High-frequency Heart Rate Variability Research Articles

A Mindful Alternative to Screen Time: The Short-Term Effects of a Breath-Focused Mindfulness Exercise vs. Unstructured Smartphone Screen Time on Heart Rate Variability and Relaxation

Introduction: Many smartphone users spend hours daily on unstructured screen time leisure activities including social media, games, and videos. Given that many users express a desire to cut back on this habit, it is important to test the relative physiological and emotional benefits of alternative activities, such as mindfulness meditation, as daily practices for relaxation and restoration. Methods: This study tests the immediate effects of unstructured mobile phone screen time vs. practice of a brief mindful breathing meditation exercise on heart rate variability (HRV, a common measure of healthy resting physiological activity) and self-reported states of relaxation. Participants (171 female university students) were randomly assigned to 15 minutes of unstructured screen time (i.e., use phones in a manner consistent with typical daily use) or a mindfulness induction (i.e., a guided meditation recording focused on mindfulness of breathing). Results: Consistent with hypotheses, HRV showed greater increases relative to baseline in the mindfulness condition than the screen time condition (High-frequency HRV, partial η2 = .14, p < .001; Root Mean Square of Successive Differences, partial η2 = .053, p = .002). Subjective relaxation increased in both conditions (partial η2 = .47, p < .001); however, mindfulness produced greater increases in relaxation over time than unstructured screen time (partial η2 = .089, p < .001). Conclusions: Mindfulness was superior to unstructured screen time at increasing physiological and subjective markers of relaxation. Results suggest that repurposing smartphones to facilitate mindfulness practice though guided meditation apps may be a more effective method of promoting physiological and emotional well-being than more ubiquitous unstructured smartphone use.

The Interplay of Peer Victimization and Parasympathetic Nervous System Activity on Acute Inflammatory Stress Responses in Adolescence.

This study examined the extent to which adolescent peer victimization predicted acute inflammatory responses to stress, and whether both resting parasympathetic nervous system (PNS) activity and PNS stress reactivity moderated this association. 83 adolescents (Mage = 14.89, SDage = 0.52, 48% female) reported their history of peer victimization and were exposed to a standardized social stress task before and after which dried blood spot samples were collected to assay inflammatory markers. Inflammatory responses to the stress task were assessed with a latent inflammatory change factor using the cytokines interleukin-6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor-α (TNF-α). PNS functioning, indexed by high-frequency heart rate variability, was measured at rest and during the stressor. Contrary to hypotheses, analyses revealed no direct relation between peer victimization and acute inflammatory responses, and resting PNS activity did not moderate this association. However, peer victimization predicted stronger inflammatory responses among adolescents with weaker PNS reactivity to the stress task (b = 0.63, p = .02). This association was not observed among adolescents with stronger PNS reactivity, for whom a negative but non-significant trend was found. Weaker PNS reactivity may thus indicate victimized adolescents' vulnerability for acute inflammatory responses, whereas stronger PNS reactivity may indicate adolescents' resilience to a social stressor.

Abstract 14007: Decreased Perceived Social Support and Heart Rate Variability Are Associated With Hopelessness in Patients With Ischemic Heart Disease

