Stressor

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A stressor is a chemical or biological agent, environmental condition, external stimulus or an event seen as causing stress to an organism. [1] Psychologically speaking, a stressor can be events or environments that individuals might consider demanding, challenging, and/or threatening individual safety. [2]

Contents

Events or objects that may trigger a stress response may include:

Stressors can cause physical, chemical and mental responses internally. Physical stressors produce mechanical stresses on skin, bones, ligaments, tendons, muscles and nerves that cause tissue deformation and (in extreme cases) tissue failure. Chemical stresses also produce biomechanical responses associated with metabolism and tissue repair. Physical stressors may produce pain and impair work performance. Chronic pain and impairment requiring medical attention may result from extreme physical stressors or if there is not sufficient recovery time between successive exposures. [4] [5] A recent study shows that physical office clutter could be an example of physical stressors in a workplace setting. [3]

Stressors may also affect mental function and performance. One possible mechanism involves stimulation of the hypothalamus, CRF (corticotropin release factor) -> pituitary gland releases ACTH (adrenocorticotropic hormone) -> adrenal cortex secretes various stress hormones (e.g., cortisol) -> stress hormones (30 varieties) travel in the blood stream to relevant organs, e.g., glands, heart, intestines -> flight-or-fight response. Between this flow there is an alternate path that can be taken after the stressor is transferred to the hypothalamus, which leads to the sympathetic nervous system; after which the adrenal medulla secretes epinephrine. [6] Mental and social stressors may affect behavior and how individuals respond to physical and chemical stressors.

Life requires everyone to make sudden and planned adjustments to meet its demands, but greater demands come with a greater adjustment and possibly more stress. Determining the impact of these various stressors allow individuals to decide the relationship between the types of stressors and the degree of distress. Identifying the stressor-stress relationship must involve quantifying the impact of life demands and all stress spurred by it. To do this, the individual will use subjective measures and objective measures, depending on the situation. Individuals determine the degree of adjustment themselves in subjective measures, but a degree of adjustment will be or has already been assigned to the individual in an objective measure. The degrees of adjustment are measured by life change units, where one unit equals a degree of adjustment necessary to cope with the life change. The practice of measuring life change units led to the creation of many scales composed of these units that are tailored to certain life events or situations, such as social readjustment and college students. [7] [8] Once the relationship between the stressor (event) and the stress, the individual can then begin to focus on the stress magnitude and the stress itself. For life events with a lower magnitude of impact, the ability to cope and adjust may not be very complex and relatively brief. But for others, life events with high magnitudes can impact lives in many ways for an extended amount of time. The various stressors listed above can all have events or stressors that range anywhere from minor to traumatic. Traumatic events involve very debilitating stressors, and oftentimes these stressors are uncontrollable. Traumatic events can deplete an individual's coping resources to an extent where the individual may develop acute stress disorder or even post-traumatic stress disorder. Acute stress disorder is a psychological disorder where a traumatic event that is life-threatening or threatens an injury causes a reaction of fear and helplessness lasting up to four weeks. Post-traumatic stress disorder has symptoms of lasting longer than one month, and the first symptom is a history of experiencing a traumatic event followed with a reaction of intense fear, helplessness, or horror. The traumatic event is persistently re-experienced in one of these ways: recurrent distressing recollections, dreams, flashbacks, illusions, or a sense of reliving the experience, and distress or physical arousal by reminders of this event. The individual suffers from a persistent avoidance of reminders of the event. People who have been abused, victimized, or terrorized are often more susceptible to stress disorders. [9] [10] No matter the magnitude of the stressor and stress, most stressor-stress relationships can be evaluated and determined - either by the individual or a by psychologist. Without proper attention, stress can produce severe effects on mental health and the immune system, which can eventually lead to effects on the physical body. Therapeutic measures are often taken to help replenish and rebuild the individual's coping resources while simultaneously aiding the individual in dealing with the current stressor.

Psychological stressors

Stressors occur when an individual is unable to cope with the demands of their environment (such as crippling debt with no clear path to resolving it). [2] Generally, stressors take many forms, such as: traumatic events, life demands, sudden medical emergencies, and daily inconveniences, to name a few. There are also a variety of characteristics that a stressor may possess (different durations, intensity, predictability, and controllability). [2]

Measuring psychological stress

Due to the wide impact and the far-reaching consequences of psychological stressors (especially their profound effects on mental well-being), it is particularly important to devise tools to measure such stressors. Two common psychological stress tests include the Perceived Stress Scale (PSS) [11] devised by American psychologist Sheldon Cohen, and the Social Readjustment Rating Scale (SRRS) [12] or the Holmes-Rahe Stress Scale. While the PSS is a traditional Likert scale, the SRRS assigns specific predefined numerical values to stressors.

