Mediators and moderators of the stressor-fatigue relationship in nonclinical samples

High-speed train drivers' human error under fatigue and stress: the role of situation awareness and individual differences

Fatigue and stress are critical variables that impair railway train drivers' safety performance, and individual differences may influence these effects. This study investigates how fatigue and stress affect high-speed train drivers' human error and the role of individual differences. We hypothesised that situation awareness (SA) mediates the effects of fatigue and stress on human error, and individual differences (age and work experience) moderate these effects. We surveyed 1,391 male drivers from eight Chinese railway bureaus and used PROCESS Macro for data analysis. The results revealed that fatigue and stress increased human error, directly and indirectly through SA. Age and work experience moderated the effect of fatigue and stress on SA, respectively. Older drivers had better SA under high fatigue, while more experienced drivers had better SA under high stress. These findings can inform more tailored safety management strategies to lower human error and enhance the safety of high-speed train operations.

Exploring life stressors, depression, and coping strategies in college students

Objective: College students experience a variety of stressors that can increase the risk for mental health concerns, like depression. It is crucial for practitioners working on college campuses to understand the relationship among stressful life events, depression, and coping strategies. The purpose of this study was to explore life stressors' impact on reported depressive symptoms and how adaptive and maladaptive coping strategies moderate that relationship in college students. Participants: Data was used from a comprehensive health behavior survey. Participants included 969 college students. Methods: Multivariable logistic models were used to examine the association between stressful events, depression, and coping strategies. Results: Results from multiple logistic regression analyses indicated that college students who experienced life stressors and participated in more negative than positive coping strategies were 2.49 (95% CI = 1.34, 4.63) times more likely to experience depression. Conclusions: Implications and creative interventions are provided for mental health practitioners working on college campuses.

Stressful Life Events and Chronic Fatigue Among Chinese Government Employees: A Population-Based Cohort Study

Background

Currently, evidence on the role of stressful life events in fatigue among the Chinese working adults is lacking. This study aimed at exploring the prospective associations between stressful life events and chronic fatigue among Chinese government employees.

Methods

From January 2018 to December 2019, a total of 16206 government employees were included at baseline and they were followed-up until May 2021. A digital self-reported questionnaire platform was established to collect information on participants' health and covariates. Life events were assessed by the Life Events Scale (LES), fatigue was assessed by using a single item, measuring the frequency of its occurrence. Binary logistic regression analysis was used for the data analysis.

Results

Of the included 16206 Chinese government employees at baseline, 60.45% reported that they experienced negative stressful life events and 43.87% reported that they experienced positive stressful life events over the past year. Fatigue was reported by 7.74% of the sample at baseline and 8.19% at follow-up. Cumulative number of life events at baseline, and cumulative life events severity score at baseline were positively associated with self-reported fatigue at follow up, respectively. After adjusting sociodemographic factors, occupational factors and health behavior related factors, negative life events at baseline (OR: 2.06, 95% CI: 1.69–2.51) were significantly associated with self-reported fatigue at follow-up. Some specific life events including events related to work and events related to economic problems were significantly associated with self-reported fatigue. Specifically, work stress (OR = 1.76, 95%CI: 1.45–2.13), as well as not satisfied with the current job (OR = 1.95, 95%CI: 1.58–2.40), in debt (OR = 1.75, 95%CI: 1.40–2.17) were significantly associated with self-reported fatigue. The economic situation has improved significantly (OR = 0.62, 95%CI: 0.46–0.85) at baseline was significantly associated with lower incidence of self-reported fatigue.

Conclusion

Negative stressful life events were associated with fatigue among Chinese government employees. Effective interventions should be provided to employees who have experienced negative stressful life events.

Anxiety Sensitivity and Fatigue Severity Among Adults with Chronic Low Back Pain

BACKGROUND

The combined impact of chronic low back pain (CLBP) and fatigue severity is associated with increased burden and worsened symptoms. Understanding factors that may contribute to and maintain fatigue severity among individuals with CLBP is needed to isolate intervention modalities.

METHODS

The current study sought to investigate the role of anxiety sensitivity (AS) in terms of fatigue severity among 1,663 adults (70.0% female, M _age = 44.5 years, SD = 11.87) with current mild to severe CLBP as well as a subset of the sample with clinically significant fatigue (n = 778).

RESULTS

Results indicated AS was a positively and statistically significant predictor of fatigue severity among the entire sample and the subset of the sample with clinically significant fatigue.

