Anticipatory Stressors Research Articles

STRESSORS OF FILIAL ANXIETY REGARDING ANTICIPATED CARE OF OLDER PARENTS: EVIDENCE FROM CHINESE ADULT CHILDREN

Abstract Evidence has shown that the anticipation of providing care for a parent in the future can be anxiety-provoking for adult children, especially for one-child generations in China. Filial anxiety may influence adult children’s transition to the caregiver role and may bring about heightened caregiving stress. However, this phenomenon remains insufficiently studied among Chinese adult children. Drawing on the Stress Process Model and proactive coping theory, this study examined how primary stressors (i.e., parent’s declining health, adverse psychological health, and lack of eldercare resources), anticipatory stressor (i.e., anticipated parental care needs), and psychosocial resources (i.e., sibling number, the value of filial obligation, intergenerational relationship, work stress, and family stress) influenced the multiple domains of filial anxiety (i.e., Filial Anxiety-Ability, Filial Anxiety-Responsibility, and Filial Anxiety-Welfare). A face-to-face questionnaire survey was conducted with 530 Chinese adult children aged between 26 and 40 years in Shenzhen, China. Descriptive analyses and regression analyses were conducted. Results demonstrated that Chinese adult children experienced a higher level of overall filial anxiety than their Western counterparts and reported a particularly high level of filial anxiety about their parent’s welfare. Adult children with higher work and family stress, with fewer siblings, and whose parents lack eldercare resources were more likely to experience a high level of filial anxiety. This study systematically investigated the multiple stressors of filial anxiety. The findings have implications for the development of effective interventions to reduce adult children’s future caregiving concerns and better prepare them for their older parents’ future care needs.

Mental Health in Farming Communities.

Occupational stressors are causing unprecedented levels of stress, depression, and suicide among our nation's farmers, and little is known about how farmers view their personal stress and potential stress-relieving strategies. The current study used a descriptive qualitative approach to conduct focus groups comprising farmers and farm family members (N = 26). Participants were recruited using a snowball approach based on the investigators' connections to farming communities. Preliminary analysis indicates that primary stressors are: lack of control over many aspects of farming and the public's lack of understanding/appreciation for farming. In addition, two communities identified high levels of anticipatory stressors. Despite these stressors, they continue to farm because of their love for farm life and their generational connection with the land. To decrease farmer stress, participants suggested educating the public about farm life and the impact farming has on the general public, creating social groups for farmers to talk to each other, and sharing the farmer story. [Journal of Psychosocial Nursing and Mental Health Services, 61(10), 39-43.].

Do categorically distinct stressors alter the attention to visual food cues?

Stressor exposure affects food intake as well as the preference for high or low palatability foods, but little is known about how stressor types impact the visual attention to food images. We used eye tracking methodology in humans to determine if activation of the hypothalamus–pituitary-adrenal (HPA) axis and sympathetic nervous system is associated with changes in attention to food images as determined by measuring changes in oculomotor activity. Specifically, we tested two questions: 1) Do categorically distinct stressors alter aspects of visual attention to food images as determined by oculomotor activity (i.e., saccade latency, gaze duration, and saccade bouts)? 2) Do categorically distinct stressors differentially affect visual attention to food images of high or low palatability? A total of sixty participants were randomly divided into one of three test groups: controls, an anticipatory stressor group, or a reactive stressor group. We measured salivary cortisol and salivary alpha-amylase (sAA) before and after stressor exposure to confirm activation of the HPA axis and sympathetic nervous system, respectively. Following stressor exposure participants performed an eye-tracking test using a standardized food picture database (Food-pics). We analyzed saccade latency, gaze duration, and saccade bouts in balanced pairs of food and non-food images. Salivary cortisol was elevated by both stressors, although the elevation in salivary cortisol to the reactive stressor was driven by women only. sAA was elevated only by the anticipatory stressor. There were main effects of image type for all three eye-tracking variables, with initial saccades of shorter latency to food images and longer gaze duration and more saccade bouts with food images. Participants exposed to the reactive stressor reduced gaze duration on food images relative to controls, and this affect was not linked to palatability or salivary cortisol levels. We conclude that the reactive stressor decreased time spent looking at food, but not non-food, images. These data are partly consistent with the idea that reactive stressors reduce attention to non-critical visual signals.

Childhood Abuse, Goal-Striving Stress and Self-Esteem: An Explanatory Role for Perceptions of Divine Control?

