve decision-making of prophylactic defibrillator (ICD) implantation. METHODS AND RESULTS: We enrolled 120 patients with ischemic heart disease and LVEF <50% and 30 control subjects without ischemic heart disease and normal LVEF. An initial assessment, a second assessment after 3 years, and a final follow-up comprised of: pharmacological baroreflex testing (BRS), short-term spectral (low frequency (LF) to high frequency (HF) ratio) and long-term time domain analysis of heart rate variability (SDNN), exercise Microvolt T-wave alternans (MTWA) and others...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28102898/a-composite-autonomic-index-as-unitary-metric-for-heart-rate-variability-a-proof-of-concept
#9
Roberto Sala, Mara Malacarne, Nadia Solaro, Massimo Pagani, Daniela Lucini
BACKGROUND: This study addresses whether a unitary cardiac autonomic nervous system index (ANSI), obtained combining multiple metrics from Heart Rate Variability (HRV) into a radar plot could provide an easy appreciation of autonomic performance in a clinical setting. MATERIALS AND METHODS: Data are standardized using percentile ranking of autonomic proxies from a relatively large reference population (n= 1593, age 39±13 years). Autonomic indices are obtained from autoregressive spectral analysis of (ECG derived) HRV at rest and during standing up...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28099875/sustained-attention-and-heart-rate-variability-in-children-and-adolescents-with-adhd
#10
Kristi R Griffiths, Daniel S Quintana, Daniel F Hermens, Chris Spooner, Tracey W Tsang, Simon Clarke, Michael R Kohn
The autonomic nervous system (ANS) plays an important role in attention and self-regulation by modulating physiological arousal to meet environmental demands. Core symptoms of ADHD such as inattention and behavioral disinhibition may be related to dysregulation of the ANS, however previous findings have been equivocal. We examined autonomic activity and reactivity by assessing heart rate variability (HRV) in a large sample of un-medicated children and adolescents (6-19 years) with ADHD (n=229) compared to typically-developing controls (n=244) during rest and sustained attention...
January 15, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28099159/reducing-false-arrhythmia-alarm-rates-using-robust-heart-rate-estimation-and-cost-sensitive-support-vector-machines
#11
Qiang Zhang, Xianxiang Chen, Zhen Fang, Qingyuan Zhan, Ting Yang, Shanhong Xia
To lessen the rate of false critical arrhythmia alarms, we used robust heart rate estimation and cost-sensitive support vector machines. The PhysioNet MIMIC II database and the 2015 PhysioNet/CinC Challenge public database were used as the training dataset; the 2015 Challenge hidden dataset was for testing. Each record had an alarm labeled with asystole, extreme bradycardia, extreme tachycardia, ventricular tachycardia or ventricular flutter/fibrillation. Before alarm onsets, 300 s multimodal data was provided, including electrocardiogram, arterial blood pressure and/or photoplethysmogram...
January 18, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28099042/sex-differences-in-associations-between-insulin-resistance-heart-rate-variability-and-arterial-stiffness-in-healthy-women-and-men-a-physiology-study
#12
Luke Anthony Rannelli, Jennifer M MacRae, Michelle C Mann, Sharanya Ramesh, Brenda R Hemmelgarn, Doreen Rabi, Darlene Y Sola, Sofia B Ahmed
Diabetes confers greater cardiovascular risk to women than to men. Whether insulin-resistance-mediated risk extends to the healthy population is unknown. Measures of insulin resistance (fasting insulin, homeostatic model assessment, hemoglobin A1c, quantitative insulin sensitivity check index, glucose) were determined in 48 (56% female) healthy subjects. Heart rate variability (HRV) was calculated by spectral power analysis and arterial stiffness was determined using noninvasive applanation tonometry. Both were measured at baseline and in response to angiotensin II infusion...
November 2, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28095501/birth-weight-and-its-relationship-with-the-cardiac-autonomic-balance-in-healthy-children
#13
Livia Victorino Souza, Vanessa Oliveira, Franciele De Meneck, Ana Paula Grotti Clemente, Maria Wany Louzada Strufaldi, Maria do Carmo Franco
Several studies indicate that the fetal environment plays a significant role in the development of cardiometabolic disease later in life. However, a few studies present conflicting data about the correlation between birth weight and the impairment of cardiac autonomic modulation. The purpose of the present study was to provide further knowledge to elucidate this contradictory relationship. One hundred children aged 5 and 14 years had anthropometric parameters, body composition and blood pressure levels determined...
2017: PloS One
https://www.readbyqxmd.com/read/28093924/effects-of-an-adapted-cardiac-rehabilitation-programme-on-arterial-stiffness-in-patients-with-type-2-diabetes-without-cardiac-disease-diagnosis
#14
Anka P Brozic, Susan Marzolini, Jack M Goodman
PURPOSE: To determine the effects of a 12-week cardiac rehabilitation programme of aerobic and resistance exercise training on arterial stiffness, peak calf vasodilatory reserve, and haemostatic markers in patients with type 2 diabetes. METHODS: Observational cohort study examining effects of 12 weeks of exercise training in 23 subjects (13 men, 10 women; mean age of 56.1 ± 10.1 years) with type 2 diabetes mellitus. Subjects performed exercise training for 12 weeks [aerobic training 5 days/week, 70%-75% peak cardiovascular fitness (VO2peak) and resistance training 2-3 days/week, 60% of one repetition maximum]...
