Workplace Stress and Occupational Health Interventions

Occupational stress: theoretical models and their evidence base

Occupational stress represents one of the most extensively researched topics in work psychology, with implications for employee health and wellbeing, organisational performance, and the significant costs associated with work-related illness and absence. The UK Health and Safety Executive (HSE, 2022) estimates that work-related stress, anxiety, and depression accounted for 17 million working days lost in the 2021-22 period, representing the leading cause of work-related illness in the United Kingdom. Karasek's (1979) demand-control model remains the most cited theoretical framework in occupational stress research. The model proposes that psychological strain arises from the combination of high job demands, conceptualised as workload and time pressure, and low job control, operationalised as the degree of discretion and autonomy the worker has in determining how work is done. A meta-analysis by Kivimaki et al. (2012), drawing on individual-level data from over 200,000 workers, confirmed that high job strain significantly elevated the risk of coronary heart disease after adjustment for standard cardiovascular risk factors.

Karasek and Theorell (1990) extended the model to incorporate social support as a third dimension, proposing that iso-strain jobs, characterised by high demands, low control, and low social support, pose the greatest risk to worker health.

Effort-reward imbalance and psychosocial working conditions

Siegrist's (1996) effort-reward imbalance model proposes that occupational stress arises from the perceived imbalance between the effort expended in work and the rewards received for that effort, including pay, esteem, and career stability. Unlike the demand-control model, the effort-reward imbalance model incorporates the broader reciprocity relationship between the worker and the employing organisation, recognising that the subjective sense of fairness in this exchange is a powerful determinant of psychological wellbeing. Stansfeld and Candy (2006) conducted a systematic review of prospective studies of psychosocial working conditions and mental health outcomes, identifying job control, social support at work, and job insecurity as the most consistently supported predictors of incident depression and common mental disorder. The growth of zero-hours contracts, temporary employment, and platform-based gig work has expanded the population exposed to job insecurity as a chronic occupational stressor, raising important questions about the adequacy of current regulatory frameworks for protecting worker wellbeing in the context of changing employment models (De Witte, 2005).

Organisational interventions and their effectiveness

The most extensively researched organisational interventions for occupational stress fall into two categories: primary interventions that address the sources of stress in working conditions, and secondary and tertiary interventions that build individual coping resources or provide treatment for stress-related disorders. The evidence base suggests that primary interventions, which target job demands, job control, social support, and effort-reward imbalance directly, produce more robust and durable improvements in employee wellbeing than interventions that focus exclusively on building individual resilience in the face of unchanged working conditions (LaMontagne et al., 2007). The Management Standards for Work-Related Stress, developed by the HSE, identify six key areas of work design: demands, control, support, relationships, role, and change, and specify the standards of working conditions that employers should aim to achieve in each area.

Conclusion

The theoretical and empirical literature on occupational stress identifies a well-established set of psychosocial working conditions that constitute significant risk factors for both physical and psychological health outcomes. The demand-control and effort-reward imbalance models provide complementary analytical frameworks that have generated substantial evidence linking workplace organisation to health outcomes, and the accumulation of prospective epidemiological evidence has strengthened the case for treating psychosocial working conditions as modifiable health determinants that require regulatory attention. Effective occupational stress prevention requires interventions at the organisational level, addressing the conditions that generate chronic stress, rather than exclusively at the individual level.

Burnout as a distinct syndrome: measurement and prevalence

Burnout, defined by Maslach and Jackson (1981) as a syndrome of emotional exhaustion, depersonalisation, and reduced personal accomplishment arising from chronic exposure to occupational stressors, is conceptually and empirically distinct from occupational stress, though the two constructs share significant antecedents. Emotional exhaustion, the core dimension of burnout, reflects the depletion of emotional resources that occurs when the demands of work consistently exceed the individual's capacity to recover between working periods. Depersonalisation, characterised by cynical and detached attitudes toward the people served through one's work, represents a psychological protective strategy through which the exhausted worker creates emotional distance from the demands of the role. The World Health Organization's recognition of burnout as an occupational phenomenon in the 11th Revision of the International Classification of Diseases (ICD-11) has given the concept regulatory and clinical significance that was previously absent, though the criteria for burnout distinguish it explicitly from a medical condition, positioning it as a factor influencing health status rather than a diagnosable disorder.