Early life course events and experiences affect lifelong processes of human development, and at the forefront of life course research, is how negative conditions during childhood compromise adult well-being. In the current study, we propose that individuals who experience early life adversity may be more susceptible to the effect of stressors that are also very much rooted in the self-concept, namely goal-striving stress, the feeling of falling short of one's expectations. Using data from the 2014 Nashville Stress and Health Study from the United States (NSAHS), we examine this process and consider how elements of religiosity, particularly beliefs in God's causal influence in human life (divine control) explain why goal-striving stress takes a larger toll on the self-esteem of individuals who experienced childhood abuse. Our findings indicate that (1) childhood abuse was positively associated with goal-striving stress and inversely associated with self-esteem, (2) goal-striving stress was inversely associated with self-esteem, (3) goal-striving stress exacerbated the association between childhood abuse and lower self-esteem. Mediated-moderation analyses also revealed that (4) lower perceptions of divine control explain why goal-striving stress was more damaging for victims of childhood abuse. Taken together, this study contributes to a growing body of work on anticipatory stressors and linkages to the self-concept for victims of early life adversity, and how adversity early in the life course might undermine key religious resources like divine control that may otherwise mitigate the noxious effects of stress.

An ecological approach for investigations of the anticipatory cortisol stress response

Real-world anticipatory stressors account for rising rates of chronic psychophysiological stress and adverse health outcomes, yet the literature lacks an effective approach to study the anticipatory cortisol stress response. An extended pre-stressor period to capture peak anticipatory cortisol is not conducive to laboratory stress manipulations but is inherent to naturalistic stressors. Naturalistic approaches have been frequently utilized, but few studies included valid baseline and temporally proximate pre-post cortisol measures to operationalize the anticipatory cortisol stress response, and none have differentiated anticipatory from reactive response types. To address these gaps, this study sought to establish an effective and easy-to-implement protocol to investigate the anticipatory cortisol stress response. Saliva was sampled from 78 healthy college students (69 % female) before and after a 50-minute class period on a day of a lecture (baseline) and day of a scheduled written exam (stressor). The overall sample displayed an anticipatory stress response, operationalized as peak pre-exam cortisol and post-exam levels that returned to baseline, while individual response patterns were also detected and subsequently differentiated into anticipatory (37 %), reactive (9 %), anticipatory-reactive (13 %), and non- (41 %) response groups. These responses are consistent with those previously differentiated in a controlled laboratory setting with an exhaustive sampling schedule; yet this study captured a larger number of pre-stressor (anticipatory) cortisol peaks. Subjective measures of psychological stress were also examined. Findings demonstrate the effectiveness of a college written exam and validity of a baseline-pre-post sampling design for operationalizing the anticipatory cortisol stress response and differentiating within-sample response variability.

The Contributions of Social Stressors and Coping Resources to Psychological Distress Among Those Who Experienced Furlough or Job Loss Due to COVID-19

The COVID-19 pandemic precipitated a global economic recession resulting in widespread unemployment and worker furloughs. Using national survey data (n = 2,000), this study examines whether and how employment-based discrepancies in financial strains, anticipatory stressors, and personal coping resources contribute to elevated psychological distress among those who experienced involuntary job displacement due to COVID-19. Disaggregating displaced workers into those who were furloughed and those who lost their job due to the pandemic, I find that both groups report more depressive symptoms and anger than the stably employed and respondents whose unemployment is not COVID-related. Greater financial strains and smaller reserves of coping resources contribute in varying degrees to heightened levels of distress found among displaced workers, however, anticipatory stress about economic security is the predominant factor driving disparities in psychological distress. These findings, and the central role of anticipatory stressors in shaping employment-based differences in mental health during the pandemic, are discussed.

Stressors experienced by nurses providing end-of-life care in intensive care unit (ICU): A Qualitative study

