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Cardiovascular Psychophysiology

From EverybodyWiki Bios & Wiki


Overview

Psychophysiology of stress is the study of how the mind and body work together when an organism experiences psychological stress. It is a subfield of psychology that mainly focuses on human participants, their subjective experiences and appraisals of stressors, and the associated physiological responses. Contemporary views have developed considerably since the concept was first introduced, moving from a focus on purely physiological reactions to more complex models that incorporate psychological appraisal and individual differences.

A distinction is often made between stressors and stress responses. Stressors are events or situations that demand additional attention and effort. They can be external or internal and may threaten a person’s physiological or psychological state. Stress responses are the body’s physiological and behavioral reactions to these stressors. These responses involve multiple systems, including the cardiovascular, endocrine, and the nervous systems, which work together to maintain bodily stability in the face of stress.

Another distinction is between psychophysiology and physiological psychology. The psychophysiology of stress emphasizes mind-body connections and examines how stressors affect various bodily systems using non-invasive methods such as electrocardiogram (ECG) and blood pressure recordings. Physiological psychology, in contrast, is a subdivision of behavioral neuroscience that more broadly investigates the neural mechanisms that support behavior and mental processes.

Psychophysiology of stress typically focuses on human participants because the field is concerned with how laboratory or real-life psychological experiences give rise to stress, which is usually assessed using self-report and behavioral responses alongside physiological measures. Physiological psychology more often relies on animal models or tightly controlled laboratory procedures to understand the biological correlates of behavior. Research in physiological psychology includes investigating how brain regions, neurotransmitters, or lesions affect learning, memory, emotion, and other psychological functions.

Background

Early Foundations

The study of stress and its physiological correlates has a long history. [1][2] [3] Early foundations can be traced to the late 19th and early 20th centuries, marked by Walter Cannon’s theory of “fight-or-flight” responses in animal models. The “Fight-or-flight” response describes how the body rapidly mobilizes physiological resources when confronted with a threat. Cannon later proposed and popularized the concept of homeostasis, which describes the body’s tendency to maintain stable internal conditions, such as temperature, blood pressure, and pH, despite changes in the external environment.

Building on this work, Hans Selye described the General Adaptation Syndrome (GAS) in the 1930s. This framework introduced a new perspective of how prolonged stress can trigger a predictable sequence of physiological responses: alarm, resistance, and exhaustion. Selye later referred to these changes collectively as the "stress response". Although his model was criticized for being general and nonspecific, Selye’s later work contributed to the description of the hypothalamic-pituitary-adrenal axis (HPA axis), which was later confirmed as a central pathway in the body’s reaction to stress.

Stress Research in Psychology (1950s–1970s)

As psychology became more established as a scientific discipline, the study of stress broadened from a primarily biomedical focus to include psychological processes. John Mason highlighted the importance of perception and appraisal in shaping stress responses and argued for treating stress as a specific and nuanced phenomenon rather than a purely physiological reaction.[4] Richard Lazarus further developed this perspective through his Cognitive Appraisal Theory, proposing that whether a situation is perceived as a threat or a challenge can strongly shape the level of stress experienced.

Building on these ideas, the Challenge vs. Threat framework emerged as an influential approach for examining how people’s interpretations of stressors shape physiological and behavioral responses.[5] During this period, early psychophysiological measures such as heart rate, blood pressure, skin conductance, cortisol, and initial Electroencephalography (EEG) recordings were increasingly used to capture objective stress responses.

Mind-body emphasis (1980s–1990s)

In the 1990s, Bruce Goldstein and his colleagues elaborated the concept of allostatic load, building on the earlier idea of allostasis proposed by Peter Sterling and Joseph Eyer.[6][7] Allostasis refers to the adaptive regulatory processes that allow the body to maintain stability by adjusting to environmental demands. Allostatic load refers to the cumulative physiological cost (“wear and tear”) that arises when these processes are activated too frequently or for prolonged periods. This concept provides a framework for understanding chronic stress as the long-term cost of repeated adaptation, rather than only an acute reaction. In contrast to Cannon’s focus on maintaining a single stable set point, allostatic load highlights how the body’s adaptive systems can become dysregulated over time and shift the body’s baseline state.[BP3]

Psychoneuroimmunology (PNI) also became an important area of research during the later 20th century. PNI refers to the study of how psychological processes, including stress and emotion, interact with the nervous and immune systems. This work investigates how these interactions influence susceptibility to infection, disease progression, and broader health outcomes.

