Arrhythmia, Sinus

Publication Title: 
Psychosomatic Medicine

OBJECTIVE: To examine associations between autonomic nervous system and adrenocortical reactivity to laboratory stressors and buccal cell telomere length (BTL) in children. METHODS: The study sample comprised 78 children, aged 5 to 6 years, from a longitudinal cohort study of kindergarten social hierarchies, biologic responses to adversity, and child health. Buccal cell samples and reactivity measures were collected in the spring of the kindergarten year. BTL was measured by real-time polymerase chain reaction, as the telomere-to-single-copy gene ratio.

Author(s): 
Kroenke, Candyce H.
Epel, Elissa
Adler, Nancy
Bush, Nicole R.
Obradovic, Jelena
Lin, Jue
Blackburn, Elizabeth
Stamperdahl, Juliet Lise
Boyce, W. Thomas
Publication Title: 
Psychosomatic Medicine

OBJECTIVE: To examine associations between autonomic nervous system and adrenocortical reactivity to laboratory stressors and buccal cell telomere length (BTL) in children. METHODS: The study sample comprised 78 children, aged 5 to 6 years, from a longitudinal cohort study of kindergarten social hierarchies, biologic responses to adversity, and child health. Buccal cell samples and reactivity measures were collected in the spring of the kindergarten year. BTL was measured by real-time polymerase chain reaction, as the telomere-to-single-copy gene ratio.

Author(s): 
Kroenke, Candyce H.
Epel, Elissa
Adler, Nancy
Bush, Nicole R.
Obradovic, Jelena
Lin, Jue
Blackburn, Elizabeth
Stamperdahl, Juliet Lise
Boyce, W. Thomas
Publication Title: 
Emotion (Washington, D.C.)

Emerging evidence suggests that high resting heart rate variability in the respiratory frequency band, or respiratory sinus arrhythmia (RSA) may capture individual differences in the capacity to engage in situationally appropriate regulation of affect and behavior. The authors therefore hypothesized that high RSA may act as a protective factor against difficulties controlling negative affect and hostile behaviors in conflicts with romantic partners in highly rejection-sensitive individuals--a population otherwise vulnerable to these responses.

Author(s): 
Gyurak, Anett
Ayduk, Ozlem
Publication Title: 
Emotion (Washington, D.C.)

Periods of bond formation are accompanied by physiological and emotional changes, yet, little is known about the effects of falling in love on the individual's physiological response to emotions. We examined autonomic reactivity to the presentation of negative and positive films in 112 young adults, including 57 singles and 55 new lovers who began a romantic relationship 2.5 months prior to the experiment Autonomic reactivity was measured by Respiratory Sinus Arrhythmia (RSA) to two baseline emotionally neutral films, two negative films, and two positive films.

Author(s): 
Schneiderman, Inna
Zilberstein-Kra, Yael
Leckman, James F.
Feldman, Ruth
Publication Title: 
Emotion (Washington, D.C.)

Although dozens of studies have examined the autonomic nervous system (ANS) aspects of negative emotions, less is known about ANS responding in positive emotion. An evolutionary framework was used to define five positive emotions in terms of fitness-enhancing function, and to guide hypotheses regarding autonomic responding. In a repeated measures design, participants viewed sets of visual images eliciting these positive emotions (anticipatory enthusiasm, attachment love, nurturant love, amusement, and awe) plus an emotionally neutral state.

Author(s): 
Shiota, Michelle N.
Neufeld, Samantha L.
Yeung, Wan H.
Moser, Stephanie E.
Perea, Elaine F.
Publication Title: 
Biological Psychology

Previous studies suggest depression is a risk factor for all cause mortality, with depressed men at greater risk than depressed women. Diminished cardiac vagal control (CVC) in depressed patients has also been found to increase risk of cardiac mortality. Previous research found that depressed women have higher CVC than depressed men suggesting CVC might be related to the discrepancy in mortality rates between depressed men and women. This finding, however, was in the context of a study with several methodological weaknesses.

Author(s): 
Chambers, Andrea S.
Allen, John J. B.
Publication Title: 
Journal of Affective Disorders

BACKGROUND: Impaired cardiac vagal control (CVC), as indexed by respiratory sinus arrhythmia, has been investigated as a risk factor for major depressive disorder (MDD), but prior findings are mixed with respect to whether impaired CVC predicts greater global depression severity and/or a more severe course of disorder. One possible explanation for mixed findings is that CVC abnormalities in MDD are related more closely to specific depression symptoms than to the syndrome as a whole.

Author(s): 
Rottenberg, Jonathan
Chambers, Andrea S.
Allen, John J. B.
Manber, Rachel
Publication Title: 
Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference

Respiratory sinus arrhythmia (RSA) is largely mediated by the autonomic nervous system through its modulating influence on the heartbeat. We propose an algorithm for quantifying instantaneous RSA as applied to heart beat interval and respiratory recordings under dynamic respiration conditions. The blood volume pressure derived heart beat series (pulse intervals, PI) are modeled as an inverse gaussian point process, with the instantaneous mean PI modeled as a bivariate regression incorporating both past PI and respiration values observed at the beats.

Author(s): 
Kodituwakku, Sandun
Lazar, Sara W.
Indic, Premananda
Brown, Emery N.
Barbieri, Riccardo
Publication Title: 
Medical & Biological Engineering & Computing

Respiratory sinus arrhythmia (RSA) is largely mediated by the autonomic nervous system through its modulating influence on the heart beats. We propose a robust algorithm for quantifying instantaneous RSA as applied to heart beat intervals and respiratory recordings under dynamic breathing patterns. The blood volume pressure-derived heart beat series (pulse intervals, PIs) are modeled as an inverse Gaussian point process, with the instantaneous mean PI modeled as a bivariate regression incorporating both past PIs and respiration values observed at the beats.

Author(s): 
Kodituwakku, Sandun
Lazar, Sara W.
Indic, Premananda
Chen, Zhe
Brown, Emery N.
Barbieri, Riccardo
Publication Title: 
Chest

Failure of the pacemaker is a common complication of pacemaker therapy. Identification of the disorder responsible for the failure to pace is often difficult. An increase in myocardial threshold can result in nonconduction of the artificial impulse, particularly near the end of the life of the battery, when the output of current has started to decline. This report demonstrates such an increase in myocardial resistance which was apparent only upon massage of the carotid sinus.

Author(s): 
Ruffy, R.
Kleiger, R. E.
Krone, R.

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