CONCLUSIONS

These cross-sectional data highlight the potential promise of AS as an underrecognized cognitive vulnerability for greater fatigue severity among those with CLBP.

Occupational Fatigue: Relationship With Personality Traits and Decent Work

Psychology of working theory (PWT) and psychology of working framework (PWF) offered a psychological view of decent work. The present study examined the associations among personality traits, decent work and Occupational Fatigue Exhaustion Recovery Scale (OFER). Two hundred and thirty four participants filled out the Big Five Questionnaire, the Italian version of the Decent Work Scale, and the Italian version of the OFER Scale. Hierarchical regressions showed that decent work explained incremental variance beyond personality traits with respect to OFER both considering total score and its three dimensions (chronic fatigue, acute fatigue, persistent fatigue). The present study underlined the value of decent work in relation to occupational fatigue beyond the contributions of personality, in particular in relation to the dimensions of Adequate compensation and Free time and rest for less occupational fatigue (both as total and as dimensions).

Physical activity, emotional state and socialization in the elderly: study protocol for a clinical multicentre randomized trial

OBJECTIVE

To evaluate whether a 4-month physical activity (PA) group program and visits to sociocultural organizations improve emotional state, social support levels and health-related quality of life in elderly individuals with depression and/or anxiety and/or loneliness.

METHODS

This will be a multicentre, randomized, two-group clinical trial with a 1-year follow-up. Participants will be 150 primary care patients aged >64 years allocated equally to a control group and an intervention group. Inclusion criteria are Beck Depression Inventory (BDI-II) score ≥14 and/or General Anxiety Disorder (GAD-7) scale score ≥10 and/or Duke-UNC-11 scale score ≥32. The intervention group will participate in a 4-month group PA program. The program will comprise two walks per week and a monthly visit to a sociocultural facility.

RESULTS

Measured outcomes are clinical remission of depression (BDI-II score <14) and anxiety (GAD-7 scale score <10), improved social support (reduction in DUKE-UNC-11 score), improved quality of life and/or response to the intervention at 4 and 12 months post-intervention. Intervention satisfaction and adherence and post-intervention links with sociocultural organizations will also be assessed.

CONCLUSION

The findings could encourage the provision of activity-based community interventions for older individuals.

Time in Nature Associated with Decreased Fatigue in UK Truck Drivers

Heavy goods vehicle (HGV) driving is recognised as a highly hazardous occupation due to the long periods of sedentary behaviour, low levels of physical activity and unhealthy food options when working. These risk factors combine with shift work and concomitant irregular sleep patterns to increase the prevalence of fatigue. Fatigue is closely linked with stress and, subsequently, poor physiological and psychological health. In parallel, a wealth of evidence has demonstrated the health and wellbeing benefits of spending time in nature. Here, we sought to examine whether spending time in nature was associated with lower levels of fatigue, anxiety and depression in HGV drivers. 89 long-distance drivers (98.9% male, mean ± SD age: 51.0 ± 9 years, body mass index: 29.8 ± 4.7 kg/m²) participating in a wider health promotion programme reported time spent in nature (during and before the Covid-19 pandemic) and symptoms of occupational fatigue, depression and anxiety. After controlling for covariates, truck drivers who visited nature at least once a week exhibited 16% less chronic fatigue prior to the pandemic, and 23% less chronic fatigue and 20% less acute fatigue during the pandemic. No significant differences were observed for either anxiety or depression. As fatigue has a range of physical and mental health sequelae, we propose that increased exposure to natural settings may make a valuable contribution to interventions to promote the health and wellbeing of this underserved group.

The Role of Anxiety Sensitivity in terms of Weight-related Impairment and Fatigue Severity among Adults with Obesity and Chronic Low Back Pain

BACKGROUND

Obesity and chronic low back pain often co-occur and are associated with psychosocial and physical impairments such as weight-related impairment and fatigue. Yet, there is little understanding of psychological factors that may be associated with weight-related impairment and fatigue (a psychosocial factor) among this vulnerable population.

METHODS

Thus, the current study examined the role of anxiety sensitivity as it relates to self-reported weight-related impairment and fatigue severity among persons with obesity and chronic low back pain. Participants included a nationally representative sample of adults (N = 616) with co-occurring obesity and chronic low back pain (77.3% female, M age = 45.9 years, SD = 11.53).

