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Topic: Heart rate variability

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	Heart Rate Variability
		RSA is predominantly mediated by respiratory gating of parasymphathetic efferent activity to the heart: vagal efferent traffic to the sinus node occurs primarily in phase with expiration and is absent or attenuated during inspiration.
		However, because HRV is a cardiac measure derived from the ECG, it is not possible to distinguish reduced central vagal activity (in the vagal centers of the brain) from reduced peripheral activity (the contribution of the target organ -- the sinus node -- or the afferent/efferent pathways conducting the neural impulses to/from the brain).
		Although resting heart rate does not change significantly with advancing age, there is a decline in HRV, which has been attributed to a decrease in efferent vagal tone and reduced beta-adrenergic responsiveness.
	www.macses.ucsf.edu /Research/Allostatic/notebook/heart.rate.html (0 words)

	Heart rate variability. Mashin V.A.
		In the paper, outcomes of the researches devoted to factor analysis of heart rate variability parameters and definition of the most informative parameters for diagnostics of functional states and an evaluation of level of stability to mental loads, are presented.
		By results of psychophysiological examinations and heart rate variability spectral analysis during sessions of psychological relaxation of the NPP operators the physiological indicators of such negative functional states as asthenia, depression, and neurotic symptoms are substantiated.
		The values of heart rate variability indexes under the data of spectral analysis for definition of levels of a centralization, vegetative balance and total power of a spectrum, index of an functional reserve are adduced.
	web.vrn.ru /mva/index_en.html (2237 words)

	Heart Rate Variability in Healthy Children
		Analysis of heart rate variability is prominent among modern methodological approaches to assessment of the state of cardiovascular system and the body as a whole.
		For this reason,of special interest are the results of investigation of parameters of heart rate variability in short recordings obtained from children of different ages.
		We examined the heart rate variability in 6-to 16-year-old children with the aim of obtaining normal values of indices suitable for express-estimation of the state of cardiovascular system.
	heart-rate.narod.ru /heart-rate-variability.htm (272 words)

	Heart Rate Variability - An Indicator of Autonomic Function and Physiological Coherence
		Heart rate variability (HRV), derived from the electrocardiogram (ECG), is a measurement of these naturally occurring, beat-to-beat changes in heart rate.
		The normal variability in heart rate is due to the synergistic action of the two branches of the ANS, which act in balance through neural, mechanical, humoral and other physiological mechanisms to maintain cardiovascular parameters in their optimal ranges and to permit appropriate reactions to changing external or internal conditions.
		Thus, the study of heart rate variability is a powerful, objective and noninvasive tool to explore the dynamic interactions between physiological, mental, emotional and behavioral processes.
	www.heartmath.org /research/science-of-the-heart/soh_13.html (0 words)

	Heart Rate Variability with Heart Rhythm Meditation
		The regularity of this heart rate will cause transmission to occur, broadcasting this slow and peaceful rhythm through the magnetic field into other people and creating the same waves in them.
		The breath rate is also shown in this graph, as it's the breath that causes the heart rate to increase (exhalation) and decrease (inhalation).
		The heart rate is never perfectly constant; the heart rate carries a message to the whole body, describing the person's emotional state.
	www.appliedmeditation.org /Heart_Rhythm_Practice/heart_rate_variability.shtml (524 words)

	ScienceDaily: Low Heart Rate Variability In Depressed Patients Contributes To High Mortality After Heart Attack
		Abnormal heart rate variability is one of the reasons why depression has a negative effect on heart attack patient outcomes.
		Depressed heart patients tended to be at greater risk more than 12 months after their heart attacks.
		So in addition to looking at omega-3 fatty acids to treat depression and heart rate variability, he says it also will be important for researchers to identify other mechanisms through which depression increases the risk of death in the months after a heart attack.
	www.sciencedaily.com /releases/2005/07/050712140254.htm (0 words)

