Helping people to sort it out: The role of social support in the Job Strain Model

This paper reports three studies of occupational stress investigating the role of social support as an intervening variable in the Job Strain Model (Karasek, 1979). A computer simulated mail-sorting work environment was used to assess the effect of demands, control and social support on measures of strain, satisfaction, and perceived and actual task performance. The first experiment ( N =60) tests the basic Job Strain Model by manipulating levels of task demand and control. The second experiment ( N =120) compares high and low levels of two types of social support (informational support and emotional support) to determine whether and how they interact with extreme conditions of the Job Strain Model (high strain and low strain). The final experiment ( N =90) investigates positive and negative forms of social support (praise and criticism) in relation to extreme job strain conditions. Results show that the job strain model is consistent with the stress and performance data, although stress showed no Demand ×Control interaction. Social supports increased arousal, satisfaction and perceived performance, but did not affect stress or task performance. Moreover, contrary to buffer theories, social supports did not interact with the job strain variables. Congruence between preferred and experienced emotional support levels also predicted performance.     

Testing the 3-factor model of occupational stress: the impact of demands, control and social support on a mail sorting task

This study tests a 3-factor model of occupational stress, which predicts that job demands, job control and social support influence levels of strain. In a laboratory simulation of mail sorting, task demands, control and social supports were manipulated systematically. Pre- and post-task measures of self reported stress and arousal were compared across groups. Performance was measured continuously during the computer task and all 120 participants reported their perceived performance afterwards. Stress was found to be higher and perceived performance was lower in conditions of high demand; this pattern was also observed in conditions of low social support. Contrary to the hypotheses put forward in this paper, task control did not affect stress and the manipulations did not interact to produce elevated stress. However, task performance was poorer in conditions of high demand and in conditions of low control, and there was a significant interaction between demand and control for performance. Work preference measures indicated that the level of fit between ideal and actual social support influenced stress and perceived performance.     

The moderating role of social support in Karasek's job strain model

This paper examines whether social support is a boundary-determining criterion in the job strain model of Karasek (1979). The particular focus is the extent to which different sources of social support, work overload and task control influence job satisfaction, depersonalization and supervisor assessments of work performance. Hypotheses are tested using prospective survey data from 80 clerical staff in a university setting. Results revealed 3-way interactions among levels of support (supervisor, co-worker, non-work), perceived task control and work overload on levels of work performance and employee adjustment (self-report). After controlling for levels of negative affect in all analyses, there was evidence that high levels of supervisor support mitigated against the negative effects of high strain jobs on levels of job satisfaction and reduced reported levels of depersonalization. Moreover, high levels of non-work support and co-worker support also mitigated against the negative effects of high strain jobs on levels of work performance. The results are discussed in terms of the importance of social support networks both at, and beyond, the work context.     

Testing the demand-control-support model among health-care professionals: A structural equation model

This paper reports a further empirical validation of the Demand-Control-Support Model (DCS model), which was developed by Johnson and colleagues (1988, 1989). Data were collected from a heterogeneous group of health-care professionals (nurses and nurses' aides; n = 249). Three major refinements were made to the validation of the DCS Model. First, all relationships in the model were estimated simultaneously by means of covariance structure modelling (LISREL 8). Second, the control dimension was refined substantially, using a psychometrically more sound assessment of the workers' autonomy. Third, the model was applied to the work of health-care professionals. The data did not confirm the assumption that both job strain and motivation are multiplicative functions of job demands, autonomy and social support. First, the results suggested that high levels of autonomy attenuate the increase of emotional exhaustion due to job demands. These results partially supported Karasek's Job Demand-Control Model (Karasek 1979). Second, high levels of social support proved to attenuate the increase of emotional exhaustion due to autonomy. Finally, the main effect of autonomy on job challenge implied that an increase in autonomy is accompanied by an increase in job challenge (and, consequently, job involvement). In addition, low job demands and a high amount of work-related support seem to reduce feelings of exhaustion and, consequently, health complaints.     

Testing the demand-control-support model among health-care professionals: A structural equation model

Abstract

This paper reports a further empirical validation of the Demand-Control-Support Model (DCS model), which was developed by Johnson and colleagues (1988, 1989). Data were collected from a heterogeneous group of health-care professionals (nurses and nurses' aides; n = 249). Three major refinements were made to the validation of the DCS Model. First, all relationships in the model were estimated simultaneously by means of covariance structure modelling (LISREL 8). Second, the control dimension was refined substantially, using a psychometrically more sound assessment of the workers' autonomy. Third, the model was applied to the work of health-care professionals. The data did not confirm the assumption that both job strain and motivation are multiplicative functions of job demands, autonomy and social support. First, the results suggested that high levels of autonomy attenuate the increase of emotional exhaustion due to job demands. These results partially supported Karasek's Job Demand-Control Model (Karasek 1979). Second, high levels of social support proved to attenuate the increase of emotional exhaustion due to autonomy. Finally, the main effect of autonomy on job challenge implied that an increase in autonomy is accompanied by an increase in job challenge (and, consequently, job involvement). In addition, low job demands and a high amount of work-related support seem to reduce feelings of exhaustion and, consequently, health complaints.     

