High ventilation breathwork practices: An overview of their effects, mechanisms, and considerations for clinical applications.

High Ventilation Breathwork (HVB) refers to practices employing specific volitional manipulation of breathing, with a long history of use to relieve various forms of psychological distress. This paper seeks to offer a consolidative insight into potential clinical application of HVB as a treatment of psychiatric disorders. We thus review the characteristic phenomenological and neurophysiological effects of these practices to inform their mechanism of therapeutic action, safety profiles and future clinical applications. Clinical observations and data from neurophysiological studies indicate that HVB is associated with extraordinary changes in subjective experience, as well as with profound effects on central and autonomic nervous systems functions through modulation of neurometabolic parameters and interoceptive sensory systems. This growing evidence base may guide how the phenomenological effects of HVB can be understood, and potentially harnessed in the context of such volitional perturbation of psychophysiological state. Reports of putative beneficial effects for trauma-related, affective, and somatic disorders invite further research to obtain detailed mechanistic knowledge, and rigorous clinical testing of these potential therapeutic uses.

Analysis of Meditation vs. Sensory Engaged Brain States Using Shannon Entropy and Pearson's First Skewness Coefficient Extracted from EEG Data.

It has been proposed that meditative states show different brain dynamics than other more engaged states. It is known that when people sit with closed eyes instead of open eyes, they have different brain dynamics, which may be associated with a combination of deprived sensory input and more relaxed inner psychophysiological and cognitive states. Here, we study such states based on a previously established experimental methodology, with the aid of an electro-encephalography (EEG) array with 128 electrodes. We derived the Shannon Entropy (H) and Pearson's 1st Skewness Coefficient (PSk) from the power spectrum for the modalities of meditation and video watching, including 20 participants, 11 meditators and 9 non-meditators. The discriminating performance of the indices H and PSk was evaluated using Student's t-test. The results demonstrate a statistically significant difference between the mean H and PSk values during meditation and video watch modes. We show that the H index is useful to discriminate between Meditator and Non-Meditator participants during meditation over both the prefrontal and occipital areas, while the PSk index is useful to discriminate Meditators from Non-Meditators based on the prefrontal areas for both meditation and video modes. Moreover, we observe episodes of anti-correlation between the prefrontal and occipital areas during meditation, while there is no evidence for such anticorrelation periods during video watching. We outline directions of future studies incorporating further statistical indices for the characterization of brain states.

'It stretches your body but makes you feel good too': A qualitative study exploring young people's perceptions and experiences of yoga.

Whilst research suggests that yoga can positively impact physical and psychological wellbeing, understanding of youth's experiences is limited with no non-clinical studies in the UK. Ten focus groups explored perceptions and experiences of yoga among 35 youth (10-18 years). Inductive thematic analysis revealed that yoga was viewed as a holistic mind-body practice cultivating greater awareness and enhanced physical performance. Youth described yoga as providing tools that developed confidence, stress-management and emotional self-regulation. Social and relational impacts of yoga were highly valued. Despite the perceived biopsychosocial benefits of yoga, gendered and media representations of yoga may serve as a barrier to uptake.

Quick coherence technique facilitating commercial pilots' psychophysiological resilience to the impact of COVID-19.