	Circadian Rhythm of Heart Rate Variability Is Reversibly Abolished in Ischemic Stroke -- Korpelainen et al. 28 (11): ...
		Circadian Rhythm of Heart Rate Variability Is Reversibly Abolished in Ischemic Stroke -- Korpelainen et al.
		Circadian Rhythm of Heart Rate Variability Is Reversibly Abolished in Ischemic Stroke
		of heart rate variability is reversibly abolished in the acute
	stroke.ahajournals.org /cgi/content/abstract/strokeaha;28/11/2150 (0 words)

	CiteULike: Contribution to Heart Rate Variability by Mechanoelectric Feedback: Stretch of the Sinoatrial Node Reduces ...
		An increased risk of sudden death and arrhythmia is associated with reduced heart rate variability in heart failure.
		In heart failure, there is also dilatation of the atria, which raises the prospect that there could be some physiological basis to possibly link heart rate variability with atrial dilatation.
		This may account in part for the reduced heart rate variability seen in clinical conditions in which the right atrium is dilated, such as congestive cardiac failure.
	www.citeulike.org /user/weihuil/article/713309 (0 words)

	Heart Rate Variability
		HRV analysis is based on measuring variability in heart rate; specifically, variability in intervals between R waves - “RR intervals”.
		The problem of SNS-PSNS quantification, which has remained for many years the principal dilemma of HRV analysis, is specifically in reducing all possible variations of these multiple parameters to a quantitative relationship between only two parameters: SNS and PSNS.
		Due to its highly sophisticated HRV analysis, Nerve-Express is the only system that enables quantification of 74 ANS states with a corresponding qualitative description for each one.
	www.nervexpress.com (0 words)

	[No title]
		When 135 heart patients tracked their moods for 2 days while wearing portable heart monitors, scientists found that "as stress increased, heart rate variability--the heart's ability to beat faster or slower in response to emotion or physical demands--decreased," notes researcher Simon Bacon, PhD, of Hôpital du Sacré-Coeur in Montreal.
		Heart rate variability (HRV) is a cutting-edge measurement of cardiovascular health.
		Less HRV means nerves and heart muscle can't respond easily to change, potentially leading to out-of-rhythm beats or an abrupt, fatal stop.
	www.wilddivine.com /Prevention_Reprint_HRV (0 words)

	Heart Rate Monitor, Omron accurate Heart Rate Monitor watch — HM International
		A heart rate monitor is a device that allows a user to monitor their heart rate while exercising.
		Strapless heart rate monitors are available as well, but lack some of the functionality of the original design.
		When a heart beat is detected a radio signal is sent out which the receiver uses to determine the current heart rate.
	www.hmint.com /Pages/hrmonitor.htm (573 words)

	bibliography - heart rate variability
		Heart rate dynamics in patients with stable angina pectoris and utility of fractal and complexity measures.
		Increase in heart rate precedes episodes of ventricular tachycardia and ventricular fibrillation in patients with implantable cardioverter defibrillators: analysis of spontaneous ventricular tachycardia database.
		Heart rate variability is independent of age, gender, and race in congestive heart failure with a recent acute exacerbation.
	www.agnld.uni-potsdam.de /~niels/hrv.html (3689 words)

	:: B M I A :: Articles
		Heart rate variability refers to the regulation of the sinoatrial node the natural pacemaker of the heart by the sympathetic and parasympathetic branches of the autonomic nervous system.
		The rhythm of the heart is primarily under the control of the vagus nerve, which inhibits heart rate and the force of contraction.
		HRV is important because it provides a window to observe the heart's ability to respond to normal regulatory impulses that affect its rhythm.
	www.behavioural-medicine.com /articles/hrv/001.html (1492 words)