The late 20th century was also a period of rapid methodological development. Research designs that combined several types of measures allowed researchers to obtain a more complete picture of mind-body integration. Salivary cortisol became widely adopted in the 1980s and 1990s, enabling repeated, noninvasive assessments of HPA activity across the day. Early brain imaging techniques, such as Positron emission tomography  (PET), provided evidence of brain region activity during stress appraisal and regulation. The development of ambulatory monitoring and ecological momentary assessment methods further expanded research beyond the laboratory, allowing investigators to study stressors and physiological responses in real-world contexts.

Modern Perspectives (2000s to present)

In contemporary research, the psychophysiology of stress integrates cognitive and biological processes within dynamic and complex models. Blascovich’s Biopsychosocial Model emphasizes that stress responses can be adaptive or maladaptive depending on how individuals appraise and cope with challenges, linking psychological interpretations directly to cardiovascular and hormonal reactions.[8]

Methodological advances have continued to expand the range of available tools. Magnetic resonance imaging (MRI) and functional MRI (fMRI) are now widely used as alternatives to PET in neuroscience and clinical research. These techniques provide high-resolution information about brain structure and function and can track neural activity while participants perform tasks. Modern studies often combine brain imaging techniques with traditional psychophysiological measures, such as heart rate variability (HRV), blood pressure, and cortisol, to study the physiological correlates of psychological challenge.

Future Directions

Current research increasingly focuses on stress-management methods and the application of stress-reduction techniques, including mindfulness practices, cognitive-behavioral therapy (CBT), and biofeedback. New technologies such as portable physiological monitors and artificial intelligence are being integrated into study designs, enabling continuous or real-time monitoring of stress-related indicators and allowing for early detection and adaptive feedback.

Biological Foundation

Walter Cannon’s theory of “fight-or-flight” responses, also known as the acute stress response, is rooted in the activity of the autonomic nervous system (ANS). The ANS regulates involuntary bodily functions through two major branches: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The SNS drives the "fight-or-flight" response by rapidly releasing neurotransmitters, such as norepinephrine (noradrenaline) and epinephrine (adrenaline), which increase heart rate, elevate blood pressure, and mobilize energy to confront a threat. The PNS promotes the “rest-and-digest” functions, primarily using the neurotransmitter acetylcholine (ACh) to counterbalance SNS activity by slowing heart rate and supporting recovery and energy conservation. Other neurotransmitters, such as dopamine, also play modulatory roles within this system.

When a situation is perceived as stressful, the SNS rapidly engages, producing physiological changes such as increased heart rate, elevated blood pressure, and heightened respiration. Subsequent engagement of the PNS promotes recovery and helps restore the body to its baseline state. Because the SNS and PNS reflect different aspects of autonomic regulation, many studies measure both systems when examining stress responses.[9]

While the ANS mediates rapid, short-term responses to stress, longer-lasting adaptations are largely governed by the hypothalamic-pituitary-adrenal (HPA) axis. Activity of the HPA axis can trigger the release of hormones from the brain to the adrenal glands, culminating in the secretion of glucocorticoids such as cortisol. These hormones influence a wide range of physiological processes, including metabolism, immune function, and energy regulation.

Lines of research

Stress and Stressors

Stress is commonly defined as a state of emotional strain or tension. Although definitions have evolved, the World Health Organization described stress as “a state of worry or mental tension caused by a difficult situation”.[10] Low levels of stress can enhance alertness and motivation[11], whereas high or prolonged stress can impose a psychological and physiological burden, including impaired memory, increased risk of anxiety and depression, and suppressed immune function, as indicated by meta-analytic reviews.[12][13]

The mechanisms of stress involve coordinated activity across multiple systems, including the sympathetic–adrenal–medullary (SAM) system and the HPA axis.[14] Under stress, the SAM system releases adrenaline and noradrenaline, producing immediate physiological changes, while activation of the HPA axis leads to the release of cortisol, which helps regulate metabolism, immune function, and energy use. [15]

Types of Stress

The stress response is usually triggered by a stimulus (a stressor) that is perceived as threatening and that disrupts homeostasis, the body’s internal balance.[16] Stressor can take many forms, and stress is often classified based on the duration of exposure to one or more stressors.[17] Short exposure to a stressor can be defined as acute stress. When stressors are repeated or prolonged, the resulting response is often termed chronic stress, which can last for days, weeks, or years.

