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"Heart rate variability"

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https://www.readbyqxmd.com/read/29352290/correction-association-of-physical-capacity-with-heart-rate-variability-based-on-a-short-duration-measurement-of-resting-pulse-rate-in-older-adults-with-obesity
#1
Chun-De Liao, Jau-Yih Tsauo, Dun-Jen Hsiao, Tsan-Hon Liou, Shih-Wei Huang, Li-Fong Lin
[This corrects the article DOI: 10.1371/journal.pone.0189150.].
2018: PloS One
https://www.readbyqxmd.com/read/29352184/expression-and-relevance-of-the-g-protein-gated-k-channel-in-the-mouse-ventricle
#2
Allison Anderson, Kanchan Kulkarni, Ezequiel Marron Fernandez de Velasco, Nicholas Carlblom, Zhilian Xia, Atsushi Nakano, Kirill A Martemyanov, Elena G Tolkacheva, Kevin Wickman
The atrial G protein-gated inwardly rectifying K+ (GIRK) channel is a critical mediator of parasympathetic influence on cardiac physiology. Here, we probed the details and relevance of the GIRK channel in mouse ventricle. mRNAs for the atrial GIRK channel subunits (GIRK1, GIRK4), M2 muscarinic receptor (M2R), and RGS6, a negative regulator of atrial GIRK-dependent signaling, were detected in mouse ventricle at relatively low levels. The cholinergic agonist carbachol (CCh) activated small GIRK currents in adult wild-type ventricular myocytes that exhibited relatively slow kinetics and low CCh sensitivity; these currents were absent in ventricular myocytes from Girk1-/- or Girk4-/- mice...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29350622/beyond-hrv-attractor-reconstruction-using-the-entire-cardiovascular-waveform-data-for-novel-feature-extraction
#3
Philip J Aston, Mark I Christie, Ying H Huang, Manasi Nandi
Advances in monitoring technology allow blood pressure waveforms to be collected at sampling frequencies of 250-1000Hz for long time periods. However, much of the raw data are under analysed. Heart rate variability (HRV) methods, in which beat-to-beat interval lengths are extracted and analysed, have been extensively studied, However, this approach discards the majority of the raw data. OBJECTIVE: Our aim is to detect changes in the shape of the waveform in long streams of blood pressure data...
January 19, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29350296/use-of-biotechnological-devices-in-the-quantification-of-psychophysiological-workload-of-professional-chess-players
#4
Juan P Fuentes, Santos Villafaina, Daniel Collado-Mateo, Ricardo de la Vega, Narcis Gusi, Vicente Javier Clemente-Suárez
Psychophysiological requirements of chess players are poorly understood, and periodization of training is often made without any empirical basis. For this reason, the aim of the present study was to investigate the psychophysiological response and quantify the player internal load during, and after playing a chess game. The participant was an elite 33 year-old male chess player ranked among the 300 best chess players in the world. Thus, cortical arousal by critical flicker fusion threshold, electroencephalogram by the theta Fz/alpha Pz ratio and autonomic modulation by heart rate variability were analyzed...
January 19, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29350194/detection-rate-of-fetal-distress-using-contraction-dependent-fetal-heart-rate-variability-analysis
#5
Guy J J Warmerdam, Rik Vullings, Judith O E H Van Laar, M Beatrijs Van der Hout-Van der Jagt, Jan W M Bergmans, Lars Schmitt, S Guid Oei
Monitoring of the fetal condition during labor is currently performed by cardiotocography (CTG). Despite the use of CTG in clinical practice, CTG interpretation suffers from a high inter- and intra-observer variability and a low specificity. In addition to CTG, analysis of fetal heart rate variability (HRV) has been shown to provide information on fetal distress. However, fetal HRV can be strongly influenced by uterine contractions, particularly during the second stage of labor. Therefore, the aim of this study is to examine if distinguishing contractions from rest periods can improve the detection rate of HRV features for fetal distress during the second stage of labor...