Moderating effects of social support in shiftworking and non-shiftworking nurses

The effects of social support on the job stress (role ambiguity)-strain (job dissatisfaction, intent-to-turnover, health problems) relationship were investigated in shiftworking (second and third shifts) and non-shiftworking (first shift) groups of nurses (N = 191). Previous research indicates that shiftworkers frequently report problems of social integration as a negative aspect of their jobs. Additionally, shiftworkers demonstrate a number of stress-related illnesses. Social support has been hypothesized to show its strongest stress-buffering (i.e. moderating) effects in high stress environments. In other words, persons with higher levels of social support are less likely to be negatively affected by high stress environments. It was hypothesized that individuals working on shiftwork would demonstrate stronger moderating effects of social support on the job stress-strain relationship than non-shiftworkers because of the stressful nature of shiftwork and the importance of social integration difficulties to shiftworkers. The dependent measures used in the analyses were global job satisfaction, intent-to-quit, and perceived health problems. Main and moderating effects of social support were found for several of the analyses. For shiftworkers, this buffering effect was significantly greater for supervisor social support on global job satisfaction and intent-to-quit. Implications of the findings are discussed.     

Role stress among Canadian white-collar workers

The incidence of various stressors at work and outside work was examined in a group of public service workers with a large Canadian federal government department. Workers were either in clerical, technical and supervisory ('officers'), or management positions. Measures of work stress included role stressors (load, insufficiency, conflict ambiguity and responsibility), as well as stress due to the physical environment. Both life events and daily hassles were included as measures of non-work stress. The consequences of stress were considered in terms of vocational, psychological, interpersonal, and physical strain, as well as in terms of job satisfaction and organizational commitment. Potential moderators of stress included social support and self-esteem. Among work stressors conflict, ambiguity and insufficiency were the more closely associated with vocational outcomes. MANCOVA followed by discriminant function analysis showed that clerical workers were distinguished by higher levels of insufficiency, officers by higher levels of conflict and the lowest levels of job satisfaction and organizational commitment, and managers by higher levels of perceived responsibility for others. The results are discussed in terms of social role theory.     

Job stress, social support, job satisfaction and absenteeism among offshore oil personnel

The major aim of this study was to examine how job stress in the offshore working environment may affect workers experience of strain. This study also analyses both the main and moderator effect of social support on the association between job stress and strain. The association between strain and absenteeism is also analysed. The analyses are based on a self-completion questionnaire survey among employees on offshore oil installations in the Norwegian part of the North Sea (n = 1137). The data collection was carried out in 1994. A similar study was conducted in 1990. Job stress was found to be associated with job dissatisfaction, as well as experience of strain. Social support from a supervisor had a main effect on strain. Some evidence of the moderating effects of social support were found. The employees who had been absent from work experienced most strain. It is concluded that job stress predicted job dissatisfaction and strain. In turn, strain and absenteeism were associated with each other. These results suggest that improving organizational and social factors should be the focal area in health promotion in the offshore oil industry.     

Human resource development,organization development,organizational learning,and organizational effectiveness: all needed more than ever

In this study the Job Demand-Control model was used to study the quality of working life of Dutch secondary teachers. The Job Demand-Control model of Karasek is a theoretical model in which stress and learning are both considered as dependent variables which are influenced by three different task characteristics: job demands, job control, and social support. This model was tested for Dutch secondary teachers (n = 542). Results shed light on the relationship between stress and learning, on the one hand, and the effects of task characteristics on work stress and on work-based learning, on the other hand. It is concluded that the relationship between stress and learning is mediated by the amount of job control as the model predicts. However, the results also reveal that the Karasek model is better suited for explaining stress than for explaining learning. To explain work-based learning variables other than task characteristics have to be taken into account.     

ENOP: Organizational issues in hospitals

Abstract

The major aim of this study was to examine how job stress in the offshore working environment may affect workers experience of strain. This study also analyses both the main and moderator effect of social support on the association between job stress and strain. The association between strain and absenteeism is also analysed. The analyses are based on a self-completion questionnaire survey among employees on offshore oil installations in the Norwegian part of the North Sea (n = 1137). The data collection was carried out in 1994. A similar study was conducted in 1990. Job stress was found to be associated with job dissatisfaction, as well as experience of strain. Social support from a supervisor had a main effect on strain. Some evidence of the moderating effects of social support were found. The employees who had been absent from work experienced most strain. It is concluded that job stress predicted job dissatisfaction and strain. In turn, strain and absenteeism were associated with each other. These results suggest that improving organizational and social factors should be the focal area in health promotion in the offshore oil industry.     

