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heart rate variability and well-being

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https://www.readbyqxmd.com/read/29446206/regression-equations-to-estimate-the-2-min-walk-distance-in-an-adult-asian-population-aged-40-75-years
#1
Fatim T Mirza, Sue Jenkins, Maria Justine, Nola Cecins, Kylie Hill
BACKGROUND AND OBJECTIVE: There is increased use of the 2-min walk test (2MWT) to assess functional exercise capacity. However, the distance achieved during this test may be difficult to interpret in the absence of reference values from a local population. Regression equations to estimate the 2-min walk distance (2MWD) only exist for American and Brazilian populations. The objective of this study was to develop regression equations to estimate the 2MWD in Malaysian adults who were free from major health problems...
February 14, 2018: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/29444412/heart-rate-variability-responses-to-acute-and-repeated-post-exercise-sauna-in-trained-cyclists
#2
Anthony S Leicht, Aaron Halliday, Wade H Sinclair, Shaun D'Auria, Martin Buchheit, Glen P Kenny, Jamie Stanley
Short- to medium-term (i.e. 4-14 days) heating protocols induce physiological adaptations including improved cardiac autonomic modulations, as assessed using heart rate variability, which may contribute to greater exercise performance. Whether similar cardiac autonomic changes occur during an intense heating protocol (sauna) reported to increase plasma volume in athletes remains to be confirmed. This study examined the changes in heart rate and its variability during a single, extreme heat (sauna) exposure and repeated exposures in athletes...
February 14, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29428469/treatment-with-escitalopram-modulates-cardiovascular-function-in-rats
#3
Luiz Fernando Veríssimo, Vinicius Lucca Volpini, Viviane Batista Estrada, Natália Kimie Matsubara, Marcus Vinicius Gomes, Leonardo Barbosa Moraes Resstel, Fernando Morgan Aguiar Correa, Gislaine Garcia Pelosi
Considering depression is three times more common in cardiac patients compared to the normal population and selective serotonin reuptake inhibitors (SSRI) as drug of choice for treating patients with cardiovascular disease and depression, our work aims to evaluate the cardiovascular effects of treatment for 21 days with escitalopram (5 mg/kg/day, ip) in rats. The treatment caused an increase in mean arterial pressure concomitant with a decrease in heart rate. Concerning heart rate variability, there was a significant reduction in the sympathetic component and an elevation of the parasympathetic component, indicating that escitalopram caused an autonomic imbalance with parasympathetic predominance...
February 8, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29425375/impact-of-hypothermic-stress-during-special-operations-training-of-chilean-military-forces
#4
Claudio Nieto Jimenez, Jorge Cajigal Vargas, Vjera Sofia Triantafilo Vladilo, Jose Naranjo Orellana
Introduction: The Chilean Army considers processes that can optimize physical capacities for responding to the impact of situations and given stressors. The study of the effect of hypothermia as a stressor agent (HSA) and its relationship with cardiovascular, hematological, anthropometric, endocrine, and immunological parameters has not been fully addressed experimentally in military populations. Objective: To identify the endocrine, hematological, cardiovascular, and immunological changes caused by HSA and to associate these variables with body composition and physical fitness in the military special operation courses of the Chilean Army...
February 7, 2018: Military Medicine
https://www.readbyqxmd.com/read/29424634/optimization-of-anfis-using-a-genetic-algorithm-for-physical-work-rate-classification
#5
Ehsanollah Habibi, Mina Salehi, Ghasem Yadegarfar, Ali Taheri
PURPOSE: Recently, a new method was proposed for physical work rate classification based on an adaptive neuro-fuzzy inference system (ANFIS). This study aims to present a genetic algorithm (GA) optimized ANFIS model for a high accurate classification of physical work rate. MATERIALS AND METHODS: Thirty healthy men participated in this study. The heart rate and the oxygen consumption of the participants were measured directly during a step test and a maximal treadmill test...
February 9, 2018: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/29417836/heart-rate-variability-as-a-marker-of-distress-and-recovery-the-effect-of-brief-supportive-expressive-group-therapy-with-mindfulness-in-cancer-patients
#6
HyeYoun Park, Sohee Oh, Yumi Noh, Ju Young Kim, Jeong-Hyun Kim
OBJECTIVES: We aimed to investigate the effects of brief supportive expressive group therapy with mindfulness for cancer patients and to assess the utility of heart rate variability (HRV) as a biomarker of distress and treatment effect. METHODS: A total of 28 female patients with nonmetastatic cancer at a university hospital in South Korea received a 4-week modified group therapy for distress reduction. The BESTMIND (Brief Expression and Support Therapy with Mindfulness) program consisted of supportive-expressive group therapy and mindfulness-based stress reduction...