Studies indicate that acute and chronic stress can lead to different outcomes in humans and animal models. For example, a meta-analysis of 113 studies found that acute stress usually impairs memory, except when stress occurs immediately before learning and the material is directly related to the stressful event; in that case, stress can enhance memory.[18] Research on chronic stress has focused on long-term health consequences. Meta-analyses of more than 300 studies suggest that short-term stress can give the immune system a temporary boost, but long-term or repeated stress tends to weaken overall immunity.[19] Brief stressors, such as exams, often affect specific facets of immune function, while chronic stress is associated with broader reductions, particularly in older individuals and those with existing health problems.

Stress in Context of Psychophysiology

In psychophysiological research, stress is often operationalized in laboratory settings as a situation that robustly elicits physiological and psychological responses. Experimental stressors can vary across tasks, such as cognitive challenges or physical exertion, and can be classified as social (for example, public speaking) or non-social (for example, solving a complex puzzle) in nature.[20] Studying stress in controlled settings allows researchers to examine responses while limiting the influence of extraneous variables.

By contrast, daily stress has become an important focus of research because it includes stressors of varying intensity that occur across everyday. Advances in portable monitoring devices have made it easier to collect data in natural environments, allowing investigators to examine how daily stressors relate to ongoing physiological and psychological processes.

Cardiovascular Psychophysiology

The cardiovascular system has been central in the study of stress and health, because it provides objective measures that are closely linked to the SNS and the PNS activity. Interest in the field of cardiovascular psychophysiology was driven by the increasing recognition of the association between stress and cardiovascular disease (CVD).[21] CVD remains a leading cause of mortality worldwide, motivating studies of psychosocial factors that contribute to cardiovascular risk. Psychological states such as depression, anger, hostility, and post-traumatic stress disorder (PTSD) have been associated with heightened cardiovascular reactivity and increased disease vulnerability, highlight the role of emotional and behavioral processes in cardiac health.

A key framework in this area is the reactivity hypothesis.[22] This hypothesis proposes that individuals who exhibit exaggerated cardiovascular responses, such as elevated heart rate or blood pressure, when exposed to acute stressors are at greater risk of developing CVD over time. Subsequent research has provided support for this view, suggesting that chronic exposure to high physiological reactivity may accelerate vascular wear and increase the likelihood of hypertension and atherosclerosis.[PC3]  Recent studies have also examined blunted cardiovascular reactivity as a potentially maladaptive pattern associated with chronic stress, burnout, and depression.[23]  

Several methods are used in cardiovascular psychophysiology. Blood pressure (BP) is one of the most widely used measures and characterizes the pressure of circulating blood against the walls of blood vessels.Systolic blood pressure (SBP) reflects the pressure exerted on arterial walls when the heart contracts, whereas diastolic blood pressure (DBP) reflects the pressure between heartbeats. Electrocardiogram (ECG) records the heart’s strong electrical signals and can be used to derive heart rate (HR) and heart rate variability (HRV). HRV, which reflects beat-to-beat changes in heart rate, provides information about  SNS and PNS influences on the heart. Because HRV is closely linked to respiration, respiratory sinus arrythmia (RSA), a specific measure of HRV tied to the breathing cycle, is often used as a measure of parasympathetic (vagal) activity.

Impedance cardiography (IMP) provides noninvasive information about cardiac function by estimating blood volume changes during the cardiac cycle. IMP yields hemodynamic variables such as stroke volume, cardiac output, and total peripheral resistance. These measures can help clarify the mechanisms supporting cardiovascular reactivity, distinguishing whether changes in blood pressure arise primarily from increased cardiac contractility or from altered vascular resistance, and thereby provide complementary insight into both SNS and PNS contributions.

Endocrine Psychophysiology

Endocrine psychophysiology focuses on how hormones mediate stress responses, mood, metabolism, and social behavior. Compared with neuropsychological and cardiovascular measures, endocrine responses often unfold more slowly and can have relatively long-lasting effects.

Early research on mind-body connection focused on the HPA axis and how bodily cortisol levels change in response to stress. Pioneering work by John Mason examined how stress alters hormone levels, particularly glucocorticoids. This laid the foundation for later research linking these changes to physical and mental health.[24] This line of research was significantly advanced by Bruce S. McEwen's concepts of allostasis and allostatic load as it validates the long-term “wear-and-tear” through changes in the hormone levels.[25] This framework helped explain how chronic psychological stress can contribute to long-term health risks and disease.

