Read by QxMD icon Read

Heart rate variability

Annika Clamor, Julian Koenig, Julian F Thayer, Tania M Lincoln
Arousal and the way it is coped with are relevant to the emergence of psychotic symptoms. Heart rate variability (HRV) stems from autonomic responses to environmental demands such as stress and is an index of physiological arousal, adaptability, and homeostatic reflexes forming autonomic balance. A randomized-controlled between-subjects trial that compared HRV-biofeedback (BF) to an active relaxation and to a waiting control condition was conducted in a sample with attenuated subclinical psychotic symptoms (N = 84)...
October 11, 2016: Behaviour Research and Therapy
Kevin Kalisz, Ji Buethe, Sachin S Saboo, Suhny Abbara, Sandra Halliburton, Prabhakar Rajiah
Computed tomography is vulnerable to a wide variety of artifacts, including patient- and technique-specific artifacts, some of which are unique to imaging of the heart. Motion is the most common source of artifacts and can be caused by patient, cardiac, or respiratory motion. Cardiac motion artifacts can be reduced by decreasing the heart rate and variability and the duration of data acquisition; adjusting the placement of the data window within a cardiac cycle; performing single-heartbeat scanning; and using multisegment reconstruction, motion-correction algorithms, and electrocardiographic editing...
October 21, 2016: Radiographics: a Review Publication of the Radiological Society of North America, Inc
David Herzig, Moreno Testorelli, Daniela Schäfer Olstad, Daniel Erlacher, Peter Achermann, Prisca Eser, Matthias Wilhelm
BACKGROUND/AIM: There is increasing popularity for athletes to use heart rate variability (HRV) to tailor training. A time-efficient method is HRV assessment during deep sleep. The aim was to validate the selection of deep sleep segments identified by RR-intervals with simultaneous electroencephalography (EEG) recordings and to compare HRV parameters of these segments with those of standard morning supine measurements. METHODS: In 11 world class alpine- skiers, RR-intervals were monitored during ten nights and simultaneous EEGs were recorded in 2-4 nights...
September 26, 2016: International Journal of Sports Physiology and Performance
Daniel J Peart, Andy Hensby, Matthew P Shaw
The purpose of this study was to compare markers of hydration during sub-maximal exercise and subsequent time trial performance when consuming water (PW) or coconut water (CW). There was also a secondary aim to assess the palatability of CW during exercise and voluntary intake during intense exercise. 10 males (age 27.9 + 4.9 years, body mass 78.1 + 10.1kg, average max minute power 300.2 + 28.2W) completed 60-min of sub-maximal cycling followed by a 10-km time trial on two occasions. During these trials participants consumed either PW or CW in a randomised manner, drinking a 250 ml of the assigned drink between 10-15 min, 25-30 min and 40-45 min, and then drinking ad libitum from 55-min until the end of the time trial...
October 21, 2016: International Journal of Sport Nutrition and Exercise Metabolism
Wan-Chun Lu, Nian-Sheng Tzeng, Yu-Chen Kao, Chin-Bin Yeh, Terry B J Kuo, Chuan-Chia Chang, Hsin-An Chang
BACKGROUND: Reduced health-related quality of life in the physical domain (HRQOLphysical) has been reported to increase risks for cardiovascular disease (CVD); however, the mechanism underlying this phenomenon is still unclear. The autonomic nervous system (ANS) that connects the body and mind is a biologically plausible candidate to investigate this mechanism. The aim of our study is to examine whether the HRQOLphysical independently contributes to heart rate variability (HRV), which reflects ANS activity...
October 21, 2016: Health and Quality of Life Outcomes
Xiuqing Tian, Rui Guo, Yujiao Zhang, Lingling Xu, Xianbing Liu, Yinglong Hou
OBJECTIVE: To observe the effects of sympathetic overactivity on the immune system involved in the imbalance of T helper (Th) lymphocytes, we investigated the correlation between autonomic dysregulation and the generation of regulatory T (Treg) and Th1 chemokines in patients with acute coronary syndrome (ACS). METHODS: Blood samples obtained from patients with coronary artery disease and controls were analyzed for levels of Th1 and Treg cells and their associated cytokines by flow cytometry...