January 19, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29350018/allergy-and-high-trait-anxiety-are-related-to-increases-in-heart-rate-variability-results-of-naturalistic-long-term-design-study
#6
J Rajcani, P Solarikova, I Brezina
A number of studies report heart rate variability (HRV) changes in allergic as well as high trait anxious people, and associations between allergic inflammation and trait anxiety. This study investigated HRV of 20 low anxious allergic, 19 healthy high trait anxious and 18 healthy low anxious, in naturalistic setting. On arranged research days, subjects performed measurements using portable ECG device and subjective self-assessment of perceived stress. Five repeated measurements data from each subject have shown increases in overall HRV, as well as HRV on respiratory frequencies in both allergy and high trait anxiety...
January 2018: European Annals of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29348110/the-role-of-ethnicity-and-environment-in-the-regulation-of-response-to-sensory-stimulus-in-children-protocol-and-pilot-findings-of-a-neurophysiological-study
#7
Ivan Neil Gomez, Cynthia Yy Lai, Chetwyn Ch Chan, Hector Wh Tsang
BACKGROUND: The ability to regulate the response to sensory stimuli has been associated with successful behavioral patterns necessary for daily activities. However, it is not known whether a child's ethnicity and environment can influence autonomic regulatory mechanisms. OBJECTIVE: This study aims to explore the role of ethnicity and environment in the regulation of responses to sensory stimuli in children. METHODS: In this study, we intend to recruit 128 children from different ethnic groups or environment contexts as follows: (1) 32 typically developing Chinese children living in Hong Kong; (2) 32 typically developing Filipino children living in Hong Kong; (3) 32 typically developing Filipino children who are living in urban areas; and (4) 32 typically developing Filipino children who are living in rural areas in Philippines...
January 18, 2018: JMIR Research Protocols
https://www.readbyqxmd.com/read/29345542/effects-of-late-night-training-on-slow-wave-sleep-episode-and-hour-by-hour-derived-nocturnal-cardiac-autonomic-activity-in-female-soccer-players
#8
Júlio A Costa, João Brito, Fábio Y Nakamura, Eduardo M Oliveira, António N Rebelo
PURPOSE: To assess the sensitivity of nocturnal heart rate variability (HRV) monitoring methods to the effects of late-night soccer training sessions in female athletes. METHODS: Eleven female soccer players competing in the 1st division of the Portuguese soccer league wore HR monitors during night-sleep throughout a one-week competitive in-season microcycle, after late-night training sessions (n = 3) and rest days (n = 3). HRV was analyzed through "slow-wave sleep episode" (SWSE; 10 min duration) and "hour-by-hour" (all the RR intervals recorded throughout the hours of sleep)...
January 18, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29343929/yoga-offers-cardiovascular-protection-in-early-postmenopausal-women
#9
Sinha M Praveena, Gandhi Asha, Mondal Sunita, Jain Anju, Biswas Ratna
Context: Postmenopause, an estrogen deficient state comes with increased incidence of cardiovascular diseases (CVDs). Yoga has been described as having a beneficial effect on heart rate variability (HRV), a marker for cardiac autonomic activity which can assess cardiovascular risk, in various populations. Aim: the aim of the study was to study the effect of 3-month long Yoga practice on HRV in early postmenopausal women. Settings and Design: A prospective longitudinal study of 67 women within 5 years of menopause between 45 and 60 years of age attending menopause clinic of Department of Gynaecology, Sucheta Kriplani Hospital fulfilling inclusion and exclusion criteria and consenting were enrolled for the study...
January 2018: International Journal of Yoga
https://www.readbyqxmd.com/read/29343839/musical-auditory-stimulus-acutely-influences-heart-rate-dynamic-responses-to-medication-in-subjects-with-well-controlled-hypertension
#10
Eli Carlos Martiniano, Milana Drumond Ramos Santana, Érico Luiz Damasceno Barros, Maria do Socorro da Silva, David Matthew Garner, Luiz Carlos de Abreu, Vitor E Valenti
Music can improve the efficiency of medical treatment when correctly associated with drug action, reducing risk factors involving deteriorating cardiac function. We evaluated the effect of musical auditory stimulus associated with anti-hypertensive medication on heart rate (HR) autonomic control in hypertensive subjects. We evaluated 37 well-controlled hypertensive patients designated for anti-hypertensive medication. Heart rate variability (HRV) was calculated from the HR monitor recordings of two different, randomly sorted protocols (control and music) on two separate days...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29342011/utility-of-time-and-frequency-domain-parameters-of-heart-rate-variability-in-the-context-of-autonomic-disorders-characterized-by-orthostatic-dysfunction
#11
Jacquie Baker, Juan M Racosta, Brittany Balint, Kurt Kimpinski
PURPOSE: The clinical significance of heart rate variability in the context of autonomic dysfunction continues to be a matter of debate. A consensus is lacking on the best heart rate variability measures for clinical purposes. Therefore, the purpose of this study was to investigate the utility of heart rate variability parameters in healthy versus autonomic dysfunction. METHODS: Healthy young (n = 134), healthy older (n = 32), and patients with mild (postural tachycardia syndrome; n = 25) and severe (neurogenic orthostatic hypotension; n = 34) autonomic dysfunction were included...