January 1, 2017: Diabetes & Vascular Disease Research
https://www.readbyqxmd.com/read/28093218/-the-effect-of-different-genres-of-music-on-the-stress-levels-of-kennelled-dogs
#15
A Bowman, F J Dowell, N P Evans
Classical music has been shown to reduce stress in kennelled dogs; however, rapid habituation of dogs to this form of auditory enrichment has also been demonstrated. The current study investigated the physiological and behavioural response of kennelled dogs (n=38) to medium-term (5days) auditory enrichment with five different genres of music including Soft Rock, Motown, Pop, Reggae and Classical, to determine whether increasing the variety of auditory stimulation reduces the level of habituation to auditory enrichment...
January 13, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28092512/a-hidden-markov-model-for-seismocardiography
#16
Johan Wahlstrom, Isaac Skog, Peter Handel, Farzad Khosrow-Khavar, Kouhyar Tavakolian, Phyllis K Stein, Arye Nehorai
We propose a hidden Markov model approach for processing seismocardiograms. The seismocardiogram morphology is learned using the expectation-maximization algorithm, and the state of the heart at a given time instant is estimated by the Viterbi algorithm. From the obtained Viterbi sequence, it is then straightforward to estimate instantaneous heart rate, heart rate variability measures, and cardiac time intervals (the latter requiring a small number of manual annotations). As is shown in the conducted experimental study, the presented algorithm outperforms the state-of-the-art in seismocardiogrambased heart rate and heart rate variability estimation Moreover, the isovolumic contraction time and the left ventricular ejection time are estimated with mean absolute errors of about 5 [ms] and 9 [ms], respectively...
January 9, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28091857/lack-of-heart-rate-variability-during-sleep-related-apnea-in-patients-with-temporal-lobe-epilepsy-tle-an-indirect-marker-of-sudep
#17
C S Nayak, S Sinha, M Nagappa, K Thennarasu, A B Taly
PURPOSE: Apneas occurring during sleep may precipitate autonomic instability in epilepsy patients making them susceptible to sudden death (SUDEP). Literature on heart rate variability (HRV) during apnea among patients with temporal lobe epilepsy (TLE) is sparse. The aim of this study was to characterize the HRV during the peri-apneic period in patients with TLE and compare with HRV of matched healthy individuals during the overnight polysomnographic (PSG) recording. Further, the role of carbamazepine (CBZ) in modulating peri-apneic HRV in the above cohort was also assessed...
January 14, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28091409/effect-of-shensong-yangxin-on-the-progression-of-paroxysmal-atrial-fibrillation-is-correlated-with-regulation-of-autonomic-nerve-activity
#18
Hong-Yi Zhao, Shu-Di Zhang, Kai Zhang, Xi Wang, Qing-Yan Zhao, Shu-Juan Zhang, Zi-Xuan Dai, Yong-Sheng Qian, You-Jing Zhang, Hao-Tian Wei, Yan-Hong Tang, Cong-Xin Huang
BACKGROUND: Shensong Yangxin (SSYX), a traditional Chinese herbal medicine, has long been used clinically to treat arrhythmias in China. However, the mechanism of SSYX on atrial fibrillation (AF) is unknown. In this study, we tested the hypothesis that the effect of SSYX on the progression of paroxysmal AF is correlated with the regulation of autonomic nerve activity. METHODS: Eighteen mongrel dogs were randomly divided into control group (n = 6), pacing group (n = 6), and pacing + SSYX group (n = 6)...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28079874/cerebral-modulation-of-the-autonomic-nervous-system-in-term-infants
#19
N Schneebaum Sender, R B Govindan, M T Whitehead, A N Massaro, M Metzler, J Wang, Y I Cheng, A J du Plessis
OBJECTIVE: Central topography of autonomic nervous system (ANS) function has yet to be fully deciphered. In adults it has been shown to lateralize sympathetic and parasympathetic influence predominantly to the right and left cerebral hemispheres, respectively. We examined functional topography of central ANS in newborn subjects utilizing spectral analysis of heart rate variability (HRV), an established measure of ANS function. STUDY DESIGN: We studied newborns with hypoxic-ischemic encephalopathy participating in a prospective study undergoing a therapeutic hypothermia protocol...
January 12, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/28077762/inverse-problems-in-reduced-order-models-of-cardiovascular-haemodynamics-aspects-of-data-assimilation-and-heart-rate-variability
#20
Sanjay Pant, Chiara Corsini, Catriona Baker, Tain-Yen Hsia, Giancarlo Pennati, Irene E Vignon-Clementel
Inverse problems in cardiovascular modelling have become increasingly important to assess each patient individually. These problems entail estimation of patient-specific model parameters from uncertain measurements acquired in the clinic. In recent years, the method of data assimilation, especially the unscented Kalman filter, has gained popularity to address computational efficiency and uncertainty consideration in such problems. This work highlights and presents solutions to several challenges of this method pertinent to models of cardiovascular haemodynamics...
January 2017: Journal of the Royal Society, Interface
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