This study investigates the effect of quick coherence technique (QCT) on commercial pilots' resilience to the unprecedented impact of a pandemic. Eighteen commercial pilots voluntarily participated in a 2-day training course on QCT followed by 2 months of self-regulated QCT practicing during controlled rest in the flight deck and day-to day life. There are subjective and objective assessments to evaluate the effects of QCT on commercial pilots' psychophysiological resilience. Results demonstrated that QCT training can significantly increase pilots' psychophysiological resilience thereby improving their mental/physical health, cognitive functions, emotional stability and wellness on both subjective (PSS & AWSA) and objective measures (coherence scores). Moreover, pilots who continued practicing self-regulated QCT gained the maximum benefits. Current research has identified great potential to enhance pilots' mental/physical health via QCT training. Operators can develop peer support programs for pilots to increase resilience and maintain mental and physical health using the QCT technique. Practitioner summary: QCT breathing has been proven to increase commercial pilots' resilience by moderating psychophysiological coherence, strengthening mental/physical capacity and sustaining positive emotions to deal with the challenges both on the flight deck and in everyday life.HIGHLIGHTSPilots have suffered from the impact of the Covid-19 pandemic across many factors including social, economic, mental, physical, emotional, and operational issuesBiofeedback training can increase commercial pilots' resilience by moderating psychophysiological coherence, strengthening mental and physical capacitySelf-regulated practicing QCT to form a habitual behaviour is required to sustain the maximum benefits either in the flight or day-to-day lifeQCT is an effective intervention for aviation authorities and airline operators to develop peer support programs to increase pilots' fatigue resilience.

Notas para decolonizar os estudos transpessoais no brasil: contribuições do pluriperspectivismo participativo / Notes for decolonizing transpersonal studies in brazil: contributions of participatory pluriperspectivism / Apuntes para la decolonización de los estudios transpersonales en brasil: aportes del pluriperspectivismo participativo

O campo dos estudos transpessoais tem avançado em diversas áreas no Brasil. Comemorou seus 40 anos com uma inserção ativa nas Instituições de Ensino Superior (IES) e uma ampliação de núcleos formativos e apoiadores de ensino, pesquisa e ações sociais, além de diálogos com o Sistema de Conselhos de Psicologia. Desafios são apresentados a partir do levantamento de uma série de questões importantes e ignoradas dentro da Psicologia Transpessoal no Brasil. Apresentamos o pluriperspectivismo participativo como possibilidade de decolonizar as matrizes eurocêntricas e estadunidenses, que dão suporte ao pensamento transpessoal brasileiro, buscando honrar nossas raízes históricas e incluir outras epistemologias e ontologias, que dão continuidade à crítica à lógica cartesiana moderna. Indicamos uma breve agenda de notas temáticas que carecem de um processo decolonizador no campo transpessoal: a) crítica às perspectivas de um pensamento hegemônico, em termos globais por meio da dominação Norte-Sul ou no campo das relações sociais; b) revisão das formas de "centrocentrismo"; c) questionamento da noção de universalismo das ciências e da ética; d) aprofundamento da análise crítica da supremacia restritiva da racionalidade formal técnico-científica em relação às formas de subjetividade, de vivências holísticas e integradoras e de valorização do corpo; e) revisão da noção de sujeito moderno desprovida da cocriação do humano com a comunidade, a história, a natureza e o cosmos.(AU)

The field of transpersonal studies has advanced in several areas in Brazil. It celebrated its 40th anniversary with an active insertion in Higher Education Institutions (HEI) and an expansion of training centers and supporters of teaching, research, and social actions, in addition to dialogues with the System of Councils of Psychology. Challenges are presented based on a survey of a series of important and ignored issues within Transpersonal Psychology in Brazil. We present participatory pluriperspectivism as a possibility to decolonize the Eurocentric and North American matrices that support Brazilian transpersonal thought, seeking to honor our historical roots and include other epistemologies and ontologies, which continue the critique of modern Cartesian logic. We indicate a brief agenda of thematic notes that lack a decolonizing process in the transpersonal field: a) criticism of the perspectives of a hegemonic thought, whether in global terms via North-South domination or in the field of social relations; b) review of the forms of "centrocentrism"; c) questioning of the notion of universalism of science and ethics; d) deepening of the critical analysis of the restrictive supremacy of the technical-scientific formal rationality in relation to the forms of subjectivity, of holistic and integrative experiences, and of valuing the body; e) review of the notion of the modern subject devoid of the co-creation of the human with the community, the history, the nature, and the cosmos.(AU)