	Heart Rate Variability with Heart Rhythm Meditation
		The regularity of this heart rate will cause transmission to occur, broadcasting this slow and peaceful rhythm through the magnetic field into other people and creating the same waves in them.
		The breath rate is also shown in this graph, as it's the breath that causes the heart rate to increase (exhalation) and decrease (inhalation).
		The heart rate is never perfectly constant; the heart rate carries a message to the whole body, describing the person's emotional state.
	www.heart-rhythm.org /Heart_Rhythm_Practice/heart_rate_variability.shtml (524 words)

	Polar Glossary
		Heart rate variability (HRV) is the variation in times between successive heartbeats i.e.
		HRV of a well-conditioned heart is generally large at rest.
		During exercise, HRV decreases as the heart rate and exercise intensity increase.
	www.polar.fi /polar/channels/eng/glossary/Heart_rate_variability.html (35 words)

	Heart And Circulation Center - News & Articles About Blood Circulation in the Heart (Site not responding. Last check: )
		More important, however, is the change in rate due to one of two processes: (1) frequent activation in response to acute stress; and (2) inadequate response, due to over-activity of the sympathetic control of cardiac rhythm, the vagus nerve.
		As we have seen, HRV appears to be sensitive and responsive to acute, and possibly chronic, stress.
		HRV was assessed once weekly for a month before the supplements were started, and then on alternate days for the 5 months of the study proper.
	www.healthandage.com /public/health-center/9/article-home/3070/Improve-Your-Heart-Rate-Variability.html (718 words)

	Heart Rate Variability
		Specifically, HRV is a measurement of the interaction between sympathetic (i.e., "fight or flight" energy mobilization) and parasympathetic (i.e., the opposite of the sympathetic activity or "relaxation" response) activity in autonomic functioning (i.e., the nervous system that controls the heart, intestines, and other organs).
		HRV measurements must be done in standardized conditions in order for the data to be reliable and valid.
		For example, benefits in HRV have been found from psychotropic medications which correlate to symptom reduction (Roose et al., 1998; it should be noted that drugs with anticholinergic effects actually decrease HRV, while still being associated with a reduction in symptomatology).
	www.geocities.com /pseudoscience_2000/hrv.html (1580 words)

	Stress Management - Heart Rate Variability FAQ (Site not responding. Last check: )
		Heart rate variability, or HRV, is the natural rise and fall of your heart rate in response to your breathing, blood pressure, hormones and even emotions.
		Research has shown that HRV is a valuable indicator and predictor of "burnout" states that result in the inability of the body to respond to external and internal stress.
		A lack of variability is often seen in coronary artery disease, myocardial infarction, congestive heart failure, hypertension, and arrhythmias as well as an increase in opportunistic infections (herpes, colds, and flu).
	www.cardiologix.com /Faq/HRV_faq.htm (454 words)

	Heart rate variability
		The heart rate may be increased by slow acting sympathetic activity or decreased by fast acting parasympathetic (vagal) activity.
		The heart rate is given by the reciprocal of the RR-interval in units of beats per minute.
		Spectral analysis of the RR tachogram is typically used to estimate the effect of the sympathetic and parasympathetic modulation of the RR-intervals.
	www.physionet.org /physiotools/ecgsyn/paper/node3.html (327 words)

	Heart Rhythms and Heart Rate Variability (HRV) Training
		Heart activity correlates to our emotions, stress, motivational levels, personality and social factors and at every living moment, there is implicit conditioning and interaction between the heart and the brain.
		The normal variability in heart rate, which can be determined from the electrocardiogram (ECG), or from the pulse wave, is due to the synergistic action of the two branches of the ANS.
		Measuring heart rate variability is an effective, objective and non-invasive method providing a dynamic window into autonomic function and balance, thus affording an objective measure of an individual’s emotional state by assessing interactions that take place between the physiological, emotional, mental and behavior processes.
	home.iprimus.com.au /rboon/HeartRhythmsandHRV.htm (3935 words)