February 1, 2018: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/29392084/cardiovascular-risk-factors-are-correlated-with-low-cognitive-function-among-older-adults-across-europe-based-on-the-share-database
#7
Joana Lourenco, Antonio Serrano, Alice Santos-Silva, Marcos Gomes, Claudia Afonso, Paula Freitas, Constanca Paul, Elisio Costa
Increased life expectancy is associated with a high prevalence of chronic, non-communicable diseases including cognitive decline and dementia. The purpose of this study was to evaluate the prevalence of cognitive impairment using three cognitive abilities (verbal fluency, numeracy and perceived memory) and their association with cardiovascular risk factors in seniors across Europe. Data from participants in wave 4 of the SHARE (Survey of Health, Ageing, and Retirement in Europe) database was used. Cognitive performance in perceived memory, verbal fluency and numeracy was evaluated using simple tests and a memory complaints questionnaire...
February 2018: Aging and Disease
https://www.readbyqxmd.com/read/29388764/comparative-cardiopulmonary-effects-of-particulate-matter-and-ozone-enhanced-smog-atmospheres-in-mice
#8
Mehdi Hazari, Kimberly Stratford, Q Todd Krantz, Charly King, Jonathan Krug, Aimen Farraj, M Ian Gilmour
This study was conducted to compare the cardiac effects of particulate matter (PM)-enhanced (SA-PM) and ozone(O3)-enhanced (SA-O3) smog atmospheres in mice. We hypothesized that SA-O3 would cause greater cardiac dysfunction than SA-PM based on our previous findings that when comparing whole and filtered air pollution mixtures, the latter causes greater acute cardiac effects in rodents. Radiotelemetered mice were exposed once whole-body to either SA-PM, SA-O3, or filtered air (FA) for 4 hours. Heart rate (HR) and electrocardiogram were recorded continuously before, during and after exposure...
February 1, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29359592/performance-and-physiological-analysis-of-500-km-non-stop-cycling-a-case-study
#9
Pedro L Valenzuela, Carl Foster, Alejandro Lucía, Pedro de la Villa
Ultra-endurance sports have gained popularity over the last years. In this case, a well-trained cyclist completed 503.5 km non-stop (33.3 km.h-1). Speed and power output were reduced during the trial, being the reduction of power attributable to changes in pedal velocity rather than pedal forces. Heart rate (HR) showed an initial cardiovascular drift and progressively decreased independently of power. A decreased HR variability, a marked inflammatory response, signs of muscle damage and alterations of the haematological profile were observed after the trial...
January 23, 2018: Research in Sports Medicine
https://www.readbyqxmd.com/read/29357499/effects-of-hypothermia-and-rewarming-on-cardiovascular-autonomic-control-in-vivo
#10
Erik Sveberg Dietrichs, Brage Håheim, Timofei Kondratiev, Erik Traasdahl, Torkjel Tveita
BACKGROUND: Rewarming from accidental hypothermia is associated with cardiovascular dysfunction that complicates rewarming and contributes to a high mortality rate. We investigated autonomic cardiovascular control, as well as the separate effects of cooling, hypothermia and rewarming on hemodynamic function, aiming to provide knowledge of the pathophysiology causing such complications in these patients. METHODS: A rat model designed for circulatory studies during cooling, hypothermia (15{degree sign}C) and rewarming was used...
December 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29357481/repeated-testing-for-the-assessment-of-individual-response-to-exercise-training
#11
Anne Hecksteden, Werner Pitsch, Friederike Rosenberger, Tim Meyer
Observed response to regular exercise training differs widely between individuals even in tightly controlled research settings. However, the respective contributions of random error and true interindividual differences as well as the relative frequency of non-responders are disputed. Specific challenges of analyses on the individual level as well as a striking heterogeneity in definitions may partly explain these inconsistent results. Repeated testing during the training phase specifically addresses the requirements of analyses on the individual level...