January 16, 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29340538/autonomic-nervous-system-monitoring-in-intensive-care-as-a-prognostic-tool-systematic-review
#12
Luis Bento, Rui Fonseca-Pinto, Pedro Póvoa
OBJECTIVE: To present a systematic review of the use of autonomic nervous system monitoring as a prognostic tool in intensive care units by assessing heart rate variability. METHODS: Literature review of studies published until July 2016 listed in PubMed/Medline and conducted in intensive care units, on autonomic nervous system monitoring, via analysis of heart rate variability as a prognostic tool (mortality study). The following English terms were entered in the search field: ("autonomic nervous system" OR "heart rate variability") AND ("intensive care" OR "critical care" OR "emergency care" OR "ICU") AND ("prognosis" OR "prognoses" OR "mortality")...
October 2017: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/29338917/exercise-training-in-adults-with-repaired-tetralogy-of-fallot-a-randomized-controlled-pilot-study-of-continuous-versus-interval-training
#13
Marko Novaković, Katja Prokšelj, Uroš Rajkovič, Tjaša Vižintin Cuderman, Katja Janša Trontelj, Zlatko Fras, Borut Jug
INTRODUCTION: Adults with repaired tetralogy of Fallot (ToF) have impaired exercise capacity, vascular and cardiac autonomic function, and quality of life (QoL). Specific effects of high-intensity interval or moderate continuous exercise training on these parameters in adults with repaired ToF remain unknown. METHODS AND RESULTS: Thirty adults with repaired ToF were randomized to either high-intensity interval, moderate intensity continuous training (36 sessions, 2-3 times a week) or usual care (no supervised exercise)...
January 3, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29338020/autonomic-stress-reactivity-and-craving-in-individuals-with-problematic-internet-use
#14
Tania Moretta, Giulia Buodo
The link between autonomic stress reactivity and subjective urge/craving has been less systematically examined in behavioral addictions (i.e. problematic Internet use) than in substance use disorders. The present study investigated whether problematic Internet users (PU) show enhanced autonomic stress reactivity than non-PU, indexed by lower Heart Rate Variability (HRV) and higher Skin Conductance Level (SCL) reactivity during the Trier Social Stress Test (TSST), whether greater reactivity is related to stronger Internet craving, and whether problematic Internet usage is associated with some dysfunctional psychological features...
2018: PloS One
https://www.readbyqxmd.com/read/29337261/heart-rate-variability-alters-cardiac-repolarization-and-electromechanical-dynamics
#15
Vrishti M Phadumdeo, Seth H Weinberg
Heart rate continuously varies due to autonomic regulation, stochasticity in pacemaking, and circadian rhythm, collectively termed heart rate variability (HRV), during normal physiological conditions. Low HRV is clinically associated with an elevated risk of cardiac arrhythmias. Alternans, a beat-to-beat alternation in action potential duration (APD) and/or intracellular calcium (Ca) transient, is a well-known risk factor associated with cardiac arrhythmias that is typically studied under conditions of a constant pacing rate, i...