Introduction: Hopelessness is present in up to 52% of patients with ischemic heart disease (IHD) and associated with a 3.4 times increased risk of death and adverse outcomes. Decreased perceived social support (PSS) has been associated with hopelessness in patients with IHD reporting moderate-severe hopelessness but has not been examined in a well-powered sample with varying levels of hopelessness. Increased PSS is associated with increased high frequency (HF) heart rate variability (HRV) in adults following a stressful event, but the relationship between HRV and hopelessness has not been examined in patients with IHD. Hypothesis: The purpose of this research was to test the hypotheses that 1) lower PSS would be associated with higher hopelessness, and 2) lower HF HRV would be associated with higher hopelessness. Methods: Utilizing a cross-sectional design, 178 participants were enrolled while hospitalized for an IHD event at one large hospital in the Midwestern United States. Data collection occurred two weeks after hospital discharge using the State-Trait Hopelessness Scale, ENRICHD Social Support Inventory, Patient Health Questionnaire-9, a demographic form, and a short-term HRV measurement at rest. Linear models were used to assess association between variables in unadjusted models and models adjusted for demographic and medical history. Results: Majority of participants were male (67%), married (67%), non-Hispanic white (92%), and underwent coronary artery bypass surgery (61%). There was a moderate inverse correlation between PSS and state ( r = -0.31, p < 0.001) and trait ( r = -0.28, p < 0.001) hopelessness in unadjusted models. The relationships remained significant in adjusted models and did not differ between groups comparing sex, type of IHD event, and marital status. There was a moderate inverse correlation between HF HRV and state hopelessness ( r = -0.24, p = 0.023). Results remained significant in adjusted models and did not differ between groups comparing sex, type of IHD event, and beta-blocker prescription. Conclusions: There were significant inverse associations between PSS and hopelessness and HF HRV and hopelessness. Persons with low PSS and/or HF HRV may be at greater risk for experiencing hopelessness following an IHD event.

Empathic stress in the mother-child dyad: Multimodal evidence for empathic stress in children observing their mothers during direct stress exposure.

Relationship closeness determines the propensity to spontaneously reproduce another's emotional and physiological stress response. We investigated whether psychosocial stress in mothers is causally linked to such empathic stress in children. Mothers (N = 76) completed either a standardized laboratory stressor or a stress-free control task, while their middle childhood-aged children (8-12 years old) were watching. Mother-child dyads simultaneously provided multiple cortisol, heart-rate, high-frequency heart-rate variability (HF-HRV), and subjective stress samples. We found that stress-group children had a greater propensity to show physiologically significant cortisol release, especially boys. Watching stressed mothers also triggered stronger subjective, state empathy, and HF-HRV stress responses, with the latter relying on elevated trait cognitive empathy ratings. Only in the stressed dyads, children's HF-HRV resonated with those of their mothers'. We conclude that young children, although only mildly stressed, spontaneously reproduce maternal stress. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Causal influence of brainstem response to transcutaneous vagus nerve stimulation on cardiovagal outflow

BackgroundThe autonomic response to transcutaneous auricular vagus nerve stimulation (taVNS) has been linked to the engagement of brainstem circuitry modulating autonomic outflow. However, the physiological mechanisms supporting such efferent vagal responses are not well understood, particularly in humans. HypothesisWe present a paradigm for estimating directional brain-heart interactions in response to taVNS. We propose that our approach is able to identify causal links between the activity of brainstem nuclei involved in autonomic control and cardiovagal outflow. MethodsWe adopt an approach based on a recent reformulation of Granger causality that includes permutation-based, nonparametric statistics. The method is applied to ultrahigh field (7T) functional magnetic resonance imaging (fMRI) data collected on healthy subjects during taVNS. ResultsOur framework identified taVNS-evoked functional brainstem responses with superior sensitivity compared to prior conventional approaches, confirming causal links between taVNS stimulation and fMRI response in the nucleus tractus solitarii (NTS). Furthermore, our causal approach elucidated potential mechanisms by which information is relayed between brainstem nuclei and cardiovagal, i.e., high-frequency heart rate variability, in response to taVNS. Our findings revealed that key brainstem nuclei, known from animal models to be involved in cardiovascular control, exert a causal influence on taVNS-induced cardiovagal outflow in humans. ConclusionOur causal approach allowed us to noninvasively evaluate directional interactions between fMRI BOLD signals from brainstem nuclei and cardiovagal outflow.

At the Head and Heart of Oxytocin’s Stress-Regulatory Neural and Cardiac Effects: A Chronic Administration RCT in Children with Autism