	Abnormal Heart Rate Variability as a Manifestation of Autonomic Dysfunction in Hemispheric Brain Infarction -- ...
		Abnormal Heart Rate Variability as a Manifestation of Autonomic Dysfunction in Hemispheric Brain Infarction -- Korpelainen et al.
		abnormalities and of heart rate variability in long-term ECG
		Distorted heart rate variability in the acute phase of stroke
	stroke.ahajournals.org /cgi/content/abstract/strokeaha;27/11/2059 (0 words)

	Heart Rate Variability Assessment Early After Acute Myocardial Infarction : Pathophysiological and Prognostic ...
		Heart Rate Variability Assessment Early After Acute Myocardial Infarction : Pathophysiological and Prognostic Correlates -- Singh et al.
		Heart rate variability measures were lower in anterior
		Comparison of the acute effects of salbutamol and terbutaline on heart rate variability in adult asthmatic patients
	circ.ahajournals.org /cgi/content/abstract/circulationaha;93/7/1388 (686 words)

	Low heart rate variability in depressed patients contributes to high mortality after heart attack
		Low heart rate variability in depressed patients contributes to high mortality after heart attack
		Scientists have known for years that depression increases the risk of dying in the months after a heart attack, but they haven't understood how depression raises that risk.
		They say treatments to alleviate symptoms of depression and correct defects in heart rate variability will offer the best hope for improved survival in depressed patients with coronary heart disease.
	www.medicalnewstoday.com /medicalnews.php?newsid=27341 (0 words)

	Heart Rate Variability Analysis and Stress Management Software and Hardware
		Biocom Technologies offers a full spectrum of products for comprehensive HRV Analysis, that are being used around the world.
		Our products can be used for monitoring physiologic reactions to various treatments, therapies and external events that cause psychophysiologic responses.
		Heart Rate Variability data comparison to the population norms
	www.biocomtech.com (0 words)

	Heart rate variability analysis software
		Heart Rate Recording is performed with the help of HeartSense Instrumentation.
		Currently existing software and instrumentation designed to perform analysis of heart rate variability are not flexible enough and, consequently, not always suitable for scientific research.
		ORTO Science is specially created for investigations of heart rate variability in the field of human physiology, medicine, sports, valeology.
	www.orto.ru /en/science.shtml (246 words)

	Freezeframe Heart rate variability RSA system
		Heart rate variability (HRV) is a measure of these beat-to-beat changes in heart rate as the heart speeds up and slows down in different patterns.
		These heart rate changes are influenced by almost anything the brain and mind process, such as thoughts and sounds, but they are especially influenced by your emotions.
		Figure B illustrates the heart rate variability pattern of frustration or anger (top) which is characterized by its random, jerky pattern.
	www.futurehealth.org /Freezeframe.htm (4222 words)

	On Heart Rate Variability And CHIME
		Heart rate variability relates to the issue that your heart does not beat at the same rate all of the time.
		This ability to change heart rate is a measure of your ability to adapt to changes in the environment.
		Thus, as a simplification, decreased heart rate variability is bad (implies decreased ability to respond to changes in the envornment) and increased heart rate variability is good.
	sids-network.org /experts/chime.htm (586 words)

	MEDLINE_1966-1995 - Resultado de la búsqueda <página 1>
		Heart rate variability and its relation to ventricular arrhythmias in congestive heart failure.
		BACKGROUND--It has been shown that heart rate variability is decreased in patients with congestive heart failure and that depressed heart rate variability is associated with a propensity to ventricular arrhythmias.
		METHODS--Spectral heart rate variability was analysed from 24 hour ambulatory electrocardiograms in 15 controls, 15 patients with non-sustained ventricular tachycardia associated with clinically normal hearts (NHVT group), and 40 patients with congestive heart failure (CHF group) secondary to either ischaemic heart disease (n = 15) or idiopathic dilated cardiomyopathy (n = 25).
	www.bireme.br /cgi-bin/wxislind.exe/iah/online/?IsisScript=iah/iah.xis&nextAction=lnk&base=MEDLINE_1966-1995&exprSearch=8198881&indexSearch=UI&lang=e (187 words)

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