Background of Study: Palliative care is unique in that the service focuses on the needs of dying patients and their families as opposed to focusing on maintaining critical bodily functions, as in critical care nursing, or on improving functional capacity, as in rehabilitation nursing (Martens, 2009). The philosophy of palliative care nursing includes providing care to patients using medical science combined with compassion and caring. Patients may be cared for in hospital wards in acute care settings, in specialist hospice or palliative care units, in aged care homes, or in their own home. Palliative care specialist nurses primarily have generalist nursing skills with various levels of specialisation and post-registration education, including palliative care certification. (International Journal of Palliative Nursing 2012).Aims and Objectives: Purpose of the study is to gain a deeper understanding of the stressors experienced by ICU nurses providing End of Life Care and to describe stressors experienced by nurses working in ICU providing End of Life Care.Materials and Methods: Phenomenological research design was used.10 nurses working in ICU and giving End of life Care were selected using purposive sampling technique as per the pre-determined inclusion criteria. Semi-structured interview schedule was used for data collection. Voice recording of the conversation was done, the transcript was then thematically analysed using Open Code Software.Results: By the findings of the study themes emerged as Emotional Stressor, Personal Stressor, Professional Stressor, Anticipatory Stressor and Experiential Stressor.Conclusion: Limited research has been undertaken on the provision of End of Life care by nurses in the Intensive care setting and thus a need arises to conduct a study in this area. Identification and development of strategies to support nurses in the provision of End Of life care is required to ensure quality care and to minimise stress and eliminate burnout.

Chronic Fatigue in Cancer, Brain Connectivity and Reluctance to Engage in Physical Activity: A Mini-Review.

A large amount of evidence shows that after a cancer diagnosis, patients significantly reduce their level of physical activity. Usually, this reduction is attributed to cancer-related fatigue. However, to our knowledge, no study has clearly demonstrated that fatigue alters effort-based decision-making in cancer. This mini-review aimed to provide evidence that chronic fatigue in cancer patients causes changes in brain connectivity that impact effort-based decision-making. Indeed, three patterns of activation to compensate for dysfunctional networks have been reported: greater variability in the executive network and hyperactivation in the executive network, which account for less efficient and costly processes in the frontal cortex, and reduced deactivation in the default mode network. Nevertheless, these activation patterns are also observed with other factors, such as anticipatory stressors (worry, rumination or sleep loss), that might also cause reluctance to engage in physical activity. Effort-based decision-making involving weighing costs against benefits and physical activity interventions should increase immediate benefits to facilitate engagement in effortful activities.

Evidence of anticipatory immune and hormonal responses to predation risk in an echinoderm

Recent efforts have been devoted to the link between responses to non-physical stressors and immune states in animals, mostly using human and other vertebrate models. Despite evolutionary relevance, comparatively limited work on the appraisal of predation risk and aspects of cognitive ecology and ecoimmunology has been carried out in non-chordate animals. The present study explored the capacity of holothuroid echinoderms to display an immune response to both reactive and anticipatory predatory stressors. Experimental trials and a mix of behavioural, cellular and hormonal markers were used, with a focus on coelomocytes (analogues of mammalian leukocytes), which are the main components of the echinoderm innate immunity. Findings suggest that holothuroids can not only appraise threatening cues (i.e. scent of a predator or alarm signals from injured conspecifics) but prepare themselves immunologically, presumably to cope more efficiently with potential future injuries. The responses share features with recently defined central emotional states and wane after prolonged stress in a manner akin to habituation, which are traits that have rarely been shown in non-vertebrates, and never in echinoderms. Because echinoderms sit alongside chordates in the deuterostome clade, such findings offer unique insights into the adaptive value and evolution of stress responses in animals.

Use of Audiobooks as an Environmental Distractor to Decrease State Anxiety in Children Waiting in the Pediatric Emergency Department: A Pilot and Feasibility Study.

Objectives: Anxiety and anticipatory stressors are commonly experienced by children visiting the Pediatric Emergency Department (PED), but little research exists that addresses the efficacy of interventions to decrease this stress. This one-sample pretest-postest pilot study gathered preliminary data on the feasibility and effectiveness of utilizing audiobooks to reduce fear and state anxiety in children in the PED.Methods: Participants were 131 children in kindergarten through 8th grade (M = 9.4 years, 54% female), triaged urgent or emergent, presenting to the PED. Participants self-reported fear (Children's Fear Scale) and state anxiety (modified State-Trait Anxiety Inventory for Children; mSTAIC) before and after listening to an age-appropriate audiobook (two options). Data regarding patient experience were also collected. Paired samples t-test was used to examine pre–post intervention changes in fear and state anxiety.Results: Significant, albeit small, improvements in fear and the mSTAIC states of nervous, calm, happy, and relaxed were found after use of the audiobook (Cohen's dz = 0.22–0.35). Small, yet significant correlations were found between child age/grade level and improvements in fear and in the mSTAIC states of scared and relaxed, suggesting that the audiobook was more beneficial for older participants. Over 60% of participants liked the audiobook content “a lot” as well as enjoyed listening to the audiobook “a lot.” Without prompting, 15% of participants requested to listen to an additional audiobook.Conclusions: Listening to an audiobook is feasible and could be effective in decreasing fear and state anxiety for children during a waiting period in the PED. The technology is low-cost, simple, and portable. The results of this study should be interpreted with prudence due to the lack of a control group and results that, although significant, were modest based on effect size conventions; future studies should explore the impact of audiobooks on patient stress with an expanded sample size and control group.