Introduction: Intranasal administration of oxytocin presents a promising new approach to reduce disability associated with an autism spectrum disorder diagnosis. Previous investigations have emphasized the amygdala as the neural foundation for oxytocin’s acute effects. However, to fully understand oxytocin’s therapeutic potential, it is crucial to gain insight into the neuroplastic changes in amygdala circuitry induced from chronic oxytocin administrations, particularly in pediatric populations. Objective: We aimed to examine the impact of a 4-week course of intranasal oxytocin on amygdala functional connectivity in children with autism, compared to placebo. Additionally, we investigated whether oxytocin improves cardiac autonomic arousal, as indexed by high-frequency heart rate variability. Methods: Fifty-seven children with autism aged 8–12 years (45 boys, 12 girls) participated in a double-blind, randomized pharmaco-neuroimaging trial involving twice-daily administrations of intranasal oxytocin or placebo. Resting-state fMRI scans and simultaneous, in-scanner heart rate recordings were obtained before, immediately after, and 4 weeks after the nasal spray administration period. Results: Significant reductions in intrinsic amygdala-orbitofrontal connectivity were observed, particularly at the 4-week follow-up session. These reductions were correlated with improved social symptoms and lower cardiac autonomic arousal. Further, oxytocin’s neural and cardiac autonomic effects were modulated by epigenetic modifications of the oxytocin receptor gene. The effects were more pronounced in children with reduced epigenetic methylation, signifying heightened expression of the oxytocin receptor. Conclusion: These findings underscore that a 4-week oxytocin administration course decreases amygdala connectivity and improves cardiac autonomic balance. Epigenetic modulators may explain inter-individual variation in responses to oxytocin.

Resting parasympathetic activity is associated with malodor-induced change in perceived foreignness of speakers.

To protect against infection, individuals have evolved context-dependent pathogen-avoidant strategies, including selective social behaviors aimed at avoiding foreign individuals who may possess greater risk of infection. Parasympathetic nervous system (PNS) activity is associated with social engagement and regulation of the classical immune system but has not been widely investigated in relation to changes in intergroup perception and the behavioral immune system. The current research investigated the relationship between parasympathetic activity and perceived foreignness of in and outgroup speakers during exposure to a pathogen-relevant odor (butyric acid). High-frequency heart rate variability was measured at rest and while participants rated foreignness of speakers with and without the odor present. Findings show that exposure to the odor was associated with higher foreignness perceptions of outgroup speakers and lower foreignness perceptions of ingroup speakers. This effect was especially evident among individuals with higher resting parasympathetic activity. These results suggest that the PNS may play a role in changes in social perceptions during a behavioral immune response.

Linear and non‑linear indices of vagal nerve in relation to sex and inflammation in patients with Covid‑19.

Hyperinflammation is one of the most important pathophysiological risk factors for poor prognosis in patients with coronavirus disease-2019 (Covid-19). Low vagal neuro-immune modulation can lead into this kind of immune dysregulation. The association between vagal activity, sex and inflammatory markers were investigated in patients with Covid-19. A total of 19 patients with Covid-19 were included in the present study. Vagus nerve activity was indexed by heart rate variability (HRV) derived from electrocardiogram at hospital admission. Linear HRV parameters included the root mean square of successive RR interval differences (RMSSD) and high-frequency HRV (HF-HRV), while non-linear parameters included 2 UV%. Immune/inflammatory parameters included C-reactive protein (CRP), interleukin-6 (IL-6), neutrophil/lymphocyte ratio (NLR), systemic inflammatory index (SII), and procalcitonin (PCT). It has been revealed that both linear HRV indices HF-HRV and RMSSD, are significantly negatively correlated with CRP and IL-6, independent of age. The non-linear index of 2 UV% is significantly negatively correlated with NLR and SII, which reflect subtle changes in the response of immunocompetent cells. Patients that received high-flow nasal oxygen therapy had significantly higher IL-6 and CRP levels and lower levels of HF-HRV and RMSSD. These patients also had a significantly longer length of stay in hospital (LOS) than patients receiving low-flow oxygen therapy. Men had higher plasma PCT levels and longer LOS in hospital than women, and PCT statistically explained (mediated) the association between sex and LOS. The present study showed different correlations of linear and non-linear vagal indexes of HRV and inflammatory markers in patients with Covid-19. Significant sex differences in certain inflammatory markers were also observed, which may very well verify previous findings of poor prognosis in men with Covid-19. HRV reflects a continuous interaction between the sympathetic and parasympathetic autonomic nervous systems, which are affected by mental or physical stress, and certain disease states. The increased sympathetic and decreased parasympathetic vagal tone contribute to a higher risk of diseases associated with inflammation, cardiovascular disease, cancer, pulmonary diseases and other pathologies, including infectious diseases such as Covid-19. The present study showed that higher RMSSD (a marker of vagal activity) in Covid-19 patients is associated with lower levels of inflammatory biomarkers, a lower need for treatment and is negatively correlated with intensive care unit admission, leading to a shorter hospital stay. These findings support the idea that activation of vagus nerve may help certain Covid-19 patients by reducing the cytokine storm and excessive inflammation.