January 11, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29352276/arrhythmogenic-drugs-can-amplify-spatial-heterogeneities-in-the-electrical-restitution-in-perfused-guinea-pig-heart-an-evidence-from-assessments-of-monophasic-action-potential-durations-and-jt-intervals
#12
Oleg E Osadchii
Non-uniform shortening of the action potential duration (APD90) in different myocardial regions upon heart rate acceleration can set abnormal repolarization gradients and promote arrhythmia. This study examined whether spatial heterogeneities in APD90 restitution can be amplified by drugs with clinically proved proarrhythmic potential (dofetilide, quinidine, procainamide, and flecainide) and, if so, whether these effects can translate to the appropriate changes of the ECG metrics of ventricular repolarization, such as JT intervals...
2018: PloS One
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
#13
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
#14
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/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/29333483/how-heart-rate-variability-affects-emotion-regulation-brain-networks
#16
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/29326171/abdominal-vagal-afferents-modulate-the-brain-transcriptome-and-behaviors-relevant-to-schizophrenia
#17
Melanie Klarer, Jean-Philippe Krieger, Juliet Richetto, Ulrike Weber-Stadlbauer, Lydia Günther, Christine Winter, Myrtha Arnold, Wolfgang Langhans, Urs Meyer
Reduced activity of vagal efferents has long been implicated in schizophrenia and appears to be responsible for diminished parasympathetic activity and associated peripheral symptoms such as low heart rate variability and cardiovascular complications in affected individuals. In contrast, only little attention has been paid to the possibility that impaired afferent vagal signaling may be relevant for the disorder's pathophysiology as well. The present study explored this hypothesis using a model of subdiaphragmatic vagal deafferentation (SDA) in male rats...
January 11, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29324576/intermittent-cooling-during-judo-training-in-a-warm-humid-environment-reduces-autonomic-and-hormonal-impact
#18
Eduardo Carballeira, José Morales, David H Fukuda, María L Granada, Vicente Carratalá-Deval, Alfonso López Díaz de Durana, Jeffrey R Stout
The purpose of this study was to identify the effects of superficial cooling on physiological responses while training in a warm, humid environment during an international judo training camp. Sixteen judokas (8 women and 8 men) participated in the experiment. Four high-level women and four men were randomly assigned to wear a cooling vest (vest group, VG) during the recovery periods within a training session (i.e. 8 bouts of 5 min fighting with 5 min rest) and up to 10 min after the session, while the remaining athletes in the control group (CG) trained without the use of any cooling aids...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29320537/correlation-of-a-new-index-reflecting-the-fluctuation-of-parasympathetic-tone-and-fetal-acidosis-in-an-experimental-study-in-a-sheep-model
#19
C Garabedian, Y Clermont-Hama, D Sharma, E Aubry, L Butruille, P Deruelle, L Storme, J De Jonckheere, V Houfflin-Debarge
The autonomic nervous system plays a leading role in the control of fetal homeostasis. Fetal heart rate variability (HRV) analysis is a reflection of its activity. We developed a new index (the Fetal Stress Index, FSI) reflecting parasympathetic tone. The objective of this study was to evaluate this index as a predictor of fetal acid-base status. This was an experimental study on chronically instrumented fetal lambs (n = 11, surgery at 128 +/- 2 days gestational age, term = 145 days). The model was based on 75% occlusion of the umbilical cord for a maximum of 120 minutes or until an arterial pH ≤ 7...
2018: PloS One
https://www.readbyqxmd.com/read/29315578/hcn4-pacemaker-channels-attenuate-the-parasympathetic-response-and-stabilize-the-spontaneous-firing-of-sinoatrial-node
#20
Yuko Kozasa, Noriyuki Nakashima, Masayuki Ito, Taisuke Ishikawa, Hiroki Kimoto, Kazuo Ushijima, Naomasa Makita, Makoto Takano
The heart rate is dynamically controlled by the sympathetic and parasympathetic nervous systems that regulate the sinoatrial node (SAN). HCN4 pacemaker channels are well-known causative molecule of congenital sick sinus syndrome. Although HCN4 channels are activated by cAMP, the sympathetic response of SAN was preserved in the patients carrying loss-of-function mutations of HCN4 gene. In order to clarify the contribution of HCN4 channels in the autonomic regulation of SAN, we developed novel gain-of-function mutant mice in which expression level of HCN4 channels could be reversibly changed from zero to ∼3 times of that in wild type mice, using tetracycline trans-activator and tetracycline responsive element...
January 9, 2018: Journal of Physiology
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