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https://www.readbyqxmd.com/read/27914167/statistical-considerations-for-reporting-and-planning-heart-rate-variability-case-control-studies
#1
Daniel S Quintana
The calculation of heart rate variability (HRV) is a popular tool used to investigate differences in cardiac autonomic control between population samples. When interpreting effect sizes to quantify the magnitude of group differences, researchers typically use Cohen's guidelines of small (0.2), medium (0.5), and large (0.8) effects. However, these guidelines were originally proposed as a fallback for when the effect size distribution (ESD) was unknown. Despite the availability of effect sizes from hundreds of HRV studies, researchers still largely rely on Cohen's guidelines to interpret effect sizes and to perform power analyses to calculate required sample sizes for future research...
December 3, 2016: Psychophysiology
https://www.readbyqxmd.com/read/27913593/higher-heart-rate-variability-is-associated-with-vmpfc-activity-and-increased-resistance-to-temptation-in-dietary-self-control-challenges
#2
Silvia U Maier, Todd A Hare
: Higher levels of self-control in decision making have been linked to better psychosocial and physical health. A similar link to health outcomes has been reported for heart rate variability (HRV), a marker of physiological flexibility. Here, we sought to link these two, largely separate, research domains by testing the hypothesis that greater HRV would be associated with better dietary self-control in humans. Specifically, we examined whether total HRV at sedentary rest (measured as the standard deviation of normal-to-normal intervals, SDNN) can serve as a biomarker for the neurophysiological adaptability that putatively underlies self-controlled behavior...
December 2, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27912948/therapeutic-efficacy-of-traditional-chinese-medicine-kuan-sin-yin-in-patients-undergoing-chemotherapy-for-advanced-colon-cancer-a-controlled-trial
#3
Tsai-Ju Chien, Chia-Yu Liu, Ruey-Hwa Lu, Chin-Wei Kuo, Yang-Chao Lin, Chung-Hua Hsu
BACKGROUND: Traditional Chinese Medicine (TCM) has been used increasingly as complementary medicine in cancer care. Kuan-Sin-Yin (KSY) is a TCM decoction containing seven herbs known to cause immunomodulation or anticancer activity, and which are associated with the TCM concept of Qi and energy supply. Kuan-Sin-Yin has cytostatic effects on cancer cells in animal models. OBJECTIVE: The aim of this study is to evaluate the level of improvement in meridian energy and heart-rate variability (HRV) and to assess whether these observations are compatible with TCM theory...
December 2016: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/27912172/brain-heart-communication-evidence-for-central-pacemaker-oscillations-with-a-dominant-frequency-at-0-1hz-in-the-cingulum
#4
Gert Pfurtscheller, Andreas R Schwerdtfeger, Annemarie Seither-Preisler, Clemens Brunner, Christoph Stefan Aigner, Joana Brito, Marciano P Carmo, Alexandre Andrade
OBJECTIVES: In the brain and heart, oscillations at about 0.1Hz are conspicuous. It is therefore worthwhile to study the interaction between intrinsic BOLD oscillations (0.1Hz) and slow oscillations in heart rate interval (RRI) signals and differentiate between their neural and vascular origin. METHODS: We studied the phase-coupling with a 3T scanner with high scanning rate between BOLD signals in 22 regions and simultaneously recorded RRI oscillations in 23 individuals in two resting states...
November 10, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27912162/serotonin-2a-receptor-5-ht2a-gene-promoter-variant-interacts-with-chronic-perceived-stress-to-modulate-resting-parasympathetic-activity-in-humans
#5
Chuan-Chia Chang, Wen-Hui Fang, Hsin-An Chang, Tieh-Ching Chang, Jia-Fwa Shyu, San-Yuan Huang
Decreased resting vagal (parasympathetic) tone is implicated in the development of stress-related disorders, including anxiety and depression. Chronic stress elevates the expression of serotonin 2A receptors (5-HT2A), while activation of 5-HT2A leads to inhibition of parasympathetic synaptic transmission. The T allele of the promoter variant, rs6311 (C>T), of the 5-HT2A gene has been shown to increase the 5-HT2A expression in vitro and to be associated with anxiety and depressive disorders. We thus hypothesized that the 5-HT2A functional polymorphism may influence resting vagal activity among persons with chronically high levels of perceived stress...