Examining the Effects of Cellphone Separation on Cognitive Engagement and Behavioral Performance in A Stroop Task

Cellphone has become an integral part of people’s daily life. Anxiety may arise from cellphone separation. Although negative cognitive effects of cellphone separation were reported, the mechanism of how cellphone separation anxiety influences cognition. In the present study, we examined the effects of cellphone separation on state anxiety and physiological indicators of cognitive engagement, heart rate (HR), and high frequency heart rate variability (HF-HRV). Seventy-five college-aged participants were assigned into three groups (explicit separation, implicit separation, and control groups) and performed a Stroop task. Anxiety, HR and HF-HRV at baseline and during the task were measured. Additionally, trait anxiety, working memory capacity, and daily cellphone usage were measured as covariates. The dependent variables were submitted to repeated-measure mixed-model analysis of covariance (ANCOVA). Although there were no group effects on state anxiety and HF-HRV, the implicit cellphone separation group showed the highest level of HR response and the Stroop effect on RTs. The results suggest that the activation of the mental representation of a cellphone, which occurred in the implicit separation group, facilitates cognitive engagement and enlarge the effects of inhibition on the speed of Stroop responses.

Evidence of deviant parasympathetic response to social exclusion in women with borderline personality disorder

Stressful social situations like social exclusion are particularly challenging for patients with borderline personality disorder (BPD) and often lead to dysfunctional reactive behaviour of aggression and withdrawal. The autonomous signature of these core symptoms of BPD remains poorly understood. The present study investigated the parasympathetic response to social exclusion in women with BPD (n = 62) and healthy controls (HC; n = 87). In a between-subjects design, participants experienced objective social exclusion or overinclusion in the Cyberball task, a virtual ball-tossing game. Need threat scores served as individual measures of perceived exclusion and the resulting frustration of cognitive–emotional needs. Five-minute measurements of high-frequency heart rate variability (HF-HRV) at three time points (before, during, after Cyberball) indicated parasympathetic tone and regulation. We observed a trend towards lowered baseline HF-HRV in BPD vs. HC in line with previous findings. Interestingly, the parasympathetic response of patients with BPD to objective and perceived social exclusion fundamentally differed from HC: higher exclusion was associated with increased parasympathetic activation in HC, while this autonomic response was reversed and blunted in BPD. Our findings suggest that during social stress, the parasympathetic nervous system fails to display an adaptive regulation in patients with BPD, but not HC. Understanding the autonomous signature of the stress response in BPD allows the formulation of clinically relevant and biologically plausible interventions to counteract parasympathetic dysregulation in this clinical group.

Long-term stability of respiratory sinus arrhythmia among adults with and without a history of depression.

Respiratory sinus arrhythmia (RSA) is an index of parasympathetic nervous system activity reflecting respiratory influences on heart rate. This influence is typically measured as high frequency heart rate variability (HF-HRV) or root mean square of successive differences (RMSSD) of adjacent inter-beat intervals. Examining the long-term stability of its measurement is important as levels of resting RSA have been conceptualized as a marker of individual differences; in particular, of an individual's autonomic regulation and affect-related processes, including emotion regulation. At present, it is not known if resting RSA levels reflect stable differences over a long-term period (i.e., >1 year). Even less is known about how RSA stability differs as a function of depression history and whether it relates to depression risk trajectories. In the present study, we examined the 1.5-year test-retest reliability of resting RSA using the intraclass correlation coefficient (ICC) in 82 adults: n = 41 with a history of depression (ever-depressed); n = 41 controls with no depression history (never-depressed). HF-HRV was fairly stable in both groups (ever-depressed ICC = 0.55, never-depressed ICC = 0.54). RMSSD was also fairly stable in ever-depressed adults (ICC = 0.57) and never-depressed controls (ICC = 0.40). ICC values for both indices did not differ between groups per overlapping 95% confidence intervals. Therefore, RSA stability as assessed by both frequency (HF-HRV) and time domain (RMSSD) measures was not attenuated by a depression history. Implications and the need for future research are discussed.