El campo de los estudios transpersonales ha avanzado en varias áreas de Brasil. Se celebró su 40.º aniversario con una inserción activa en Instituciones de Educación Superior (IES) y una ampliación de los centros de formación y promotores de la docencia, la investigación y la acción social, además de diálogos con el Sistema de Consejos de Psicología. Los desafíos se presentan a partir de una encuesta de una serie de temas importantes e ignorados dentro de la Psicología Transpersonal en Brasil. Presentamos el pluriperspectivismo participativo como una posibilidad para decolonizar las matrices eurocéntrica y americana, que sustentan el pensamiento transpersonal brasileño, buscando honrar nuestras raíces históricas e incluir otras epistemologías y ontologías que continúan la crítica de la lógica cartesiana moderna. Indicamos una breve agenda de apuntes temáticos que carecen de un proceso decolonizador en el campo transpersonal: a) crítica de las perspectivas de un pensamiento hegemónico, ya sea en términos globales a través del dominio Norte-Sur o en el campo de las relaciones sociales; b) revisión de las formas de "centrocentrismo"; c) cuestionamiento de la noción de universalismo de la ciencia y la ética; d) profundización del análisis crítico de la supremacía restrictiva de la racionalidad formal técnico-científica en relación a las formas de subjetividad, de experiencias holísticas e integradoras y de valoración del cuerpo; e) revisión de la noción de sujeto moderno desprovisto de la cocreación de lo humano con la comunidad, la historia, la naturaleza y el cosmos.(AU)

Analysis of Progressive Muscle Relaxation on Psychophysiological Variables in Basketball Athletes.

The purpose of this study was to evaluate the effects of a progressive muscle relaxation program on psychological (stress levels, anxiety, and mood states) and physiological (blood pressure and heart rate) variables in basketball athletes. Fifty-nine basketball players, aged 14 to 19 years, and members of Bauru Basket team, were recruited for this study and grouped into control group (CG, n = 30) and intervention group (IG, n = 29). The participants were evaluated, before and after the intervention, by the following means: Competitive State Anxiety Inventory-2 (CSAI-2), to measure the pre-competitive anxiety state, i.e., how anxious each athlete felt just before the competition; Brunel Mood Scale (BRUMS), an instrument for early detection of overtraining syndrome; Recovery-Stress Questionnaire for Athletes (RESTQ-Sport), to identify the extent to which each athlete was physically or mentally stressed and the athlete's current capability for recovery; Athlete Burnout Questionnaire (ABQ), specifically developed for athletes. The IG athletes participated in 12 progressive muscle relaxation sessions, a practice for tensing or tightening a specific muscle until an ideal state of relaxation is reached. Each participant had blood pressure and heart rate measured before and after every session. The CG athletes were evaluated similarly to those in the IG but without relaxation. The results showed statistically significant differences in cognitive anxiety (p = 0.039) and specific stress (p = 0.016) between CG and IG before the intervention; in addition, a significant heart rate decrease (p < 0.01) between IG and CG was noted.

Psychophysiological effects of slow-paced breathing at six cycles per minute with or without heart rate variability biofeedback.

Heart rate variability (HRV) biofeedback, referring to slow-paced breathing (SPB) realized while visualizing a heart rate, HRV, and/or respiratory signal, has become an adjunct treatment for a large range of psychologic and medical conditions. However, the underlying mechanisms explaining the effectiveness of HRV biofeedback still need to be uncovered. This study aimed to disentangle the specific effects of HRV biofeedback from the effects of SPB realized alone. In total, 112 participants took part in the study. The parameters assessed were emotional (valence, arousal, and control) and perceived stress intensity as self-report variables and the root mean square of the successive differences (RMSSD) as a physiologic variable. A main effect of condition was found for emotional valence only, valence being more positive overall in the SPB-HRVB condition. A main effect of time was observed for all dependent variables. However, no main effects for the condition or time x condition interaction effects were observed. Results showed that for PRE and POST comparisons (referring, respectively, to before and after SPB), both SPB-HRVB and SPB-NoHRVB conditions resulted in a more negative emotional valence, lower emotional arousal, higher emotional control, and higher RMSSD. Future research might investigate psychophysiological differences between SPB-HRVB and SPB-NoHRVB across different time periods (e.g., long-term interventions), and in response to diverse psychophysiological stressors.