November 16, 2016: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27911348/comparison-between-heart-rate-variability-and-pulse-rate-variability-during-different-sleep-stages-for-sleep-apnea-patients
#6
Shuangyan Liu, Jing Teng, Xianghua Qi, Shoushui Wei, Chengyu Liu
BACKGROUND: The usefulness of heart rate variability (HRV) in the clinical research has been verified in numerous studies. However, it is controversy that using pulse rate variability (PRV) as a surrogate of HRV in different clinical applications. OBJECTIVE: We aimed to investigate whether PRV extracted from finger pulse photoplethysmography (Pleth) signal could substitute HRV from ECG signal during different sleep stages by analyzing the common time-domain, frequency-domain and non-linear indices...
November 25, 2016: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/27910248/use-of-heart-rate-variability-and-photoplethysmograph-derived-parameters-as-assessment-signals-of-radiofrequency-therapy-efficacy-for-chronic-pain
#7
Jing-Jhao Ye, Chiung-Cheng Chuang, Yu-Ting Tai, Kuan-Ting Lee, Kuo-Sheng Hung
BACKGROUND: Radiofrequency therapy (RFT) generates molecular motion, and produces heat and electromagnetic effects on tissues, which attenuate pain sensation and thereby relieve pain. This study was to observe the altering trend of physiological parameters after RFT for chronic cervical or lumbar pain. METHODS: This study recruited 66 patients with chronic cervical or lumbar pain, and recorded their physiological parameters before and after RFT by using heart rate variability (HRV) and photoplethysmography (PPG) to explore the feasibility of RFT efficacy assessment...
December 2, 2016: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/27904883/interactions-of-respiratory-viruses-and-the-nasal-microbiota-during-the-first-year-of-life-in-healthy-infants
#8
Insa Korten, Moana Mika, Shkipe Klenja, Elisabeth Kieninger, Ines Mack, Maria Teresa Barbani, Meri Gorgievski, Urs Frey, Markus Hilty, Philipp Latzin
Traditional culture techniques have shown that increased bacterial colonization is associated with viral colonization; however, the influence of viral colonization on the whole microbiota composition is less clear. We thus aimed to understand the interaction of viral infections and the nasal microbiota in early life to appraise their roles in disease development. Thirty-two healthy, unselected infants were included in this prospective longitudinal cohort study within the first year of life. Biweekly nasal swabs (n = 559) were taken, and the microbiota was analyzed by 16S rRNA pyrosequencing, and 10 different viruses and 2 atypical bacteria were characterized by real-time PCR (combination of seven duplex samples)...
November 2016: MSphere
https://www.readbyqxmd.com/read/27901339/cardiac-parasympathetic-reactivation-after-small-sided-soccer-games-and-repeated-sprints-in-untrained-healthy-adolescents
#9
Amri Hammami, Sofien Kasmi, Narimen Yousfi, Marwa Bouamra, Zouhaier Tabka, Ezdine Bouhlel
BACKGROUND: It has been shown that recreational soccer was a highly motivating and social activity which produces large improvements in health-related indices in sedentary healthy and unhealthy subjects. The purpose of this study was to compare the acute parasympathetic reactivation after small-sided soccer games (SSG) and repeated sprints training (RST) sessions. METHODS: Eight post-pubertal untrained adolescents (age 15.8 ± 0.6 years, body mass 59.1 ± 3.7 kg, height 1...