Mental fatigue, cognitive performance and autonomic response following sustained mental activity in clinical burnout

ObjectiveTo investigate the effects of sustained mental activity on perceptions of mental fatigue, cognitive performance, and autonomic response in patients with clinical burnout as compared to a healthy control group. MethodsPatients with clinical burnout (n = 30) and healthy control participants (n = 30) completed a 3-hour test session, in which they were administered a set of cognitive tests before and after an effortful cognitive task with concurrent sound exposure. Perceptions of mental fatigue and task demands (mental effort and concentration difficulties) were assessed repeatedly over the course of the test session. Heart rate variability was recorded to index autonomic response. ResultsIn comparison with controls, perceived mental fatigue increased earlier in the session for the clinical burnout group and did not recover following a short rest period. Throughout the session, patients rated the tasks as more demanding and showed less improvement on measures of attention and processing speed, inhibition and working memory. While autonomic responses were initially comparable, there was a unique decrease in high-frequency heart rate variability in the clinical burnout group after extended testing and exposure. ConclusionPatients with clinical burnout are affected differently than healthy controls by sustained mental activity, as reflected by ratings of perceived mental fatigue, aspects of cognitive performance and autonomic response. Further investigation into the role of autonomic regulation in relation to cognitive symptoms in clinical burnout is warranted.

The psychophysiological reactivity to beaches vs. to green and urban environments: insights from a virtual reality experiment

Coastal environments effectively reduce perceived levels of stress. However, little is known about whether coastal environments influence physiological parameters of stress, whether these influences differ from those of urban and green environments, and whether these effects depend on the level of precedent stress. The current study exposed 164 participants (18-65y, 68% female) from the Flemish population to two 16-minute virtual reality exposures (i.e. beach vs. green or urban) via a randomized crossover design, during which the heart rate, high-frequency heart rate variability (HF-HRV), skin conductance responses (SCR), mean arterial pressure (MAP), breathing rate, and upper trapezius muscle tone were monitored. Self-reported measures of stress were also taken. General linear mixed models analyzed for each parameter whether the change over time differed per exposed environment and by the level of stress in the past week (from ‘low’ to ‘moderate’ levels), while controlling for study design and participant related covariates. Results show that beaches caused lower breathing rates than urban environments and lower SCR than green environments. The upper trapezius muscle tone showed complex patterns, and the heart rate, HF-HRV, and MAP did not react differently to the beach than to the urban and green environments. The individuals’ level of stress in the past week did not affect these differences much. Self-reported measures showed that, under moderate stress, beaches decreased the negative mood and perceived stress, whereas green environments did not and urban environments generally had more adverse effects on the negative mood, perceived stress, positive mood, and perceived quality for relaxation. This study demonstrates that beaches slow down breathing and reduce the sympathetic nervous system activity, and highlights the benefits of beaches for health and wellbeing. The results mark the importance of considering diverse physiological pathways of stress and the individuals’ precedent stress.

The autonomic and nociceptive response to acute experimental stress is impaired in people with knee osteoarthritis: A preliminary study

