Divorce is a stressor associated with long-term health risk, though the mechanisms of this effect are poorly understood. Cardiovascular reactivity is one biological pathway implicated as a predictor of poor long-term health after divorce. A sample of recently separated and divorced adults (N = 138) was assessed over an average of 7.5 months to explore whether individual differences in heart rate variability—assessed by respiratory sinus arrhythmia—operate in combination with subjective reports of separation-related distress to predict prospective changes in cardiovascular reactivity, as indexed by blood pressure reactivity. Participants with low resting respiratory sinus arrhythmia at baseline showed no association between divorce-related distress and later blood pressure reactivity, whereas participants with high respiratory sinus arrhythmia showed a positive association. In addition, within-person variation in respiratory sinus arrhythmia and between-persons variation in separation-related distress interacted to predict blood pressure reactivity at each laboratory visit. Individual differences in heart rate variability and subjective distress operate together to predict cardiovascular reactivity and may explain some of the long-term health risk associated with divorce.

Perseverative cognition is the repetitive cognitive representation of a stressor, which includes the concepts of worry and rumination. These thoughts delay post-stress cardiovascular recovery, which may lead to an increased risk for cardiovascular disease. This may be due to the negative emotional content of perseverative cognition or because it involves cognitive effort. The aim of this study was to identify the unique influences of negative emotional content and cognitive effort during recovery. Participants (N = 120) were given a demanding task purportedly as a measure of intelligence and then given false negative feedback. Immediately following, participants engaged in one of four recovery instruction conditions: think about task performance, perform a cognitive load task, watch a distracting video, or remain quietly seated. EKG, impedance cardiography, and blood pressure were recorded throughout. Perseverative cognition and cognitive load both resulted in significantly less heart rate recovery compared to the distracting video. Higher test motivation and anxiety were related to more blunted reactivity and delayed recovery of respiratory sinus arrhythmia. Reduced recovery during perseverative cognition and cognitive effort indicate that the cognitive load produced by perseveration is the pernicious component that explains its link to increased risk for cardiovascular disease. Further, the relationship between motivation/anxiety and blunted reactivity and recovery suggest effort may be important in the link between perseverative cognition and cardiovascular disease.

This mixed-method study investigated the effects of self-directed physiological monitoring on therapists anxiety. Ten therapists participated in a10-week physiological monitoring training sessions while monitoring respiratory sinus arrhythmia (RSA) and heart rate variability (HRV). The participants completed the state-trait anxiety inventory questionnaire after having a first, sixth, or tenth therapy session with a client. This was designed to monitor their state anxiety while working with clients. A series of paired sampled t-tests was conducted to assess changes in HRV, RSA, trait anxiety, and state anxiety. One significant result was found: the RSA of the therapist increased significantly. Correlations existed between the HRV of the therapist increasing and the trait anxiety of the therapist decreasing through RSA training sessions although they were not significant at the .05 level.

Disruptive behavior problems are among the most commonly occurring forms of childhood psychopathology and show considerable stability beginning in early childhood. Investigations of the biological underpinnings of behavior problems have revealed that the influences of the parasympathetic branch of the autonomic nervous system on cardiac functions are central to self-regulation. Parasympathetic regulation of heart rate is indexed via respiratory sinus arrhythmia (RSA). Suppression of RSA during challenging emotional and cognitive tasks is associated with better emotional and behavioral functioning in preschoolers. However, the relationship between RSA suppression and preschool social functioning is still unclear. Further, direct relationships between behavior problems and RSA reactivity within command-based play tasks (i.e., child instructed to build 3 towers) with parents and other adults have yet to be examined. The present study experimentally evaluated the relationship between child RSA reactivity and adult (mother vs. staff) commands requiring child compliance during command-based play tasks in children ages 3-8 with and without disruptive behavior disorders (N=43). Child RSA suppression in response to commands was examined as a predictor of child command compliance during experimental play tasks and of general child behavior problems, and was compared across command-based interactions with mothers versus staff. Less RSA suppression in the context of mothers’ play-based commands was associated with more severe behavioral problems (p=.046). In the context of staff play-based commands, more RSA suppression was associated with more severe behavior problems (p=.009), an effect that was significant only among boys (p<.000). Further, greater child RSA suppression predicted greater compliance with mother-given commands (p=.017), but was unrelated to compliance with staff-given commands. The relationship between child RSA suppression and compliance with mother-given commands was moderated by child age, such that the effect of RSA suppression on child compliance was stronger for younger children than older children. Findings suggest that RSA reactivity to social demands, and the functional association between RSA suppression and behavioral compliance, vary by social context (i.e., mother vs. other adult command-givers) and identify child factors (i.e., age, gender) that influence these associations. This work may inform efforts to identify a biomarker of early childhood behavior problems.