Impact of hypnosis on psychophysiological measures: A scoping literature review.

Exploring psychophysiological changes during hypnosis can help to better understand the nature and extent of the hypnotic phenomenon by characterizing its influence on the autonomic nervous system (ANS), in addition to its central brain effects. Hypnosis is thought to induce a relaxation response, yet studies using objective psychophysiological measures alongside hypnosis protocols show various results. We review this literature and clarify the effects of hypnosis on psychophysiological indices of ANS activity and more specifically of the stress/relaxation response, such as heart rate variability and electrodermal activity. Studies reporting psychophysical measures during hypnosis were identified by a series of Pubmed searches. Data was extracted with an interest for the influence of hypnotizability and effects of specific suggestions or tasks on the findings. We found 49 studies comprising 1315 participants, 45 concerning healthy volunteers and only 4 on patients. Sixteen compared high vs. low hypnotizable people; 30 measured heart rate, 18 measured heart rate variability, 25 electrodermal activity, and 23 respiratory signals as well as other physiological parameters. Globally, results converge to show reductions in sympathetic responses and/or increases in parasympathetic tone under hypnosis. Several methodological limitations are underscored, such as older studies (N = 16) using manual analyses, small sample sizes (<30, N = 31), as well as uncontrolled multiple comparisons. Nevertheless, we confirm that hypnosis leads to a physiological relaxation response and highlight promising avenues for this research. Suggestions are made for guiding future work in this field.

Different contra-sound effects between noise and music stimuli seen in N1m and psychophysical responses.

Auditory-evoked responses can be affected by the sound presented to the contralateral ear. The different contra-sound effects between noise and music stimuli on N1m responses of auditory-evoked fields and those on psychophysical response were examined in 12 and 15 subjects, respectively. In the magnetoencephalographic study, the stimulus to elicit the N1m response was a tone burst of 500 ms duration at a frequency of 250 Hz, presented at a level of 70 dB, and white noise filtered with high-pass filter at 2000 Hz and music stimuli filtered with high-pass filter at 2000 Hz were used as contralateral noise. The contralateral stimuli (noise or music) were presented in 10 dB steps from 80 dB to 30 dB. Subjects were instructed to focus their attention to the left ear and to press the response button each time they heard burst stimuli presented to the left ear. In the psychophysical study, the effects of contralateral sound presentation on the response time for detection of the probe sound of a 250 Hz tone burst presented at a level of 70 dB were examined for the same contra-noise and contra-music used in the magnetoencephalographic study. The amplitude reduction and latency delay of N1m caused by contra-music stimuli were significantly larger than those by contra-noise stimuli in bilateral hemisphere, even for low level of contra-music near the psychophysical threshold. Moreover, this larger suppressive effect induced by contra-music effects was also observed psychophysically; i.e., the change in response time for detection of the probe sound was significantly longer by adding contralateral music stimuli than by adding contra-noise stimuli. Regarding differences in effect between contra-music and contra-noise, differences in the degree of saliency may be responsible for their different abilities to disturb auditory attention to the probe sound, but further investigation is required to confirm this hypothesis.

Defensive freezing and its relation to approach-avoidance decision-making under threat.