ObjectiveAlterations in autonomic function are evident in some chronic pain conditions but have not been thoroughly examined in people with osteoarthritis (OA). The study aimed to examine resting autonomic nervous system (ANS) function in people with knee OA, and the response of the autonomic and nociceptive systems to acute stress. MethodsA preliminary cross-sectional study was undertaken involving people with knee OA (n = 14), fibromyalgia (n = 13), and pain-free controls (n = 15). The sympathetic and parasympathetic components of the ANS were assessed through measures of pre-ejection period (PEP), skin conductance level (SCL), and high frequency heart rate variability (HF HRV). The nociceptive system was assessed through pain ratings associated with a tonic heat pain stimulus. In separate sessions, ANS and heat pain measures were assessed at rest and in response to nociceptive and mental arithmetic stressors. ResultsThe knee OA group showed reduced HF HRV at rest and reduced modulation in response to stress. Resting PEP and SCL were normal in the knee OA group but PEP modulation was impaired in both chronic pain groups during nociceptive stress. The expected reduction in tonic heat pain ratings in response to stress was lacking in the knee OA and FM groups. ConclusionPreliminary evidence shows impaired parasympathetic nervous system function at rest and in response to nociceptive and mental stress in people with knee OA, with some evidence of altered sympathetic nervous system function. Impaired ANS function could contribute to ongoing pain experienced, and interventions that target ANS function could be beneficial.

Effect of acupuncture-moxibustion stimulation of combined "Biao-Ben" acupoints on autonomic nervous activity and related factors in rats with irritable bowel syndrome diarrhea

To observe the effect of acupuncture and moxibustion of the combined "Biao-Ben" acupoints on autonomic nervous function and related factors in rats with irritable bowel syndrome diarrhea (IBS-D). Female SD rats were randomly divided into normal control, IBS-D model, "Biao-Ben" acupoint combination, and conventional acupoint combination groups, with 10 rats in each group. The IBS-D model was established by repeated chronic stress stimulation (water or food deprivation, painful tail pinching, exposure to a 43 ℃ environment, forced swimming in 4 ℃ water, day-night inversion and horizontal vibration) for 28 d, and followed by acute restraint stress (wrapping of shoulders, forelimbs and trunk) for 1 h and gavage of senna fluid, once daily for 28 d. For rats of the "Biao-Ben" acupoint combination group, acupuncture and moxibustion were applied to "Guanyuan" (CV4), bilateral "Zusanli" (ST36), and "Neiguan" (PC6), and for rats of the conventional acupoint combination group, acupuncture and moxibustion were applied to bilateral ST36, "Tianshu"(ST25), and "Shangjuxu"(ST37). Both acupuncture and suspension moxibustion treatment were conduced for 15 min, once daily for 21 days. The fecal water content was calculated, and the spontaneous activity behaviors (total distance of crossing and the number of squares crossed in 5 min) were evaluated by open-field tests. The abdominal withdrawal reflex (AWR) was detected. H.E. staining was used to observe the histopathological changes of colon tissue. The domains of heart rate variability (HRV) including low frequency (LF), high frequency (HF), and LF/HF were analyzed using an electrophysiological recorder. The contents of calcitonin gene-related peptide (CGRP) in serum and noradrenaline (NE) in plasma were detected using ELISA. The expression level and immunoactivity of 5-hydroxytryptamine (5-HT) in colon tissues were detected by Western blot and immunofluorescence histochemistry, separately. Compared with the normal group, the model group had a striking increase in fecal water content, AWR scores at 20, 40, 60, and 80 mm Hg, NE and CGRP contents, LF, LF/HF, and 5-HT protein expression and immunoactivity (P<0.01), and an obvious decrease in the total distance of crossing, the number of squares crossed, and HF of HRV (P<0.01). In comparison with the model group, the fecal water content, AWR scores at 20, 40, 60, and 80 mm Hg, NE and CGRP contents, LF, LF/HF, and 5-HT protein expression and immunoactivity were significantly decreased (P<0.01,P<0.05), while the total distance of cros-sing, number of squares crossed, HF of HRV were considerably increased (P<0.01, P<0.05) in both "Biao-Ben" acupoint combination and conventional acupoint combination groups. The effects of the "Biao-Ben" acupoint combination were apparently superior to those of conventional acupoint combination in down-regulating the fecal water content, AWR score at 20, 40, 60 and 80 mm Hg, NE and CGRP contents, LF, LF/HF, and 5-HT expression and immunoactivity, and in increasing the number of squares crossed, and HF of HRV (P<0.01, P<0.05). HE staining showed no pathological changes in colonic mucosa in all groups. Acupuncture and moxibustion stimulation of combined "Biao-Ben" acupoints can effectively improve the symptoms (spontaneous activities, visceral hypersensitivity) of IBS-D model rats, which may be related to its functions in regulating autonomic nervous activities, and down-regulating blood NE and CGRP contents and colonic 5-HT protein expression and immunoactivity, and the effects of "Biao-Ben" acupoint combination are superior to those of conventional acupoint combination.