Biological responses to stressors

Traumatic events or any type of shock to the body can cause an acute stress response disorder (ASD). The extent to which one experiences ASD depends on the extent of the shock. If the shock was pushed past a certain extreme after a particular period in time ASD can develop into what is commonly known as Post-traumatic stress disorder (PTSD). [13] There are two ways that the body responds biologically in order to reduce the amount of stress an individual is experiencing. One thing that the body does to combat stressors is to create stress hormones, which in turn create energy reservoirs that are there in case a stressful event were to occur. The second way our biological components respond is through an individual's cells. Depending on the situation our cells obtain more energy in order to combat any negative stressor and any other activity those cells are involved in seize. [14]

Predictability and controllability

When individuals are informed about events before they occur, the magnitude of the stressor is less than when compared to individuals who were not informed of the stressor. [15] For example, an individual would prefer to know when they have a deadline ahead of time in order to prepare for it in advance, rather than find out about the deadline the day of. In knowing that there is a deadline ahead of time, the intensity of the stressor is smaller for the individual, as opposed to the magnitude of intensity for the other unfortunate individual who found out about the deadline the day of. When this was tested, psychologists found that when given the choice, individuals had a preference for the predictable stressors, rather than the unpredictable stressors. [16]

Additionally, the degree to which the stressor can be controlled plays a variable in how the individual perceives stress. [2] Research has found that if an individual is able to take some control over the stressor, then the level of stress will be decreased. During this study, it was found that the individuals become increasingly anxious and distressed if they were unable to control their environment. [17] As an example, imagine an individual who detests baths in the Middle Ages, taking a bath. If the individual was forced to take the bath with no control over the temperature of the bath (one of the variables), then their anxiety and stress levels would be higher than if the individual was given some control over the environment (such as being able to control the temperature of the water).

Based on these two principles (predictability and control), there are two hypotheses that attempt to account for these preferences; the preparatory response hypothesis and safety hypothesis attempt to accommodate these preferences.

Preparatory response hypothesis

The idea behind this hypothesis is that an organism can better prepare for an event if they are informed beforehand, as this allows them to prepare for it (biologically). [2] In biologically preparing for this event beforehand, the individual is able to better decrease the event's aversiveness. [18] In knowing when a potential stressor will occur (such as an exam), the individual could, in theory, prepare for it in advance, thus decreasing the stress that may result from that event.

Safety hypothesis

In this hypothesis, there are two time periods, one in which is deemed safe (where there is no stressor), and one which is deemed unsafe (in which the stressor is present). [19] This is similar to procrastination and cramming; during the safe intervals (weeks before an exam) the individual is relaxed and not anxious, and during the unsafe intervals (the day or night before the exam) the individual most likely experiences anxiety. [2]

See also

Related Research Articles

Post-traumatic stress disorder (PTSD) is a mental and behavioral disorder that develops from experiencing a traumatic event, such as sexual assault, warfare, traffic collisions, child abuse, domestic violence, or other threats on a person's life or well-being. Symptoms may include disturbing thoughts, feelings, or dreams related to the events, mental or physical distress to trauma-related cues, attempts to avoid trauma-related cues, alterations in the way a person thinks and feels, and an increase in the fight-or-flight response. These symptoms last for more than a month after the event. Young children are less likely to show distress, but instead may express their memories through play. A person with PTSD is at a higher risk of suicide and intentional self-harm.

<span class="mw-page-title-main">Stress (biology)</span> Organisms response to a stressor such as an environmental condition or a stimulus

Stress, whether physiological, biological or psychological, is an organism's response to a stressor such as an environmental condition. Stress is the body's method of reacting to a condition such as a threat, challenge or physical and psychological barrier. There are two hormones that an individual produces during a stressful situation, well known as adrenaline and cortisol. There are two kinds of stress hormone levels. Resting (basal) cortisol levels are normal everyday quantities that are essential for standard functioning. Reactive cortisol levels are increases in cortisol in response to stressors. Stimuli that alter an organism's environment are responded to by multiple systems in the body. In humans and most mammals, the autonomic nervous system and hypothalamic-pituitary-adrenal (HPA) axis are the two major systems that respond to stress.