Police Encounters as Stressors: Associations with Depression and Anxiety across Race

Stress researchers have emphasized the relationship between social stress and mental health. However, research investigating police brutality as a stressor is scarce. The authors conceptualize police brutality as a stressor, examining racial variation in its effects on mental health. Data came from the Survey of the Health of Urban Residents in the United States ( n = 4,389). Negative encounters with the police were found to be associated with depressed mood and anxiety. The relationship between encounters with the police and depressed mood was stronger among Black respondents and Latinxs compared with Whites. Regardless of personal encounters with the police, the anticipatory stress of police brutality—concern that one might become a victim of police brutality—was associated with depression and anxiety. These findings highlight police brutality as an anticipatory stressor and have implications for whiteness as a resource that protects from the stress of negative police encounters.

The Limits of Gaining Rights while Remaining Marginalized: The Deferred Action for Childhood Arrivals (DACA) Program and the Psychological Wellbeing of Latina/o Undocumented Youth

Abstract Policies that expand the rights of marginalized groups provide an additional level of structural integration, but these changes do not always come with broad social acceptance or recognition. What happens when a legally marginalized group attains increased rights but not full political or social inclusion? In particular, what are the mental health implications of these transitions for impacted groups? We bring together theories of liminal legality and stress process to offer a framework for understanding how expansions in the legal rights of a highly politicized and vulnerable social group can be initially beneficial, but can attenuate due to renewed or new stress events, chronic stressors, and anticipatory stressors. We use the case of Latina/o immigrant youth who transitioned from undocumented legal status to temporarily protected status under the Deferred Action for Childhood Arrivals (DACA) program. Analyses of representative California statewide survey data from 2007 to 2018, combined with surveys and in-depth interviews with DACA recipients, suggest that without full social and structural inclusion, legal transitions that expand rights will produce short-term psychological benefits that do not hold up over time.

Status Variation in Anticipatory Stressors and Their Associations with Depressive Symptoms.

Members of structurally disadvantaged social groups report more frequent exposure to a variety of negative life events and chronic strains, yet little research has examined whether similar patterns exist for anticipatory stressors, or challenging circumstances that loom as potential threats in the future. This study uses data collected as part of a national survey of college seniors (N = 995) to examine how anticipatory stress regarding economic and residential security, exposure to traumatic events, and experiences of discrimination vary by gender identity, race-ethnicity, sexual orientation, and first-generation college student status. Consistent with stress theory, anticipatory stressors are more commonly reported by members of disadvantaged groups. Notably, variation in anticipatory stressors explains a nontrivial proportion of differences in depressive symptoms found across gender identity and sexual orientation categories. Findings signal the necessity of incorporating anticipatory stressors into research in the stress paradigm to further disentangle the contributions of social stressors to health disparities.

Striving While Black: Race and the Psychophysiology of Goal Pursuit

Population health scientists have largely overlooked anticipatory stressors and how different groups of people experience and cope with anticipatory stress. I address these gaps by examining black-white differences in the associations between an important anticipatory stressor-goal-striving stress (GSS)-and several measures of psychophysiology. Hypotheses focusing on racial differences in GSS and psychophysiology are tested using self-report and biomarker data from the Nashville Stress and Health Study (2011-2014), a cross-sectional probability survey of black and white working-age adults from Davidson County, Tennessee (n = 1,252). Compared to their white peers, blacks with higher GSS report greater self-esteem and fewer symptoms of depression and anxiety. However, increased GSS also predicts elevated levels of high-effort coping (i.e., John Henryism), neuroendocrine stress hormones, and blood pressure for blacks but not whites. I discuss the implications of these findings for scholars interested in the stress process and broader black-white health inequalities in the United States.

Female Volleyball Players Are More Prone to Cortisol Anticipatory Stress Response than Sedentary Women.