PTSD and depression severity are associated with cardiovascular disease symptoms in trauma-exposed women

ABSTRACT Background: Posttraumatic stress disorder (PTSD) and depression are associated with increased risk for cardiovascular disease (CVD), which is the leading cause of death and disability worldwide. Epidemiological studies have revealed these illnesses to be highly comorbid, particularly among women. In the current study, we explored associations between indices of cardiovascular health, PTSD, and depression among a sample of trauma-exposed individuals assigned female at birth. Methods: Participants were N = 49 individuals without CVD who reported lifetime Criterion A trauma exposure. Blood pressure (BP), heart rate (HR), and high-frequency heart rate variability (HF-HRV) were collected during a 5-minute resting period. Symptoms of CVD (e.g. extremity pain and swelling, shortness of breath), PTSD, and depression were assessed, along with an exploratory measure of anhedonia. Results: Trauma exposure was positively correlated with systolic BP (r = .32, p = .029) and diastolic BP (r = .30, p = .040). The number of reported CVD symptoms was positively correlated with symptoms of PTSD (r = .41, p = .004), depression (r = .40, p = .005) and anhedonia (r = .38, p = .007). CVD symptoms were also significantly associated with PTSD (β = .41, t = 2.43, p = .023), depression (β = .40, t = 2.76, p = .009), and anhedonia (β = .38, t = 2.51, p = .017) after controlling for age and trauma exposure. These associations were not moderated by HF-HRV in our sample. Conclusions: Our results support the association between PTSD and depressive symptoms and worse cardiovascular functioning among an often-overlooked population that is particularly vulnerable to these illnesses. Future studies should investigate residual impacts of PTSD and depression treatment on CVD risk among trauma-exposed individuals, particularly women.

Caregiver and Child Distress as Predictors of Dyadic Physiological Attunement During Vaccination.

Previous research discerned three groups of caregiver-toddler dyads that differed in their physiological co-regulatory patterns, also known as physiological attunement, during routine vaccinations in the second year of life. One group of dyads (80% of sample) displayed an attuned regulatory pattern and two groups of dyads (20% of sample) showed maladaptive attunement patterns (i.e., a lack of attunement or misattunement). The objective of the current study was to examine how well pain-related distress of children and caregivers during vaccination predicted these patterns. Caregiver-toddler dyads (N = 189) were part of a longitudinal cohort observed at either 12-, 18-, or 24-month vaccination appointments. Caregiver self-report of worry was assessed before and after the needle and child behavioural pain-related distress was also measured during the vaccination appointment. Logistic regression was used to determine how well these variables predicted caregiver-child physiological attunement patterns, as indexed by high-frequency heart rate variability. Higher behavioural pain-related distress at various timepoints after the needle were associated with membership in the dyad groups that showed misattunement or lack of attunement. Further, caregivers with higher pre-needle worry and lower post-needle worry had a greater likelihood of belonging to groups that showed a maladaptive attunement pattern. Findings suggest that caregivers who experience distress associated with their toddlers' vaccination experience more difficulty co-regulating with their child during vaccination, and these children are at risk of experiencing higher levels of pain-related distress. This research highlights the need to help caregivers support their children's regulation during vaccination.

Effects of fear of cancer recurrence on subjective physical and mental health in breast cancer patients: The intermediary role of heart rate variability.