October 21, 2016: Neuroimmunomodulation
Lin Huang, Lluis Capdevila
OBJECTIVE: This study analyzed the efficacy of aromatherapy in improving work performance and reducing workplace stress. SUBJECTS: The initial sample comprised 42 administrative university workers (Mage = 42.21 years, standard deviation = 7.12; 10 male). INTERVENTION: All sessions were performed in a university computer classroom. The participants were randomly assigned into an aromatherapy group (AG) and a control group (CG), and they were invited to participate in a specific session only once...
October 20, 2016: Journal of Alternative and Complementary Medicine: Research on Paradigm, Practice, and Policy
D Stott, M Bolten, D Paraschiv, I Papastefanou, J B Chambers, N A Kametas
OBJECTIVE: Pregnant hypertensive women who do not respond to labetalol but need vasodilatory therapy for blood pressure (BP) control rapidly progress to severe disease, which may be delayed by early recognition and individualised BP treatment. In this study, we sought to create prediction models at presentation, at 1 and 24 hours after commencement of treatment to identify patients who will not show a sustained response to labetalol and therefore need vasodilatory therapy. METHODS: The study population comprised of 134 women presenting with hypertension at a UK hospital...
October 20, 2016: Ultrasound in Obstetrics & Gynecology
Joseph R Isler, Tracy Thai, Michael M Myers, William P Fifer
A novel quantitative method for coding epochs of active and quiet sleep in infants using respiration is reported. The approach uses the variance of the instantaneous breathing rate within brief epochs of sleep. Variances are normalized within subject by dividing by the 75th percentile variance across epochs. Then, a normalized variance active sleep threshold of 0.29 was determined to produce the highest concordance with a method based on visual inspection of respiratory variability (100% and 90% for quiet and active sleep, respectively)...
October 20, 2016: Developmental Psychobiology
Noortje H Rijken, Remko Soer, Ewold de Maar, Hilco Prins, Wouter B Teeuw, Jan Peuscher, Frits G J Oosterveld
The aim of this pilot study was to investigate the effects of an intervention consisting of mental coaching combined with either electro encephalogram (EEG) alpha power feedback or heart rate variability (HRV) feedback on HRV, EEG outcomes and self-reported factors related to stress, performance, recovery and sleep quality in elite athletes. A prospective pilot study was performed with two distinct cohorts. Soccer players were provided with four sessions of mental coaching combined with daily HRV biofeedback (Group A); track and field athletes were provided with four sessions of mental coaching in combination with daily neurofeedback (Group B)...
October 19, 2016: Applied Psychophysiology and Biofeedback
Luigi Baciadonna, Christian Nawroth, Alan G McElligott
Animal emotional states can be investigated by evaluating their impact on cognitive processes. In this study, we used a judgement bias paradigm to determine if short-term positive human-animal interaction (grooming) induced a positive affective state in goats. We tested two groups of goats and trained them to discriminate between a rewarded and a non-rewarded location over nine training days. During training, the experimental group (n = 9) was gently groomed by brushing their heads and backs for five min over 11 days (nine training days, plus two testing days, total time 55 min)...
2016: PeerJ
Raoyrin Chanavirut, Pattarapong Makarawate, Ian A Macdonald, Naruemon Leelayuwat
BACKGROUND: Imbalances of the autonomic nervous (ANS), the cardiovascular system, and ionics might contribute to the manifestation of The Brugada Syndrome (BrS). Thus, this study has aimed to investigate the cardio-respiratory fitness and the responses of the ANS both at rest and during a sub-maximal exercise stress test, in BrS patients and in gender-matched and age-matched healthy sedentary controls. METHODS: Eleven BrS patients and 23 healthy controls were recruited in Khon Kaen, Thailand...
October 2016: Journal of Arrhythmia
Cecilia U D Stenfors, Linda M Hanson, Töres Theorell, Walter S Osika
Objective: Executive cognitive functioning is essential in private and working life and is sensitive to stress and aging. Cardiovascular (CV) health factors are related to cognitive decline and dementia, but there is relatively few studies of the role of CV autonomic regulation, a key component in stress responses and risk factor for cardiovascular disease (CVD), and executive processes. An emerging pattern of results from previous studies suggest that different executive processes may be differentially associated with CV autonomic regulation...