RESULTS

Results revealed that anxiety sensitivity was associated with greater levels of weight-related impairment and fatigue severity after controlling for age, sex, body mass index (BMI), pain interference, and perceived general health.

CONCLUSIONS

The findings suggest that anxiety sensitivity may be a mechanistic target for better understanding and addressing weight-related impairment and fatigue severity among individuals with obesity and chronic low back pain.

Modeling the Effects of Stress, Anxiety, and Depression on Rumination, Sleep, and Fatigue in a Nonclinical Sample

Stress and affective distress have previously been shown to predict sleep quality, and all the factors have been shown to predict fatigue severity. However, few prior studies have examined the likely indirect mediational relationships between stress, affective distress, and sleep quality in predicting fatigue severity, and the potential role played by ruminative thinking. A short questionnaire asked 229 participants about their recent experiences of stress, affective distress, rumination, sleep, and fatigue in a community sample. High stress, anxiety, and depression were related to more ruminative thinking, which in turn was related to poor sleep quality (composed of subjective sleep quality, daytime dysfunction, sleep latency, and sleep disturbance) and poor sleep quality predicted worse fatigue. The results suggest that rumination parsimoniously explains the tendency of stress and affective distress to contribute to poor sleep quality, and together with poor sleep, it may also contribute to worse fatigue in some individuals.

Can body temperature dysregulation explain the co-occurrence between overweight/obesity, sleep impairment, late-night eating, and a sedentary lifestyle?

PURPOSE

Overweight/obesity, sleep disturbance, night eating, and a sedentary lifestyle are common co-occurring problems. There is a tendency for them to co-occur together more often than they occur alone. In some cases, there is clarity as to the time course and evolution of the phenomena. However, specific mechanism(s) that are proposed to explain a single co-occurrence cannot fully explain the more generalized tendency to develop concurrent symptoms and/or disorders after developing one of the phenomena. Nor is there a clinical theory with any utility in explaining the development of co-occurring symptoms, disorders and behaviour and the mechanism(s) by which they occur. Thus, we propose a specific mechanism-dysregulation of core body temperature (CBT) that interferes with sleep onset-to explain the development of the concurrences.

METHODS

A detailed review of the literature related to CBT and the phenomena that can alter CBT or are altered by CBT is provided.

RESULTS

Overweight/obesity, sleep disturbance and certain behaviour (e.g. late-night eating, sedentarism) were linked to elevated CBT, especially an elevated nocturnal CBT. A number of existing therapies including drugs (e.g. antidepressants), behavioural therapies (e.g. sleep restriction therapy) and bright light therapy can also reduce CBT.

CONCLUSIONS

An elevation in nocturnal CBT that interferes with sleep onset can parsimoniously explain the development and perpetuation of common co-occurring symptoms, disorders and behaviour including overweight/obesity, sleep disturbance, late-night eating, and sedentarism. Nonetheless, a significant correlation between CBT and the above symptoms, disorders and behaviour does not necessarily imply causation. Thus, statistical and methodological issues of relevance to this enquiry are discussed including the likely presence of autocorrelation.

LEVEL OF EVIDENCE

Level V, narrative review.

Basal ganglia correlates of fatigue in young adults

Although the prevalence of chronic fatigue is approximately 20% in healthy individuals, there are no studies of brain structure that elucidate the neural correlates of fatigue outside of clinical subjects. We hypothesized that fatigue without evidence of disease might be related to changes in the basal ganglia and prefrontal cortex and be implicated in fatigue with disease. We aimed to identify the white matter structures of fatigue in young subjects without disease using magnetic resonance imaging (MRI). Healthy young adults (n = 883; 489 males and 394 females) were recruited. As expected, the degrees of fatigue and motivation were associated with larger mean diffusivity (MD) in the right putamen, pallidus and caudate. Furthermore, the degree of physical activity was associated with a larger MD only in the right putamen. Accordingly, motivation was the best candidate for widespread basal ganglia, whereas physical activity might be the best candidate for the putamen. A plausible mechanism of fatigue may involve abnormal function of the motor system, as well as areas of the dopaminergic system in the basal ganglia that are associated with motivation and reward.