Subsequent studies linked dynamic patterns of endocrine activity and dysregulation to outcomes such as depression, anxiety, and immune functions.[26] For example, a meta-analysis involving 208 studies found that stressors involving social-evaluative threat (e.g., public speaking in front of an audience) and lack of control robustly elicited stronger cortisol responses than other types of stressors.[27] These findings highlight the central role of the endocrine system in mediating the long-term effects of psychological stress on the body and mind.

Saliva tests have been widely used to measure hormone levels because they are noninvasive and cost-effective. Contemporary endocrine psychophysiology has broadened in scope to include a range of hormones. Oxytocin and vasopressin are studied for their roles in social bonding, trust, and affiliation, and sex hormoneslike testosterone are examined in relation to competition, aggression, and mood.[28]

Imaging techniques like functional MRI can be combined with hormonal detections to understand how hormones modulate neural circuit involved in behavior and emotion.[29] There is also increasing interest in the factors that contribute to individual differences in endocrine sensitivity, including genetic predispositions (for example, variations in glucocorticoid receptor genes), early life experiences, and ongoing psychological factors such as resilience and coping style.[30]

Other Methods

Beyond cardiovascular and endocrine measures, a variety of noninvasive methods are used to characterize stress responses in laboratory and field settings.

Electrodermal Activity (EDA): Often referred to as skin conductance, EDA measures changes in sweat glandactivity, which are primarily controlled by the sympathetic nervous system. It is a sensitive index of emotional and sympathetic arousal.

Muscular and Ocular Measures: Electromyography (EMG) records the electrical activity from muscles and is often used to quantify muscle tension in regions such as the face or shoulders as a physical correlate of stress. Similarly, eye-tracking and pupillometry (measurement of pupil diameter) can provide information about cognitive and autonomic arousal.

Central Nervous System (CNS) Measures: While fMRI captures changes in blood oxygenation correlated with neural activity, other methods provide fine-grained temporal information about brain processes. Electroencephalography (EEG) measures electrical activity from the scalp, offering high-resolution timing of brain responses. Magnetoencephalography (MEG) records the small magnetic fields produced by brain activity. Near-Infrared Spectroscopy (NIRS) offers a portable way to monitor changes in blood oxygenation changes in the cortex.

Respiration: The rate, depth, and pattern of breathing are also important indicators of stress. Measures such as RSA, derived from ECG and respiration recordings, are often used alongside HRV and breathing data as measure of parasympathetic (vagal) activity.

In addition to these measures, there has been a shift in how data are collected. Rather than relying solely on laboratory tasks, researchers increasingly use ecological momentary assessment (EMA). EMA involves using portable devices and smartphones to repeatedly sample people's real-world experiences and physiological states in daily life.[31] Although EMA data can be more difficult to process and contain more measurement noise than laboratory data, these methods are widely used because they allow researchers to examine stressors and responses as they naturally occur.

Application and Biofeedback

A growing area of psychophysiological research involves applying current findings to develop interventions aimed at reducing stress and promoting well-being. Many of these approaches rely on feedback loops in which physiological signals are monitored and presented to individuals, who then learn to regulate their own responses. The increasing availability of wearable devices, such as portable blood pressure monitors and activity trackers, has made these approaches more accessible.

Biofeedback: A line of study that uses various sensors to provide real-time information about physiological processes, such as heart rate, skin conductance, or muscle tension. This information is used to help individuals learn strategies for regulating these processes. For example, a meta-analysis by Goessl and colleagues[32] reported that HRV biofeedback was associated with reductions in stress and anxiety.

Mindfulness-Based Interventions: Many mindfulness-based stress reduction programs draw on practices from Buddhist meditation and yoga. These interventions involve training nonjudgmental awareness of present-moment experiences. Meta-analytic evidence shows that yoga and mindfulness practices are associated with lowering evening cortisol, reduced salivary cortisol, and lower resting heart rate.[33] These findings suggest that such interventions may help modify cognitive appraisal of stressful events and enhance neural regulation of stress-related pathways.