abstract: This study examines the relations among three aspects of temperament (shyness, impulsivity, and effortful control), resting respiratory sinus arrhythmia (RSA) recorded during a calming film and RSA suppression during three behavioral measures of effortful control, and adjustment (anxiety and externalizing behavior) in a sample of 101 preschool-age children. Principal components analysis was used to create composites for effortful control, shyness, impulsivity, anxiety, and externalizing behavior, and hierarchical regression analysis was used to test the study hypotheses. As expected, baseline RSA was negatively related to effortful control in shy children, but was unrelated to effortful control in children who were not shy. It was hypothesized that high baseline RSA would reduce the relation between shyness and anxiety, and between impulsivity and externalizing behavior; this hypothesis was supported for externalizing behavior, but not for anxiety. The interaction between impulsivity and RSA as a predictor of externalizing was statistically independent of effortful control, indicating that these are unique effects. Finally, it was hypothesized that RSA suppression would be positively related to effortful control for children low, but not high, in shyness. There was a marginal interaction between shyness and RSA suppression, with RSA suppression marginally negatively related to EC for children low in shyness, but unrelated to effortful control for children high in shyness; the direction of this association was opposite predictions. These findings indicate that RSA is more strongly related to effortful control for children high in shyness, and that it consequently may not be appropriate to use RSA as an index of EC for all children. This study also draws attention to the need to consider the context in which baseline RSA is measured because a true baseline may not be obtained for shy children if RSA is measured in an unfamiliar laboratory context. The finding that high RSA moderated (but did not eliminate) the relation between impulsivity and externalizing behavior is consistent with the conceptualization of RSA as a measure of self-regulation, but further research is needed to clarify the mechanism underlying this effect. / Dissertation/Thesis / M.A. Psychology 2012

Attention-deficit/hyperactivity disorder (ADHD) likely involves fundamental alterations in self-regulation. These problems typically have been viewed as involving disruptions in the regulation of cognition and behavior. However, they also have been hypothesized to involve disruptions in emotion regulation. If so, parenting behaviors may take on renewed importance in ADHD, because parents play an essential role in children developing the ability to regulate their emotions independently. Three studies examined the association between emotion regulation and ADHD. Study 1 examined autonomic nervous system functioning during the experience and regulation of both positive and negative emotions. Study 2 examined coherence among autonomic and behavioral emotional systems. Finally, Study 3 examined the roles of parenting behavior, parental expressed emotion, and child autonomic nervous system functioning. In Studies 1 and 2, participants with ADHD and typically developing youth aged 7 to 11 years old completed an emotion induction and suppression procedure. For Study 3, participants completed a parent-child interaction task coded for parental behavior, and parents completed a five-minute speech sample coded for expressed emotion. Electrocardiogram and impedance cardiography were monitored for children across all three studies. The following results were notable. In Study 1, children with ADHD showed atypical autonomic inflexibility (i.e., elevated parasympathetic and sympathetic responding across task conditions). Additionally, children with ADHD were divided according to levels of prosocial behavior. Unlike other children with ADHD, children with very low levels of prosocial behavior displayed blunted autonomic activity across task conditions. In Study 2, specific patterns of reduced coherence among emotion regulatory systems (i.e., facial affective behavior and autonomic nervous system reactivity) were observed among children with ADHD. Finally, in Study 3, high levels of parental expressed emotion were associated uniquely with ADHD, even after controlling for comorbid symptoms. In contrast, parental intrusiveness was associated uniquely with child oppositional defiant and low prosocial behavior, even after controlling for ADHD symptoms. Furthermore, specific, different patterns of autonomic reactivity during the parent-child interaction were associated with ADHD and oppositional defiant behaviors. Across these studies, it is concluded that intrinsic and extrinsic emotion and emotion regulatory systems are disrupted among children with ADHD.

Abstract Heart rate variability (HRV) is used in the assessment of cardiovascular health. However, often contradictory results have impeded the efficient use of HRV in clinical practice. HRV signals can contain artifacts leading to errors in the interpretation of HRV results. Various methods have been used for artifact editing, but there is relatively little information on how the actual editing can influence the HRV measures. The main aim of this thesis was to improve the reliability of HRV analysis by concentrating on the HRV signal preprocessing methods. The effects of three editing methods on the HRV of short (512 R-R) and long-term (24-hour) R-R interval data were studied with non-edited and edited data from healthy subjects (n=10) and patients with acute myocardial infarction (AMI) (n=10). The effects of ectopic beats on short (α1) and long-term (α2) fractal scaling exponents were studied by inserting artificial ectopic beats into the HRV signals of 20 healthy subjects and 20 AMI patients. The prognostic significance of edited and non-edited α1 and α2 was studied in random elderly (n=84) and post-AMI (n=84) populations. A new method to quantify respiratory sinus arrhythmia (RSA) was developed based on the HRV signals of 13 healthy subjects. A new measure, the RSA index, was defined to evaluate the risk to sudden cardiac death (SCD) in 1631 AMI patients. Lastly, a new algorithm was developed in order to edit heart rate (HR) turbulence occurring immediately after a ventricular premature beat (VPB). The effects of HR turbulence editing on the HRV analysis were studied in 267 AMI patients. Editing had distinct effects on the HRV analysis depending on the editing method and data type. Deletion editing was found to be unsuitable for the HRV spectrum analysis. There was no universal editing method for the time and frequency domain HRV analyses. Unedited ectopic beats increased the randomness of short-term R-R interval dynamics, especially in AMI patients. However, unedited α1 differed significantly between survivors and those who died during the follow-up. Ectopic beats do not necessarily need to be edited if fractal analysis is used in the risk evaluation. A depressed RSA index was found to be a strong predictor of SCD but a weak predictor of non-SCD in AMI patients. Editing of HR turbulence affected differently the various HRV measures. ULF and VLF components were most clearly influenced by HR turbulence removal. The amount of VBPs had an important impact on the results. When the VBPs/hour were >50, ULF and VLF were >30% lower after turbulence removal. The results of this thesis highlight the importance of editing the erroneous or irrelevant R-R interval oscillation in an HRV analysis. The careful choice of preprocessing method is essential if one wishes to obtain reliable HRV analyses for clinical purposes.

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