Successful responding to acutely threatening situations requires adequate approach-avoidance decisions. However, it is unclear how threat-induced states-like freezing-related bradycardia-impact the weighing of the potential outcomes of such value-based decisions. Insight into the underlying computations is essential, not only to improve our models of decision-making but also to improve interventions for maladaptive decisions, for instance in anxiety patients and first-responders who frequently have to make decisions under acute threat. Forty-two participants made passive and active approach-avoidance decisions under threat-of-shock when confronted with mixed outcome-prospects (i.e., varying money and shock amounts). Choice behavior was best predicted by a model including individual action-tendencies and bradycardia, beyond the subjective value of the outcome. Moreover, threat-related bradycardia (high-vs-low threat) interacted with subjective value, depending on the action-context (passive-vs-active). Specifically, in action-contexts incongruent with participants' intrinsic action-tendencies, stronger bradycardia related to diminished effects of subjective value on choice across participants. These findings illustrate the relevance of testing approach-avoidance decisions in relatively ecologically valid conditions of acute and primarily reinforced threat. These mechanistic insights into approach-avoidance conflict-resolution may inspire biofeedback-related techniques to optimize decision-making under threat. Critically, the findings demonstrate the relevance of incorporating internal psychophysiological states and external action-contexts into models of approach-avoidance decision-making.

Managing the experience of breathlessness with Tai Chi: A qualitative analysis from a randomized controlled trial in COPD.

PURPOSE: Chronic obstructive pulmonary disease (COPD) is associated with dyspnea, decreased physical activity, and reduced quality-of-life. While pulmonary rehabilitation is helpful, maintenance of physical activity afterwards is problematic. We sought to explore qualitatively the multi-dimensional, biopsychosocial experience of patients with COPD who participated in Tai Chi (TC) vs. group walking to facilitate physical activity after pulmonary rehabilitation). METHODS: We analyzed semi-structured qualitative exit interviews (N = 81) from a randomized controlled trial comparing 6-months TC with a time-matched group walking intervention and usual care control (UC). Transcripts were reviewed by at least 2 independent reviewers utilizing a social constructivist framework and theoretical sampling approach. An in-depth analysis of an exemplar subset was performed to thematic saturation and captured emergent themes within and between groups. RESULTS: Focused analysis was conducted on 54 transcripts (N = 21 TC, N = 16 Walking, N = 17 UC). Participants were characterized by mean age 68.5 (±8.3) years, GOLD Stage = 3.0 (IQR 2.0-3.0), baseline FEV1 percent predicted 48.8% (±16.4), and 48.2% female. We identified predominant themes of breathlessness, and associated fear and embarrassment that limited physical activity across all groups. In both TC and walking, participants reported improvements in energy and endurance. Those in TC additionally shared improvements in breathing, mobility, and capacity for daily activities facilitated by body and breath awareness, emotional control and regulation of breathing, and an adaptive reframing of breathlessness. CONCLUSION: TC promoted physical and mental wellbeing by diminishing fear and embarrassment associated with breathlessness. Results highlight the multimodal characteristics of TC that may facilitate continued physical activity and improvement in quality of life.

Benefits in Alzheimer's Disease of Sensory and Multisensory Stimulation.

Alzheimer's disease (AD) is a serious neurodegenerative disease, which seriously affects the behavior, cognition, and memory of patients. Studies have shown that sensory stimulation can effectively improve the cognition and memory of AD patients, and its role in brain plasticity and neural regulation is initially revealed. This paper aims to review the effect of various sensory stimulation and multisensory stimulation for AD, and to explain the possible mechanism, so as to provide some new ideas for further research in this field. We searched the Web of Science and PubMed databases (from 2000 to October 27, 2020) for literature on the treatment of AD with sensory and multisensory stimulation, including music therapy, aromatherapy, rhythmic (e.g., visual or acoustic) stimulation, light therapy, multisensory stimulation, and virtual reality assisted therapy, then conducted a systematic analysis. Results show these sensory and multisensory stimulations can effectively ameliorate the pathology of AD, arouse memory, and improve cognition and behaviors. What's more, it can cause brain nerve oscillation, enhance brain plasticity, and regulate regional cerebral blood flow. Sensory and multisensory stimulation are very promising therapeutic methods, and they play an important role in the improvement and treatment of AD, but their potential mechanism and stimulation parameters need to be explored and improved.