Abnormal psychology is the branch of psychology that studies unusual patterns of behavior, emotion, and thought, which could possibly be understood as a mental disorder. Although many behaviors could be considered as abnormal, this branch of psychology typically deals with behavior in a clinical context. There is a long history of attempts to understand and control behavior deemed to be aberrant or deviant, and there is often cultural variation in the approach taken. The field of abnormal psychology identifies multiple causes for different conditions, employing diverse theories from the general field of psychology and elsewhere, and much still hinges on what exactly is meant by "abnormal". There has traditionally been a divide between psychological and biological explanations, reflecting a philosophical dualism in regard to the mind-body problem. There have also been different approaches in trying to classify mental disorders. Abnormal includes three different categories; they are subnormal, supernormal and paranormal.

Psychological trauma is an emotional response caused by severe distressing events that are outside the normal range of human experiences, such as violence, rape, or terrorist attack. The event must be understood by the affected person as directly threatening the affected person or their loved ones with death, severe bodily injury, or sexual violence; indirect exposure, such as from watching television news, may be extremely distressing and can produce an involuntary and possibly overwhelming physiological stress response, but does not produce trauma per se.

Coping refers to conscious strategies used to reduce unpleasant emotions. Coping strategies can be cognitions or behaviors and can be individual or social. Coping is to deal with and overcome struggles and difficulties in life. It is a way for us to maintain our mental and emotional well-being. Everybody has a way of handling the hard events that occur in our life and that is what it means to cope. Coping can be healthy and productive, or destructive and unhealthy for you or others. It is recommended that an individual copes in ways that will be beneficial and healthy. "Managing your stress well can help you feel better physically and psychologically and it can impact your ability to perform your best."

Acute stress disorder is a psychological response to a terrifying, traumatic or surprising experience. It may bring about delayed stress reactions if not correctly addressed. Acute stress may present in reactions which include but are not limited to: intrusive or dissociative symptoms, and reactivity symptoms such as avoidance or arousal. Reactions may be exhibited for days or weeks after the traumatic event.

<span class="mw-page-title-main">Diathesis–stress model</span> Psychological theory

The diathesis-stress model, also known as the vulnerability–stress model, is a psychological theory that attempts to explain a disorder, or its trajectory, as the result of an interaction between a predispositional vulnerability, the diathesis, and stress caused by life experiences. The term diathesis derives from the Greek term (διάθεσις) for a predisposition or sensibility. A diathesis can take the form of genetic, psychological, biological, or situational factors. A large range of differences exists among individuals' vulnerabilities to the development of a disorder.

Psychological resilience is the ability to cope mentally and emotionally with a crisis, or to return to pre-crisis status quickly.

Childhood trauma is often described as serious adverse childhood experiences (ACEs). Children may go through a range of experiences that classify as psychological trauma; these might include neglect, abandonment, sexual abuse, emotional abuse, and physical abuse, witnessing abuse of a sibling or parent, or having a mentally ill parent. These events have profound psychological, physiological, and sociological impacts and can have negative, lasting effects on health and well-being such as unsocial behaviors, attention deficit hyperactivity disorder (ADHD), and sleep disturbances. Similarly, children whose mothers have experienced traumatic or stressful events during pregnancy have an increased risk of mental health disorders and other neurodevelopmental disorders.

Memory and trauma is the deleterious effects that physical or psychological trauma has on memory.

In psychology, posttraumatic growth (PTG) is positive psychological change experienced as a result of struggling with highly challenging, highly stressful life circumstances. These circumstances represent significant challenges to the adaptive resources of the individual, and pose significant challenges to the individual's way of understanding the world and their place in it. Posttraumatic growth involves "life-changing" psychological shifts in thinking and relating to the world and the self, that contribute to a personal process of change, that is deeply meaningful.

Victimization refers to a person being made into a victim by someone else and can take on psychological as well as physical forms, both of which are damaging to victims. Forms of victimization include bullying or peer victimization, physical abuse, sexual abuse, verbal abuse, robbery, and assault. Some of these forms of victimization are commonly associated with certain populations, but they can happen to others as well. For example, bullying or peer victimization is most commonly studied in children and adolescents but also takes place between adults. Although anyone may be victimized, particular groups may be more susceptible to certain types of victimization and as a result to the symptoms and consequences that follow. Individuals respond to victimization in a wide variety of ways, so noticeable symptoms of victimization will vary from person to person. These symptoms may take on several different forms, be associated with specific forms of victimization, and be moderated by individual characteristics of the victim and/or experiences after victimization.