References

  1. ↑ Goldstein, David S.; Kopin, Irwin J. (2007-06). "Evolution of concepts of stress". Stress (Amsterdam, Netherlands). 10 (2): 109–120. doi:10.1080/10253890701288935. ISSN 1025-3890. PMID 17514579. Check date values in: |date= (help)
  2. ↑ Lu, Siyu; Wei, Fang; Li, Guolin (2021-04-26). "The evolution of the concept of stress and the framework of the stress system". Cell Stress. 5 (6): 76–85. doi:10.15698/cst2021.06.250. ISSN 2523-0204. PMC 8166217 Check |pmc= value (help). PMID 34124582 Check |pmid= value (help).
  3. ↑ Robinson, Alexandra M. (2018-09-01). "Let's Talk about Stress: History of Stress Research". Review of General Psychology. 22 (3): 334–342. doi:10.1037/gpr0000137. ISSN 1089-2680.
  4. ↑ Mason, John W. (1975-06-01). "A Historical View of the Stress Field". Journal of Human Stress. 1 (2): 22–36. doi:10.1080/0097840X.1975.9940405. ISSN 0097-840X. PMID 798013.
  5. ↑ Hase, Adrian; Nietschke, Maximilian; Kłoskowski, Maciej; Szymański, Kacper; Moore, Lee; Jamieson, Jeremy P.; Behnke, Maciej (2025). "The effects of challenge and threat states on performance outcomes: An updated review and meta-analysis of recent findings". EXCLI Journal; 24:Doc151; ISSN 1611-2156. doi:10.17179/EXCLI2024-7995. PMC 11869992 Check |pmc= value (help). PMID 40027878 Check |pmid= value (help).
  6. ↑ Goldstein, David S.; McEwen, Bruce (2002-01). "Allostasis, Homeostats, and the Nature of Stress". Stress. 5 (1): 55–58. doi:10.1080/102538902900012345. ISSN 1025-3890. Check date values in: |date= (help)
  7. ↑ Sterling, P.; Eyer, J. (1988). "Allostasis: A new paradigm to explain arousal pathology".
  8. ↑ Blascovich, Jim; Mendes, Wendy Berry; Hunter, Sarah B.; Salomon, Kristen (1999). "Social "facilitation" as challenge and threat". Journal of Personality and Social Psychology. 77 (1): 68–77. doi:10.1037/0022-3514.77.1.68. ISSN 1939-1315.
  9. ↑ Waxenbaum, Joshua A.; Reddy, Vamsi; Varacallo, Matthew A. (2023-07-24), "Anatomy, Autonomic Nervous System", StatPearls [Internet], StatPearls Publishing, PMID 30969667, retrieved 2025-12-08
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  12. ↑ Shields, Grant S.; Sazma, Matthew A.; McCullough, Andrew M.; Yonelinas, Andrew P. (2017-06). "The effects of acute stress on episodic memory: A meta-analysis and integrative review". Psychological Bulletin. 143 (6): 636–675. doi:10.1037/bul0000100. ISSN 1939-1455. PMC 5436944. PMID 28368148. Check date values in: |date= (help)
  13. ↑ Segerstrom, Suzanne C.; Miller, Gregory E. (2004). "Psychological Stress and the Human Immune System: A Meta-Analytic Study of 30 Years of Inquiry". Psychological Bulletin. 130 (4): 601–630. doi:10.1037/0033-2909.130.4.601. ISSN 1939-1455. PMC 1361287. PMID 15250815.
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  15. ↑ McEwen, Bruce S. (2007-07). "Physiology and Neurobiology of Stress and Adaptation: Central Role of the Brain". Physiological Reviews. 87 (3): 873–904. doi:10.1152/physrev.00041.2006. ISSN 0031-9333. Check date values in: |date= (help)
  16. ↑ "The Fight-or-Flight Response: A Cornerstone of Stress Research", Stress: Concepts, Cognition, Emotion, and Behavior, Academic Press, pp. 33–37, 2016-01-01, doi:10.1016/b978-0-12-800951-2.00004-2, retrieved 2025-12-08
  17. ↑ Valencia-Florez, Kenji Baruch; Sanchez-Castillo, Hugo; Vázquez, Priscila; Zarate, Pavel; Berenice Paz, Diana (2023-08-23). "Stress, a brief update". International Journal of Psychological Research. 16 (2): 105–121. doi:10.21500/20112084.5815. ISSN 2011-7922.
  18. ↑ Shields, Grant S.; Sazma, Matthew A.; McCullough, Andrew M.; Yonelinas, Andrew P. (2017-06). "The effects of acute stress on episodic memory: A meta-analysis and integrative review". Psychological Bulletin. 143 (6): 636–675. doi:10.1037/bul0000100. ISSN 1939-1455. PMC 5436944. PMID 28368148. Check date values in: |date= (help)