Towards a multi-brain framework for hypnosis: a review of quantitative methods.

Most real-world applications of hypnosis involve a pair of actors: a hypnotist and a subject. Accordingly, most current models of hypnosis acknowledge the relevance of social factors in the development of the hypnotic response. Yet, psychophysiological research on hypnosis has been mostly restricted to techniques that are studying one individual, neglecting the complexity of hypnosis as a social phenomenon. In this paper, we review evidence suggesting that a multi-brain approach to studying the psychophysiology of hypnosis could lead to a breakthrough in our understanding of the neural correlates of hypnosis. In particular, we aim to highlight how this approach which relies on the information conveyed by complex verbal stimuli can be utilized to deal with the multifaceted nature of hypnosis. Furthermore, we present analytical approaches to assessing brain-to-brain coupling developed in the field of social cognitive neuroscience in the past decade, to aid the design of similar multi-brain studies in hypnosis research.

Diet and Mental Health.

There is accumulating evidence from observational and intervention studies in nutritional psychiatry regarding the importance of diet for mental health outcomes across the lifespan. Here, we synthesise this evidence, including findings from large meta-analyses showing cross-sectional and prospective associations between diet quality and mental health, even following adjustment for relevant confounding factors. Potential mechanistic pathways underpinning these associations include those of the gut-brain axis, demonstrated mostly in animal models. Dietary fibre is an important component of healthy diet and may be relevant for common mental disorders, with some studies showing a dose-dependent relationship between fibre intake and risk of depression. The potential contribution of nutraceuticals is also discussed, such as omega-3 fatty acids, vitamins, minerals, and psychobiotics. We consider the relevance of special diets such as the ketogenic diet and food sensitivities in the management of severe mental illness (e.g., anorexia nervosa) and brain disease (e.g., Alzheimer's disease). Given the relatively early nature of research in nutritional psychiatry, there remain a number of challenges to its translation into clinical practice. These span individual, clinical, and societal domains. We conclude with a discussion of micro- and macroeconomic factors which may be considered in the successful application of nutritional psychiatry research to improve public health.

ANTROPOGÊNESE DAS DOENÇAS ORGÂNICAS: UMA NOVA VISÃO EM PSICOSSOMÁTICA / ANTHROPOGENESIS OF ORGANIC DISEASES: A NEW VISION IN PSYCHOSOMATICS / ANTROPOGÉNESIS DE LAS ENFERMEDADES ORGÁNICAS: UNA NUEVA VISIÓN EN PSICOSOMÁTICA

O debate sobre a relação mente-corpo, um dos maiores problemas filosóficos existentes, perpassa outras áreas do conhecimento. Do ponto de vista da prática psicoterápica, o atendimento a pacientes com doenças orgânicas contribuiu para o surgimento do campo da psicossomática. Inicialmente, esse artigo visa apresentar os principais conceitos das Escolas de Psicossomática de Chicago e Paris, as mais relevantes no Ocidente. Como resposta a essas visões, consideradas reducionistas e exageradamente intrapsíquicas, serão apresentados estudos sobre o vínculo humano. A partir de tal descrição emergirá uma proposta de compreensão teórica do fenômeno psicossomático tomando como matriz as considerações conceituais de Danilo Perestrello e Abram Eksterman, psicanalistas brasileiros, cujo ponto nodal é o entendimento da doença somática em sua dimensão antropogênica. As ideias contidas nesse pensamento serão a base para a noção de adoecimento somático enquanto resposta às dificuldades presentes no campo relacional.