Background and Objectives: Top-level sports performance places heavy physical and psychological demands on elite-level athletes, which can be a source of increased levels of stress. Therefore, high-level volleyball players may present altered cardiovascular and endocrinological stress response during stressful events. Although many previous studies have examined the response to stress on athletes, most of them regarded only males, while the impact of the female menstrual cycle has rarely been taken into account. We aimed to study psychophysiological response to anticipatory stressor through analysis of heart rate, self-reported anxiety level, and salivary cortisol in healthy young female athletes by minimalizing the effect of confounders. Materials and Methods: A total of 55 females (25 members of the best league for female volleyball players in Poland and 30 sedentary-lifestyle control subjects) in the follicular phase of their menstrual cycle were exposed to mental arithmetic tasks as an experimental imitation of the stressor. Volleyball players were significantly taller than sedentary individuals (177.1 ± 3.4 cm vs. 173.3 ± 3.4 cm, respectively, p = 0.034), but did not differ in weight (73.6 ± 5.2 kg vs. 70 ± 4.23 kg, respectively, p = 0.081), body mass index (BMI) (23.5 ± 1.13 vs. 24.1 ± 1.45, respectively, p = 0.060), and age (22 ± 1.11 vs. 23 ± 1.14 years, respectively, p = 0.2). Their stress responses were assessed through self-reported anxiety levels and physiological measurements of salivary cortisol concentrations and heart rate (HR). Results: For HR, significant effects of time (F(2,120) = 21.34, p < 0.001, η2 = 0.26) were found, but not for training status (F(1,60) = 2.69, p = 0.106, η2 = 0.04). For cortisol levels, the analysis showed the main effects of time (F(3,180) = 11.73, p < 0.001, η2 = 0.16) and training status (F(1,60) = 4.69, p = 0.034, η2 = 0.07) and a significant interaction between training status and time (F(3,180) = 3.07, p = 0.029, η2 = 0.05). Post-hoc analyses showed higher cortisol concentrations among volleyball players following the math task (all p < 0.001), as well as higher cortisol concentrations in S2, S3, and S4 compared to S1 in volleyball players (all p < 0.001). We observed also a significant increase in state anxiety in both groups (all p < 0.001), but no differences in state anxiety levels between groups. Conclusion: Female volleyball players may not differ in subjective graduation of stressors; however, exposure to training-based stressors seems to promote cortisol response to the anticipated stressor.

Living a Deportation Threat: Anticipatory Stressors Confronted by Undocumented Mexican Immigrant Women

Previous sociological research shows that exposure to stress varies by individuals’ social statuses and is a central mechanism in producing mental health disparities. This line of research suggests that ethnoracial groups are more exposed to racial discrimination, thus negatively impacting their mental health. There has also been a growing literature showing how legal status impacts the mental health of immigrants and their families. However, the sociology of mental health and migration literature has largely remained disparate. This paper bridges these literatures to highlight how living a deportation threat manifests itself as an anticipatory stressor that negatively impacts undocumented Mexican migrant women’s access to resources, social relationships, and social roles. Based on 30 semi-structured in-depth interviews with undocumented Mexican immigrant women from Houston, Texas, my findings reveal living a deportation threat is a perpetual anticipatory stressor that intensifies the effects of avoiding authorities, family fragmentation, and economic uncertainty. I argue this anticipatory stressor transforms into a chronic stressor that undocumented Mexican women confront daily. By situating this study within an anti-immigrant social context, it highlights the social processes and mechanisms that exacerbate the stressors undocumented Mexican immigrant women confront.

Anticipatory Minority Stressors among Same-sex Couples: A Relationship Timeline Approach.

The authors build on previous stress theories by drawing attention to the concept of anticipatory couple-level minority stressors (i.e., stressors expected to occur in the future that emanate from the stigmatization of certain relationship forms). A focus on anticipatory couple-level minority stressors brings with it the potential for important insight into vulnerabilities and resiliencies of people in same-sex relationships, the focus of this study. The authors use relationship timelines to examine stressors among a diverse sample of same-sex couples (n = 120). Respondents in same-sex relationships anticipated stressors that are likely not unique to same-sex couples (e.g., purchasing a home together) but labeled many of these anticipatory stressors as reflecting the stigmatization of their same-sex relationship. Respondents rated anticipatory minority stressors as more stressful than other anticipatory stressors. Moreover, stressors varied by gender, age, and relationship duration although not race/ethnicity or geographic site. This analysis is a preliminary step in examining how unique anticipatory couple-level minority stressors function as determinants of relationship quality, mental and physical health, and health disparities faced by sexual minority populations. Attempts to understand current stress levels should consider anticipatory stressors alongside past and current life events, chronic strains, daily hassles, and minority stressors, as these processes are impossible to disentangle and may be consequential for current well-being.