November 30, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27899499/differential-patterns-of-impaired-cardiorespiratory-fitness-and-cardiac-autonomic-dysfunction-in-recently-diagnosed-type-1-and-type-2-diabetes
#10
Martin Röhling, Alexander Strom, Gidon Bönhof, Sonja Püttgen, Kálmán Bódis, Karsten Müssig, Julia Szendrödi, Daniel Markgraf, Stefan Lehr, Michael Roden, Dan Ziegler
OBJECTIVE: Both impaired cardiorespiratory fitness (CRF) and heart rate variability (HRV) are predictors of mortality, but their relative roles in recent-onset diabetes are unknown. We determined to which extent CRF and HRV are reduced and interrelated in recent-onset diabetes. RESEARCH DESIGN AND METHODS: Participants from the German Diabetes Study with type 1 (n = 163) or type 2 (n = 188) diabetes with known diabetes duration <1 year and two age-matched glucose-tolerant control groups (n = 40 each) underwent spiroergometry and HRV assessment during a hyperinsulinemic-euglycemic clamp...
November 29, 2016: Diabetes Care
https://www.readbyqxmd.com/read/27897034/meditative-music-listening-to-reduce-state-anxiety-in-patients-during-the-uptake-phase-before-positron-emission-tomography-pet-scans
#11
Wen-Li Lee, Huei-Chuan Sung, Shu-Hsin Liu, Shu-Min Chang
OBJECTIVE: This study examines the effects of meditative music listening on state anxiety and heart rate variability (HRV) of patients during uptake phase before PET scans. METHODS: A two-group randomized experimental design was used. Eligible patients were randomly assigned to either experimental or control group. All patients received baseline assessments of state anxiety using Spielberger Trait Anxiety Inventory (STAI-S) and HRV before receiving an intravenous injection of radiopharmaceutical fludeoxyglucose in uptake room...
November 29, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27895690/rhinovirus-and-childhood-asthma-an-update
#12
REVIEW
Dae Jin Song
Asthma is recognized as a complex disease resulting from interactions between multiple genetic and environmental factors. Accumulating evidence suggests that respiratory viral infections in early life constitute a major environmental risk factor for the development of childhood asthma. Respiratory viral infections have also been recognized as the most common cause of asthma exacerbation. The advent of molecular diagnostics to detect respiratory viruses has provided new insights into the role of human rhinovirus (HRV) infections in the pathogenesis of asthma...
November 2016: Korean Journal of Pediatrics
https://www.readbyqxmd.com/read/27895588/influence-of-heart-rate-in-non-linear-hrv-indices-as-a-sampling-rate-effect-evaluated-on-supine-and-standing
#13
Juan Bolea, Esther Pueyo, Michele Orini, Raquel Bailón
The purpose of this study is to characterize and attenuate the influence of mean heart rate (HR) on nonlinear heart rate variability (HRV) indices (correlation dimension, sample, and approximate entropy) as a consequence of being the HR the intrinsic sampling rate of HRV signal. This influence can notably alter nonlinear HRV indices and lead to biased information regarding autonomic nervous system (ANS) modulation. First, a simulation study was carried out to characterize the dependence of nonlinear HRV indices on HR assuming similar ANS modulation...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27894284/proarrhythmic-risk-and-determinants-of-cardiac-autonomic-dysfunction-in-collagen-induced-arthritis-rats
#14
Ting-Tse Lin, Yen-Ling Sung, Chih-En Wu, Hong Zhang, Yen-Bin Liu, Shien-Fong Lin
BACKGROUNDS: Patients with rheumatoid arthritis (RA) have increased risk of sudden cardiac death (SCD), which is two-fold higher than general population. The driving cause of SCD was considered due to lift-threatening arrhythmia where systemic inflammation acts as the pathophysiological basis linking RA to autonomicdysfunction. METHODS: To assess the sympathetic over-activity of "inflammatory reflex", we measured heart rate variability (HRV) in a rat collagen-induced arthritis (CIA) model, whose arthritis is induced in Lewis rats by intradermal injection of emulsion of type II collagen...
November 29, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27893998/influenza-and-rhinovirus-viral-load-and-disease-severity-in-upper-respiratory-tract-infections
#15
Andrea Granados, Adriana Peci, Allison McGeer, Jonathan B Gubbay
BACKGROUND: The role of viral load in respiratory viral infection is unclear. It is proposed that the viral load of some, but not all respiratory viruses correlate with disease severity. OBJECTIVES: We aimed to determine if an association exists between viral loads among patients in ambulatory settings, compared to those requiring hospitalization/intensive care unit (ICU) admission with influenza A/H3N2, influenza B, or human rhinovirus (HRV); we also explored the impact of age, gender and co-detection of Streptococcus pneumoniae on patient setting...