Evaluating the role of coping style as a moderator of fatigue and risk for future cognitive impairment in multiple sclerosis

Approximately 50% of persons with multiple sclerosis experience cognitive impairment, which adversely affects daily functioning. Although patients report that fatigue contributes to cognitive difficulties, previous empirical studies do not show a clear association. This study assessed coping style as a moderator of the relationship between fatigue and cognition in a 3-year longitudinal sample. Scores on the Fatigue Impact Scale and the Coping Orientation to Problems Experienced (COPE) at baseline were modeled to predict later performance on a composite of cognitive tests to investigate the hypothesis that coping would have a significant moderating effect on fatigue in predicting cognitive performance. Findings partially supported hypotheses by showing that avoidant coping moderated the relationship between fatigue and cognitive performance. Patients who experienced relatively high fatigue performed better on cognitive tests if they used less avoidant coping. Those who reported lower fatigue had relatively good cognitive performance regardless of their coping style. This study provides evidence that coping style is associated with the ability to deal with stress, like fatigue, and their interaction can impact functional outcomes of disease. These results could benefit understanding of prognosis and improve treatment for patients with MS.

Do sleep, stress, and illness explain daily variations in fatigue? A prospective study

OBJECTIVE

Fatigue is related to a number of serious diseases, as well as to general well-being. It is also a major cause of sickness absence and use of health facilities. Still, the determinants of variations in fatigue are little investigated. The purpose of present study was to investigate the relationships between the daily variations of fatigue with sleep during the previous night, stress or disease symptoms during the same day - across 42 consecutive days of normal life.

METHODS

50 individuals participated and gave diary reports and used an actigraph across the 42days. The data was analyzed using a multilevel approach with mixed model regression.

RESULTS

The analyses showed that the day-to-day variation in fatigue was related to (poor) sleep quality (p<.001) and (reduced) sleep duration (p<.01) the previous night, as well as to higher stress (p<.05), and to the occurrence of a cold or fever (p<.001) during the same day as the fatigue rating. Fatigue was also strongly related to poorer subjective health (p<.001) and sleepiness (p<.001) during the same day.

CONCLUSION

The results indicate that prior sleep (and sleepiness) as well as stress and illness are consistently connected to how fatigue is experienced during normal living conditions.

Control cognitions and causal attributions as predictors of fatigue severity in a community sample

Control cognitions and causal attributions of fatigue were examined in relation to Weiner's Causal Attribution theory in a community sample. Participants were 97 females and 43 males, aged 18-83 years. Weiner's dimensions of stability and uncontrollability and physical and psychosocial attributions of fatigue were related to fatigue severity. Escape-avoidance coping mediated between psychosocial causal attributions of fatigue to fatigue; whereas planful problem-solving and exercise moderated between stability cognitions to fatigue and psychosocial attributions of fatigue to fatigue, respectively. This, the cause(s) of fatigue were perceived as stable, uncontrollable, and involving physical and psychosocial factors, participants reported worse fatigue. Taken together, the results suggest that fatigue treatments may be most effective when they are tailored or matched to the belief systems of the individuals with fatigue.

The Impact of Perceived Stress, Social Support, and Home-Based Physical Activity on Mental Health among Older Adults

This study investigated how perceived stress, social support, and home-based physical activity affected older adults' fatigue, loneliness, and depression. We also explored whether social support and physical activity mediated the relationships between stress and mental health problems. The data of 163 older participants were analyzed in this study. Structural equation modeling using LISREL 8.71 was performed to assess the effects of stress, support, and physical activity on mental health. The findings indicate that perceived stress predicted higher levels of depression, social support predicted lower levels of loneliness and fatigue, and physical activity predicted lower levels of fatigue among older adults. Social support and physical activity mediated the relationships between stress and mental health, except depression. In conclusion, the relative impacts of perceived stress, social support, and physical activity on types of mental health (e.g., fatigue, loneliness, and depression) were different. Furthermore, stress had direct and indirect effects on each construct of mental health (e.g., fatigue, loneliness, and depression).

Stressful life-events and fatigue in a nonclinical sample

There is a lack of systematic examination of the relationship between different stressor features and fatigue. Thus, we examined which features of stressors (e.g. frequency, duration, severity, valence, type) were most strongly related to fatigue levels. Eighty-nine participants completed a short fatigue questionnaire and a comprehensive stress interview. High fatigue levels were found to be most strongly related to the number of acute interpersonal stressors and chronic difficulty stressors (<6 months duration) and psychological distress, but no other stressor measure. Thus, acute and chronic stressor frequency counts might be the best measures used in future studies assessing the relationship between stressors and fatigue.