2016: Frontiers in Psychology
Hayley A Young, Heather Watkins
Reducing the glycemic load (GL) of the diet may benefit appetite control but its utility is complicated by psychological influences on eating. Disinhibited behaviour, a risk factor for overconsumption, is characterized by reduced prefrontal cortex activity, which in turn modulates vagal tone; a phenomenon associated with glucoregulation. This double blind randomised controlled trial explored for the first time the influence of disinhibited eating and vagal tone (heart rate variability (HRV)) on hunger and the postprandial response to GL...
October 20, 2016: Scientific Reports
James Gilligan, Bandy X Lee, Shikha Garg, Morkeh Blay-Tofey, Audrey Luo
Many national and international institutions advocate approaching violence as a problem in public health and preventive medicine, in a manner similar to the way we address other disabling and life-threatening pathologies such as cancer, diabetes, and heart disease. Prevention by a health model requires an ecological perspective. Previous work has found evidence that economic factors, including unemployment and relative poverty, as well as political culture and values, may affect violent death rates, including homicide and suicide...
September 2016: Journal of Public Health Policy
Hanna Gustafsson, Colleen Doyle, Michelle Gilchrist, Elizabeth Werner, Catherine Monk
The consequences of childhood maltreatment are profound and long lasting. Not only does the victim of abuse suffer as a child, but there is mounting evidence that a history of maltreatment places the next generation at risk for significant psychopathology. Research identifies postnatal factors as affecting this intergenerational transmission of trauma. However, emerging evidence suggests that part of this risk may be transmitted before birth, passed on via abuse-related alterations in the in utero environment that are as yet largely unidentified...
October 20, 2016: Development and Psychopathology
Kim M J Verdurmen, Alexandra D J Hulsenboom, Judith O E H van Laar, S Guid Oei
INTRODUCTION: Tocolytics may cause changes in fetal heart rate pattern, while fetal heart rate variability is an important marker of fetal wellbeing. We aim to systematically review the literature on how tocolytic drugs affect fetal heart rate variability. MATERIAL AND METHODS: We searched CENTRAL, PubMed, and EMBASE up to June 2016. Studies published in English, using computerized or visual analysis to describe the effect of tocolytics on heart rate variability in human fetuses were included...
October 19, 2016: Journal of Maternal-fetal & Neonatal Medicine
Mustafa Gulgun
No abstract text is available yet for this article.
October 17, 2016: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
Jacinthe Leclerc, Marie Arsenault, Jean-Pierre Després, Patrice Brassard, Valérie Gaudreault, Jean Bergeron, Natalie Alméras, Angelo Tremblay, Audrey Auclair, Marie-Kristelle Ross, Stéphanie Denault-Bissonnette, Paul Poirier
BACKGROUND: Abdominal obesity and presence of the metabolic syndrome (MetS) are associated with cardiac abnormalities. Among those, left ventricular diastolic dysfunction (LVDD) is the most frequently encountered in clinical practice. Few studies evaluated the reversibility of LVDD by an approach promoting lifestyle modifications in abdominally obese subjects with MetS. METHODS: We assessed the impact of a 1-year lifestyle modification program combining nutritional and physical activity counseling on LVDD and metabolic profile of abdominally obese men with MetS...
October 18, 2016: Metabolic Syndrome and related Disorders
Nilson T Poppi, Luís H W Gowdak, Luciana O C Dourado, Eduardo L Adam, Thiago N P Leite, Bruno M Mioto, José E Krieger, Luiz A M César, Alexandre C Pereira
BACKGROUND: The predictors of cardiovascular events in patients with chronic refractory angina are limited. High-sensitivity cardiac troponin T (hs-cTnT) assays are biomarkers that may be used to determine the prognosis of patients with stable coronary artery disease. HYPOTHESIS: Hs-cTnT is a predictor of death and nonfatal myocardial infarction (MI) in patients with refractory angina. METHODS: We prospectively enrolled 117 consecutive patients in this study...
October 18, 2016: Clinical Cardiology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"