The debate about the mind-body relationship, one of the greatest philosophical problems, permeates other areas of knowledge. From the point of view of psychotherapeutic practice, care for patients with organic diseases contributed to the emergence of the psychosomatic field. Initially, this article aims to present the main concepts of Chicago and Paris Psychosomatic Schools, the most relevant in the West. In response to these views, considered reductionist and exaggeratedly intrapsychic, studies on the human bond will be presented. From this description, a theoretical proposal to understand the psychosomatic phenomenon will emerge, taking as matrix the conceptual considerations of Danilo Perestrello and Abram Eksterman, Brazilian psychoanalysts, whose nodal point is the understanding of somatic disease in its anthropogenic dimension. The ideas contained in this thought will be the basis for the notion of somatic illness as an answer to the relational field difficulties.

La relación mente-cuerpo, uno de los mayores problemas filosóficos existentes, impregna otras áreas del conocimiento. Desde la práctica psicoterapéutica, el cuidado de los pacientes con enfermedades orgánicas ha contribuido a la aparición del campo psicosomático. Inicialmente, este artículo tiene como objetivo presentar los principales conceptos de las Escuelas de Psicosomática de Chicago y París, las más relevantes en Occidente. En respuesta a estos puntos de vista, reduccionistas y exageradamente intrapsíquicos, se presentarán estudios sobre el vínculo humano. De esta descripción surgirá una propuesta teórica para comprender el fenómeno psicosomático tomando como matriz las consideraciones conceptuales de Danilo Perestrello y Abram Eksterman, psicoanalistas brasileños, cuyo punto nodal es la comprensión de la enfermedad somática en su dimensión antropogénica. Las ideas contenidas en este pensamiento serán la base de la noción de enfermedad somática como respuesta a las dificultades del campo relacional.

"Never sacrifice anything to laboratory work": The "physiological psychology" of Charles Richet (1875-1905).

Whilst best known as a Nobel laureate physiologist, Charles Robert Richet (1850-1935) was also a pioneer of scientific psychology. Starting in 1875 Richet had a leading role in the habilitation of hypnosis, in the institutionalization of psychology in France, and in the introduction of methodological innovations. Authoring several psychology books, Richet's works contributed to the recognition of the scientific nature of the discipline. This role is often underplayed by some historians and psychology textbooks in favor of his later position as a proponent of the controversial discipline he christened metapsychics in 1905, which today lies within the province of parapsychology. In this article, we show how his psychological approach guided by physiology, or physiological psychology, facilitated the reception of psychology. We hypothesize a strong continuity between his physiological psychology and his metapsychics, as he himself considered metapsychics as an advanced branch of physiology, and thus also an outpost of psychology.

Transcutaneous vagus nerve stimulation via tragus or cymba conchae: Are its psychophysiological effects dependent on the stimulation area?

Efforts in optimizing transcutaneous vagus nerve stimulation (tVNS) are crucial to further develop its potential in improving cognitive and autonomic regulation. The present study focused on this topic. The aim was to compare for the first time the main stimulation areas of the ear currently used in studies with tVNS, taking cognitive as well as neurophysiological effects into account. The main areas to be compared with one another were tragus, cymba conchae, and earlobe (sham) stimulation. Post-error slowing, which has already been shown to be influenced by tVNS, was used to investigate the cognitive effects of tVNS when applied on the different auricular areas. On the neurophysiological level, we measured pupillary responses as an index of norepinephrine activity during post-error slowing, and cardiac vagal activity to investigate the activation of neural pathways involved in post-error slowing. Stimulation of different auricular areas led to no differences in post-error slowing and in pupillary responses. However, the neurological processes involved in post-error slowing could be observed, since norepinephrine activity increased after committing an error. Further, there was an increase in cardiac vagal activity over the test period that was independent of the stimulation areas. The results suggest that tVNS targeting the ear might have a non-specific effect on the processing of error commission, on pupillary responses, and on cardiac vagal activity. We conclude that it is necessary to consider alternatives for sham conditions other than electrical earlobe stimulation.

Reconnecting the Brain With the Rest of the Body in Musculoskeletal Pain Research.