January 11, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29335917/basal-sympathetic-predominance-in-periodic-limb-movements-in-sleep-after-continuous-positive-airway-pressure
#16
Meng-Ni Wu, Chiou-Lian Lai, Ching-Kuan Liu, Chen-Wen Yen, Li-Min Liou, Cheng-Fang Hsieh, Ming-Ju Tsai, Sharon Chia-Ju Chen, Chung-Yao Hsu
PURPOSE: This study investigated the basal autonomic regulation in patients with obstructive sleep apnea (OSA) showing periodic limb movements in sleep (PLMS) emerging after therapy with continuous positive airway pressure (CPAP). METHODS: Data of patients with OSA undergoing a first polysomnography for diagnosis and a second polysomnography for therapy with CPAP were reviewed. Patients with OSA showing PLMS on the first polysomnography were excluded. By using heart rate variability analysis, epochs without any sleep events and continuous effects from the second polysomnography were retrospectively analyzed...
January 15, 2018: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29333515/changes-in-autonomic-nervous-system-activity-after-treatment-with-alpha-blocker-in-men-with-lower-urinary-tract-symptoms
#17
Kang Hee Shim, Tae Woo Kim, Byung Ha Chung, Sung Won Lee, Jong Kwan Park, Kwangsung Park, Jun Cheon, Kyung Seop Lee, Hyung-Jee Kim, Do-Hwan Seong, Seung-June Oh, Sae Woong Kim, Ji Youl Lee, Seol Ho Choo, Jong Bo Choi
Purpose: To determine changes in autonomic nervous system activity after treatment in men with lower urinary tract symptoms (LUTS), we evaluated changes in patients' symptoms, uroflowmetry, and heart rate variability (HRV) after treatment with alpha-blockers for 12 weeks. Materials and Methods: Ninety-five men who had LUTS (International Prostate Symptom Score [IPSS] ≥8) were included in this study. We divided them into two groups on the basis of a low frequency/high frequency (LF/HF) ratio of 1...
January 2018: Investigative and Clinical Urology
https://www.readbyqxmd.com/read/29333483/how-heart-rate-variability-affects-emotion-regulation-brain-networks
#18
Mara Mather, Julian Thayer
Individuals with high heart rate variability tend to have better emotional well-being than those with low heart rate variability, but the mechanisms of this association are not yet clear. In this paper, we propose the novel hypothesis that by inducing oscillatory activity in the brain, high amplitude oscillations in heart rate enhance functional connectivity in brain networks associated with emotion regulation. Recent studies using daily biofeedback sessions to increase the amplitude of heart rate oscillations suggest that high amplitude physiological oscillations have a causal impact on emotional well-being...
February 2018: Current Opinion in Behavioral Sciences
https://www.readbyqxmd.com/read/29332747/effects-of-spinal-manipulation-and-myofascial-techniques-on-heart-rate-variability-a-systematic-review
#19
Bruno Luis Amoroso Borges, Gustavo Luiz Bortolazzo, Hugo Pasin Neto
BACKGROUND: The analysis of heart rate variability is important to the investigation of stimuli from the autonomic nervous system. Osteopathy is a form of treatment that can influence this system in healthy individuals as well as those with a disorder or disease. OBJECTIVES: The aim of the present study was to perform a systematic review of the literature regarding the effect of spinal manipulation and myofascial techniques on heart rate variability. METHODS: Searches were performed of the Pubmed, Scielo, Lilacs, PEDro, Ibesco, Cochrane and Scopus databases for relevant studies...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29331535/estrogen-deprivation-aggravates-cardiometabolic-dysfunction-in-obese-insulin-resistant-rats-through-the-impairment-of-cardiac-mitochondrial-dynamics
#20
Wanitchaya Minta, Siripong Palee, Duangkamol Mantor, Wissuta Sutham, Thidarat Jaiwongkum, Sasiwan Kerdpoo, Wasana Pratchayasakul, Sirinart Kumfu, Siriporn C Chattipakorn, Nipon Chattipakorn
The incidence of cardiovascular disease and metabolic syndrome increases after the onset of menopause, suggesting estrogen has a vital role in their prevention. Mitochondrial dynamics are known to play an important role in the maintenance of cardiac physiological function. However, the effects of estrogen deprivation on cardiometabolic status and cardiac mitochondrial dynamics under conditions of obese-insulin resistance have never been investigated. We hypothesized that estrogen deprivation aggravates cardiac dysfunction through increased cardiac mitochondrial fission in obese-insulin resistant rats...
January 10, 2018: Experimental Gerontology
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