November 22, 2016: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/27892761/autonomic-markers-associated-with-generalized-social-phobia-symptoms-heart-rate-variability-and-salivary-alpha-amylase
#16
María J García-Rubio, Laura Espín, Vanesa Hidalgo, Alicia Salvador, Jesús Gómez-Amor
The study of autonomic nervous system changes associated with generalized social phobia (GSP) disorder has increased in recent years, showing contradictory results. The present study aimed to evaluate how young people with GSP reacted before, during, and after exposure to the Trier Stress Social Test (TSST), focusing on their autonomic changes (heart rate variability, HRV, and salivary alpha-amylase, sAA) compared to a control group (non-GSP). Some psychological variables were also considered. Sex was specifically studied as a possible modulator of autonomic fluctuations and psychological state...
November 28, 2016: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/27891509/the-performance-of-short-term-heart-rate-variability-in-the-detection-of-congestive-heart-failure
#17
Fausto Lucena, Allan Kardec Barros, Noboru Ohnishi
Congestive heart failure (CHF) is a cardiac disease associated with the decreasing capacity of the cardiac output. It has been shown that the CHF is the main cause of the cardiac death around the world. Some works proposed to discriminate CHF subjects from healthy subjects using either electrocardiogram (ECG) or heart rate variability (HRV) from long-term recordings. In this work, we propose an alternative framework to discriminate CHF from healthy subjects by using HRV short-term intervals based on 256 RR continuous samples...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27889892/effects-of-mental-stress-induction-on-heart-rate-variability-in-patients-with-panic-disorder
#18
Katja Petrowski, Susann Wichmann, Timo Siepmann, Stefan R Bornstein, Martin Siepmann
Reduced heart rate variability (HRV) constitutes a widely used marker of cardiac autonomic inflexibility which has been linked to disorders such as panic disorder (PD). To date, the pathophysiological mechanisms whereby panic leads to attenuated HRV are not fully elucidated. We aimed to investigate the hypothesis that PD patients show pathological reactivity both in response to interoceptive and psychosocial stress in comparison to healthy individuals. We performed a controlled study on 38 patients diagnosed with PD [20 males and 18 females aged 35...
November 26, 2016: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/27889332/effect-of-an-aerobic-exercise-intervention-on-cardiac-autonomic-regulation-a-worksite-rct-among-cleaners
#19
David M Hallman, Andreas Holtermann, Karen Søgaard, Peter Krustrup, Jesper Kristiansen, Mette Korshøj
OBJECTIVE: The aim of this randomized controlled trial (RCT) was to determine whether aerobic exercise during work hours affects cardiac autonomic regulation in cleaners characterized by high levels of occupational physical activity and poor cardiorespiratory fitness. METHOD: Eligible cleaners (n=116) were randomized to an aerobic exercise group (n=59) or a reference group (n=57) with lectures. The intervention group received two 30-min sessions per week of supervised aerobic exercise over 4months...
November 23, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/27888320/cardiac-mechanics-and-heart-rate-variability-in-patients-with-systemic-sclerosis-the-association-that-we-should-not-miss
#20
Maja Zlatanovic, Marijana Tadic, Vera Celic, Branislava Ivanovic, Ana Stevanovic, Nemanja Damjanov
We aimed to determine left ventricular (LV) and right ventricular (RV) structure, function and mechanics, as well as heart rate variability (HRV), and their relationship, in patients with systemic sclerosis (SSc). The study included 41 SSc patients and 30 age-matched healthy volunteers. All the patients underwent clinical examination, serological tests, pulmonary function testing, 24-h Holter monitoring and complete two-dimensional echocardiography including strain analysis. The parameters of LV structure (interventricular septum thickness and LV mass index) and RV structure (RV wall thickness) were significantly higher in SSc patients...
November 25, 2016: Rheumatology International
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