A challenge in understanding chronic musculoskeletal pain is that research is often siloed between neuroscience, physical therapy/rehabilitation, orthopedics, and rheumatology which focus respectively on 1) neurally mediated effects on pain processes, 2) behavior and muscle activity, 3) tissue structure, and 4) inflammatory processes. Although these disciplines individually study important aspects of pain, there is a need for more cross-disciplinary research that can bridge between them. Identifying the gaps in knowledge is important to understand the whole body, especially at the interfaces between the silos-between brain function and behavior, between behavior and tissue structure, between musculoskeletal and immune systems, and between peripheral tissues and the nervous system. Research on "mind and body" practices can bridge across these silos and encourage a "whole person" approach to better understand musculoskeletal pain by bringing together the brain and the rest of the body. PERSPECTIVE: Research on chronic musculoskeletal pain is limited by significant knowledge gaps. To be fully integrated, musculoskeletal pain research will need to bridge across tissues, anatomical areas, and body systems. Research on mind and body approaches encourages a "whole person" approach to better understand musculoskeletal pain.

Standardized massage interventions as protocols for the induction of psychophysiological relaxation in the laboratory: a block randomized, controlled trial.

Health and disease are strongly linked to psychophysiological states. While stress research strongly benefits from standardized stressors, no established protocol focuses on the induction of psychophysiological relaxation. To maintain health, functioning regenerative systems are however likely as important as functioning stress systems. Thus, the identification of validated relaxation paradigms is needed. Here, we investigated whether standardized massages are capable of reliably inducing physiological and psychological states of relaxation. Relaxation was indicated by changes in high frequency heart rate variability (HF-HRV), a vagally-mediated heart rate variability component, and repeated ratings of subjective relaxation, and stress levels. Sixty healthy women were randomly assigned to a vagus nerve massage (n = 19), a soft shoulder massage (n = 22), or a resting control group (n = 19). During the intervention, HF-HRV and subjective relaxation increased, while subjective stress decreased significantly in all groups. Both massage interventions elicited significantly higher HF-HRV compared to the control group. Accordingly, both massage protocols increased psychophysiological relaxation, and may serve as useful tools in future research. However, future work will have to determine which of several protocols might be used as a gold standard to induce a psychophysiological state of relaxation in the laboratory.

Effects of Daily Probiotics Supplementation on Anxiety Induced Physiological Parameters among Competitive Football Players.

Competitive football players who undergo strenuous training and frequent competitions are more vulnerable to psychological disorders. Probiotics are capable of reducing these psychological disorders. The present study aimed to determine the effect of daily probiotics supplementation on anxiety induced physiological parameters among competitive football players. The randomized, double-blinded, placebo-controlled trial was conducted on 20 male footballers who received either probiotics (Lactobacillus Casei Shirota strain 3 × 1010 colony forming units (CFU) or a placebo drink over eight weeks. Portable biofeedback devices were used to measure the electroencephalography, heart rate, and electrodermal responses along with cognitive tests at the baseline, week 4, and week 8. Data were statistically analyzed using mixed factorial ANOVA and results revealed that there is no significant difference between the probiotic and placebo groups for heart rate (61.90 bpm ± 5.84 vs. 67.67 bpm ± 8.42, p = 0.09) and electrodermal responses (0.27 µS ± 0.19 vs. 0.41 µS ± 0.12, p = 0.07) after eight weeks. Similarly, brain waves showed no significant changes during the study period except for the theta wave and delta wave at week 4 (p < 0.05). The cognitive test reaction time (digit vigilance test) showed significant improvement in the probiotic group compared to the placebo (p < 0.05). In conclusion, these findings suggest that daily probiotics supplementation may have the potential to modulate the brain waves namely, theta (relaxation) and delta (attention) for better training, brain function, and psychological improvement to exercise. Further research is needed to elucidate the mechanism of current findings.