Work–Family Conflict, Job Insecurity, and Health Outcomes Among US Workers

Previous scholarship has highlighted how work–family conflict (work-to-family conflict and family-to-work conflict) and job insecurity interfere with health outcomes. Little work, however, considers how these stressors jointly influence health among workers. Informed by the stress process model, the current study examines whether job insecurity moderates the relationships between work-to-family conflict and family-to-work conflict and two health outcomes: self-reported physical health and poor mental health. The analyses also consider whether a greater moderating role is played by work-to-family conflict or family-to-work conflict. Using data from the 2008 National Study of the Changing Workforce, we also examine if patterns diverge by gender. Our results show that work-to-family conflict and family-to-work conflict have direct effects on poor mental and physical health. Additionally, we find that the negative effect of work-to-family conflict on poor mental and physical health is stronger for those with job insecurity, while no such relationship was found for family-to-work conflict. We found no evidence of significant gender differences in how these relationships operate. Overall, we contribute to the literature by testing the combined effects of both forms of work–family conflict and job insecurity on poor mental and physical health. We also deepen the understanding of the stress process model by highlighting the salience of the anticipatory stressor of job insecurity.

Effect of anticipatory stress on placebo alcohol consumption in a bar laboratory

ABSTRACTBackground: Only one laboratory study has examined the relation between stress and alcohol use in an ecologically valid drinking context. In that prior study, drinking was measured after the stressful situation. Objective: To examine the effect of an anticipatory stressor, and trait social anxiety on “alcohol” consumption in a bar laboratory. Methods: College students aged 18 and older (N = 127) in same-sex groups of two or three participants took part in a study that ostensibly examined alcohol’s effect on language fluency. Using a between-subjects design, participants were randomly assigned to a stress or control condition. Participants in the stress condition anticipated giving a stressful speech for the fluency procedure, whereas those in the control group anticipated a nonstressful activity. Before the alleged fluency task, groups could order and consume mixed drinks ad lib in a bar laboratory. No beverages actually contained alcohol, but we used a validated procedure to ensure that participants included in these analyses were deceived. Primary analyses were performed with a hierarchical linear model (HLM) due to a substantial group/modeling effect. Results: Counter to expectations, participants in the control group consumed more placebo alcohol than those in the stress condition. This main effect was moderated by past 3 months’ drinks per week, such that the effect was attenuated (or reversed) among heavy drinkers. No main or interaction effects were observed for trait social anxiety. Conclusions: Some stressors (i.e., those invoking performance anxiety) may decrease consumption. People with higher levels of alcohol involvement might be especially motivated to drink for tension reduction purposes.

Reality as the leading cause of stress: rethinking the impact of chronic stress in nature

SummaryChronic activation of the stress axis caused by long‐term uncontrollable and unpredictable factors in the environment has been regarded as causing maladaptive and/or pathological effects, both by those studying animals in the laboratory and in nature. While pathology may apply to the former, I argue that it does not apply to the latter.Our thinking on the role of chronic stress in animals in nature has been heavily influenced by biomedical research, but much less so by the ecological and evolutionary context within which animals actually function. I argue that when such stressors occur (e.g. periods of high predation risk, food limitation, prolonged severe weather, social conflict, etc.), although the animal may be chronically stressed, its responses are adaptive and continue to promote fitness.Chronic stressors in nature can be subdivided into whether they are reactive (direct physiological challenges threatening homeostasis and not requiring cognitive processing – for example, food limitation) or anticipatory (perceived to be threatening and requiring cognitive processing – for example, high predation risk). For anticipatory stressors, their impact on the animal should not be based on their absolute duration (they may be acute), but rather by the duration of their physiological consequences.The anticipatory stressor of persistent high predation risk does not elicit chronic stress in all prey classes. Cyclic snowshoe hare and arctic ground squirrels exhibit evidence of chronic stress when predator numbers are high, but cyclic vole and noncyclic elk populations do not. I suggest that chronic stress has evolved to benefit the fitness of the former and not the later, with the key factors being lifespan and life history. I propose that chronic stress evolves in a species only if it is adaptive.