  19. ↑ Segerstrom, Suzanne C.; Miller, Gregory E. (2004). "Psychological Stress and the Human Immune System: A Meta-Analytic Study of 30 Years of Inquiry". Psychological Bulletin. 130 (4): 601–630. doi:10.1037/0033-2909.130.4.601. ISSN 1939-1455. PMC 1361287. PMID 15250815.
  20. ↑ Kelsey, Robert M.; Ornduff, Sidney R.; Alpert, Bruce S. (2007-03). "Reliability of cardiovascular reactivity to stress: Internal consistency". Psychophysiology. 44 (2): 216–225. doi:10.1111/j.1469-8986.2007.00499.x. ISSN 0048-5772. Check date values in: |date= (help)
  21. ↑ Olvera Lopez, Edgardo; Ballard, Brian D.; Jan, Arif (2025), "Cardiovascular Disease", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 30571040, retrieved 2025-12-08
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  23. ↑ O'Riordan, Adam; Gallagher, Stephen; Howard, Siobhán (2023-09). "Type D personality and cardiovascular reactivity to acute psychological stress: A systematic review and meta-analysis". Health Psychology: Official Journal of the Division of Health Psychology, American Psychological Association. 42 (9): 628–641. doi:10.1037/hea0001328. ISSN 1930-7810. PMID 37589701 Check |pmid= value (help). Check date values in: |date= (help)
  24. ↑ Sapolsky, Robert M. (1992-11). "Cortisol concentrations and the social significance of rank instability among wild baboons". Psychoneuroendocrinology. 17 (6): 701–709. doi:10.1016/0306-4530(92)90029-7. Check date values in: |date= (help)
  25. ↑ McEwen, Bruce S. (2007-07). "Physiology and Neurobiology of Stress and Adaptation: Central Role of the Brain". Physiological Reviews. 87 (3): 873–904. doi:10.1152/physrev.00041.2006. ISSN 0031-9333. Check date values in: |date= (help)
  26. ↑ Miller, Gregory E.; Chen, Edith; Zhou, Eric S. (2007). "If it goes up, must it come down? Chronic stress and the hypothalamic-pituitary-adrenocortical axis in humans". Psychological Bulletin. 133 (1): 25–45. doi:10.1037/0033-2909.133.1.25. ISSN 1939-1455.
  27. ↑ Dickerson, Sally S.; Kemeny, Margaret E. (2004). "Acute Stressors and Cortisol Responses: A Theoretical Integration and Synthesis of Laboratory Research". Psychological Bulletin. 130 (3): 355–391. doi:10.1037/0033-2909.130.3.355. ISSN 1939-1455.
  28. ↑ Bos, Peter A.; Panksepp, Jaak; Bluthé, Rose-Marie; Honk, Jack van (2012-01). "Acute effects of steroid hormones and neuropeptides on human social–emotional behavior: A review of single administration studies". Frontiers in Neuroendocrinology. 33 (1): 17–35. doi:10.1016/j.yfrne.2011.01.002. Check date values in: |date= (help)
  29. ↑ Prakash, Y. S., ed. (2011-01-31). Comprehensive Physiology (1 ed.). Wiley. doi:10.1002/cphy.c150015. ISBN 978-0-470-65071-4. PMC 4867107. PMID 27065163. Search this book on
  30. ↑ Boyce, W. Thomas; Ellis, Bruce J. (2005-06). "Biological sensitivity to context: I. An evolutionary–developmental theory of the origins and functions of stress reactivity". Development and Psychopathology. 17 (02). doi:10.1017/S0954579405050145. ISSN 0954-5794. Check date values in: |date= (help)
  31. ↑ Shiffman, Saul; Stone, Arthur A.; Hufford, Michael R. (2008-04-01). "Ecological Momentary Assessment". Annual Review of Clinical Psychology. 4 (1): 1–32. doi:10.1146/annurev.clinpsy.3.022806.091415. ISSN 1548-5943.
  32. ↑ Goessl, V. C.; Curtiss, J. E.; Hofmann, S. G. (2017-11). "The effect of heart rate variability biofeedback training on stress and anxiety: a meta-analysis". Psychological Medicine. 47 (15): 2578–2586. doi:10.1017/S0033291717001003. ISSN 1469-8978. PMID 28478782. Check date values in: |date= (help)
  33. ↑ Pascoe, Michaela C.; Thompson, David R.; Ski, Chantal F. (2017-12). "Yoga, mindfulness-based stress reduction and stress-related physiological measures: A meta-analysis". Psychoneuroendocrinology. 86: 152–168. doi:10.1016/j.psyneuen.2017.08.008. ISSN 1873-3360. PMID 28963884. Check date values in: |date= (help)


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