Psychological hardiness, alternatively referred to as personality hardiness or cognitive hardiness in the literature, is a personality style first introduced by Suzanne C. Kobasa in 1979. Kobasa described a pattern of personality characteristics that distinguished managers and executives who remained healthy under life stress, as compared to those who developed health problems. In the following years, the concept of hardiness was further elaborated in a book and a series of research reports by Salvatore Maddi, Kobasa and their graduate students at the University of Chicago.

<span class="mw-page-title-main">Effects of stress on memory</span> Overview of the effects of stress on memory

The effects of stress on memory include interference with a person's capacity to encode memory and the ability to retrieve information. Stimuli, like stress, improved memory when it was related to learning the subject. During times of stress, the body reacts by secreting stress hormones into the bloodstream. Stress can cause acute and chronic changes in certain brain areas which can cause long-term damage. Over-secretion of stress hormones most frequently impairs long-term delayed recall memory, but can enhance short-term, immediate recall memory. This enhancement is particularly relative in emotional memory. In particular, the hippocampus, prefrontal cortex and the amygdala are affected. One class of stress hormone responsible for negatively affecting long-term, delayed recall memory is the glucocorticoids (GCs), the most notable of which is cortisol. Glucocorticoids facilitate and impair the actions of stress in the brain memory process. Cortisol is a known biomarker for stress. Under normal circumstances, the hippocampus regulates the production of cortisol through negative feedback because it has many receptors that are sensitive to these stress hormones. However, an excess of cortisol can impair the ability of the hippocampus to both encode and recall memories. These stress hormones are also hindering the hippocampus from receiving enough energy by diverting glucose levels to surrounding muscles.

<span class="mw-page-title-main">Psychological stress</span> Feeling of strain and pressure

In psychology, stress is a feeling of emotional strain and pressure. Stress is a type of psychological pain. Small amounts of stress may be beneficial, as it can improve athletic performance, motivation and reaction to the environment. Excessive amounts of stress, however, can increase the risk of strokes, heart attacks, ulcers, and mental illnesses such as depression and also aggravation of a pre-existing condition.

PTSD or post-traumatic stress disorder, is a psychiatric disorder characterised by intrusive thoughts and memories, dreams or flashbacks of the event; avoidance of people, places and activities that remind the individual of the event; ongoing negative beliefs about oneself or the world, mood changes and persistent feelings of anger, guilt or fear; alterations in arousal such as increased irritability, angry outbursts, being hypervigilant, or having difficulty with concentration and sleep.

Social stress is stress that stems from one's relationships with others and from the social environment in general. Based on the appraisal theory of emotion, stress arises when a person evaluates a situation as personally relevant and perceives that they do not have the resources to cope or handle the specific situation.

Emotional abandonment is a subjective emotional state in which people feel undesired, left behind, insecure, or discarded. People experiencing emotional abandonment may feel at a loss. They may feel like they have been cut off from a crucial source of sustenance or feel withdrawn, either suddenly or through a process of erosion. Emotional abandonment can manifest through loss or separation from a loved one.

Post-traumatic stress disorder (PTSD) can affect about 3.6% of the U.S. population each year, and 6.8% of the U.S. population over a lifetime. 8.4% of people in the U.S. are diagnosed with substance use disorders (SUD). Of those with a diagnosis of PTSD, a co-occurring, or comorbid diagnosis of a SUD is present in 20–35% of that clinical population.

The Shift-and-persist model has emerged in order to account for unintuitive, positive health outcomes in some individuals of low socioeconomic status. A large body of research has previously linked low socioeconomic status to poor physical and mental health outcomes, including early mortality. Low socioeconomic status is hypothesized to get "under the skin" by producing chronic activation of the sympathetic nervous system and hypothalamic–pituitary–adrenal axis, which increases allostatic load, leading to the pathogenesis of chronic disease. However, some individuals of low socioeconomic status do not appear to experience the expected, negative health effects associated with growing up in poverty. To account for this, the Shift-and-Persist Model proposes that, as children, some individuals of low socioeconomic status learn adaptive strategies for regulating their emotions ("shifting") and focusing on their goals ("persisting") in the face of chronic adversity. According to this model, the use of shift-and-persist strategies diminishes the typical negative effects of adversity on health by leading to more adaptive biological, cognitive, and behavioral responses to daily stressors.

References

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Further reading