Fear of cancer recurrence (FCR) and psychological distress are common psychological problems in breast cancer (BC) patients and ultimately affecting their health-related quality of life (HRQoL). Heart rate variability (HRV) can reflect the activity of the parasympathetic nervous system. However, the pathways through which HRV influences between FCR and HRQoL are unclear. This study preliminarily explored the intermediary role of HRV in FCR and HRQoL in BC patients. A total of 101 BC patients participated in this study. HRV parameters were measured by a 5-min dynamic electrocardiogram. FCR, psychological distress and HRQoL were evaluated by the Fear of disease progression simplified scale (FOP-Q-SF), Distress thermometer and SF-36 concise health survey. The intermediary effect model was established to test the intermediary effect of high frequency-HRV (HF-HRV) on FCR and HRQoL. FCR and psychological distress were negatively correlated with HRV in the time domain, negatively correlated with HF-HRV in the frequency domain, and positively correlated with low frequency/high frequency (LF/HF). HF-HRV had a partial mediating effect on the FCR and physical health and mental health, with effects of 30.23% and 9.53%, respectively. FCR and psychological distress are correlated with HRV parameters in the time domain and the frequency domain, and we preliminarily believe that parasympathetic nerves play an important intermediary role between FCR and subjective physical and mental health. This may provide intervention information for improving the HRQoL of BC patients.

Heart rate variability during social interaction: Effects of valence and emotion regulation

Conceptual models of psychosocial influences on short-term changes (i.e., reactivity) in vagally-mediated heart rate variability (vmHRV) emphasize self-regulatory effort and social threat versus comfort. However, these two general perspectives have been tested separately in nearly all cases, limiting conclusions about the relative importance or possible interactive effects of effortful self-regulation and social stress. The present study compared effects of effort to regulate emotional expression and social stress versus safety on vmHRV reactivity during an interpersonal interaction, in a 2 (self-regulate emotion vs. express emotion freely) × 3 (positive vs. neutral vs. negative interaction valence) × 2 (male vs. female) between-subjects randomized factorial design. A sample of 180 undergraduates (90 women; 69 % White) discussed a current events topic (i.e., human-caused climate change) with a prerecorded partner, presented as a live interaction over a computer. Self-reports of affective responses, self-regulation effort, and appraisals of the partner's behavior, as well as observer ratings of participants' behavior during the interaction, supported the effectiveness of self-regulation and interaction valence manipulations, although the former manipulation may have been somewhat weaker than the latter. Primary analyses of high-frequency heart rate variability (HF-HRV) and root mean square of successive differences (RMSSD) in heart beat intervals recorded at baseline and during the interaction revealed larger decreases in vmHRV during negative than neutral or positive interactions, but no effects of self-regulation instructions. Overall, results indicated more robust effects of social stress on vmHRV reactivity, relative to effects of self-regulatory effort.

The impact of peer-delivered cognitive behavioral therapy for postpartum depression on infant emotion regulation

BackgroundPostpartum depression (PPD) affects up to one in five and negatively affects mothers, birthing parents, and their infants. The impact of PPD exposure on infant emotion regulation (ER) may be particularly harmful given its associations with later psychiatric problems. It remains unclear if treating maternal PPD can improve infant ER. ObjectiveTo examine the impact of a nine-week peer-delivered group cognitive behavioral therapy (CBT) intervention on infant ER assessed across physiological and behavioral levels. MethodsSeventy-three mother-infant dyads were enrolled in a randomized controlled trial from 2018 to 2020. Mothers/birthing parents were randomized to the experimental group or waitlist control group. Measures of infant ER were collected at baseline (T1) and nine weeks later (T2). Infant ER was assessed using two physiological measures (frontal alpha asymmetry (FAA) and High Frequency-Heart Rate Variability (HF-HRV)), and parental-report of infant temperament. ResultsExperimental group infants displayed more adaptive changes in both physiological markers of infant ER from T1 to T2 (FAA (F(1,56) = 4.16, p = .046) and HF-HRV (F(1,28.1) = 5.57, p = .03)) than those in the waitlist control group. Despite improvements in maternal PPD, no differences were noted in infant temperament from T1 to T2. LimitationsA limited sample size, potential lack of generalizability of our results to other populations, and an absence of long-term data collection. ConclusionsA scalable intervention designed for those with PPD may be capable of adaptively improving infant ER. Replication in larger samples is needed to determine if maternal treatment can help disrupt the transmission of psychiatric risk from mothers/birthing parents to their infants.