The Role of Social Support in Coping during the Anticipatory Stage of Organizational Change: A Test of an Integrative Model

Few researchers have explored how employees use social support to cope during organizational change. The current research proposed and tested a model that integrates moderation and mediation effects in order to understand how perceived available support influences employees' use of support mobilization to deal with change‐related stress. Survey data were collected from 476 health professionals working in a large public hospital undergoing large‐scale change and downsizing. Moderated path analyses revealed evidence to suggest that perceived available support plays a moderated mediation role during coping with change. Support mobilization mediated the indirect relationship between change‐related stress and job satisfaction, at both low and high levels of perceived available colleague support. Perceived available non‐work support moderated the relationship between support mobilization and job satisfaction, and perceived available supervisor support moderated the relationship between change‐related stress and support mobilization. The direction of simple effects was not always as expected and alternative explanations for these unexpected findings are offered, along with practical implications for supervisors managing organizational change.     

The Contingent Effects of Role Ambiguity and Role Novelty on Expatriates' Work‐related Outcomes

Research on work stress has highlighted its negative outcomes for both individuals and their employers. Overseas assignments are more stressful than domestic assignments, and their relatively high failure rates are well documented. We suggest, however, that certain types of stress can positively affect expatriate performance. Based on role theory and the distinction between hindrance and challenge stressors, we develop hypotheses regarding the influence of role ambiguity and role novelty on expatriate success. We also conceptualize and empirically investigate the moderating influence of expatriates' perceptions of organizational support and supervisor support. Our hypotheses are tested using a sample of 125 Japanese expatriate managers in Germany. We find that role ambiguity is a hindrance stressor and negatively affects job satisfaction and work adjustment, while role novelty acts as a challenge stressor and positively affects job satisfaction, task performance and work adjustment. Our findings also show that perceived organizational support attenuates the negative effects of role ambiguity on work adjustment and strengthens the positive effect of role novelty on job satisfaction. We also find that supervisor support positively moderates the positive effect of role novelty on job satisfaction and work adjustment.     

Mastery-approach and mastery-avoidance goals and their relation with exhaustion and engagement at work: The roles of emotional and instrumental support

The results of two cross-sectional studies (N = 220 and N = 258) indicate that employees' work-related mastery-approach goals (i.e. the striving to improve one's performance at work) were positively associated with work engagement. Further, this relationship is explained by high levels of instrumental support. In contrast, employees' work-related mastery-avoidance goals (i.e. the striving to avoid performing worse than one aspires to) are positive predictors of job detachment and fatigue. The relationships between mastery-avoidance goals and these detrimental work outcomes are explained by low levels of perceived emotional support. Altogether, these results suggest that workers with mastery-approach goals tend to invest in their social work environment by establishing instrumental exchange relationships. Such relationships are considered functional for task performance and explain the positive relationship with work engagement. Employees who hold mastery-avoidance goals, on the other hand, tend to withdraw from the social structure of the workplace which explains the negative relationship with emotional support. In turn, given the lack of emotional support, psychological detachment and fatigue may emerge. These results are discussed in relation to the surging interest in the social mechanisms that result from the pursuit of achievement goals.     

The Job Demand-Control (-Support) Model and psychological well-being: A review of 20 years of empirical research

The Job Demand-Control (JDC) model (Karasek, 1979) and the Job Demand-Control-Support (JDCS) model (Johnson, and Hall, 1988) have dominated research on occupational stress in the last 20 years. This detailed narrative review focuses on the JDC(S) model in relation to psychological well-being. It covers research from 63 samples, published in the period 1979-1997. In the review a distinction is drawn between two different hypotheses prevailing in research on the models. According to the strain hypothesis of the JDC model, employees working in a high-strain job (high demands-low control) experience the lowest well-being. The buffer hypothesis states that control can moderate the negative effects of high demands on well-being. Translating these hypotheses to the expanded JDCS model, the iso-strain hypothesis predicts the most negative outcomes among workers in an iso-strain job (high demands-low control-low social support/isolation), whereas the buffer hypothesis states that social support can moderate the negative impact of high strain on well-being. Although the literature gives considerable support for the strain and iso-strain hypotheses, support for the moderating influence of job control and social support is less consistent. The conceptualization of demands and control is a key factor in discriminating supportive from nonsupportive studies. Only aspects of job control that correspond to the specific demands of a given job moderate the impact of high demands on well-being. Furthermore, certain subpopulations appear to be more vulnerable to high (iso)strain, whereas others benefit more from high control. On the basis of the results of this review, suggestions for future research and theoretical development are formulated.     

The Job Demand-Control (-Support) Model and psychological well-being: a review of 20 years of empirical research

The Job Demand-Control (JDC) model (Karasek, 1979) and the Job Demand-Control-Support (JDCS) model (Johnson, and Hall, 1988) have dominated research on occupational stress in the last 20 years. This detailed narrative review focuses on the JDC(S) model in relation to psychological well-being. It covers research from 63 samples, published in the period 1979-1997. In the review a distinction is drawn between two different hypotheses prevailing in research on the models. According to the strain hypothesis of the JDC model, employees working in a high-strain job (high demands-low control) experience the lowest well-being. The buffer hypothesis states that control can moderate the negative effects of high demands on well-being. Translating these hypotheses to the expanded JDCS model, the iso-strain hypothesis predicts the most negative outcomes among workers in an iso-strain job (high demands-low control-low social support/isolation), whereas the buffer hypothesis states that social support can moderate the negative impact of high strain on well-being. Although the literature gives considerable support for the strain and iso-strain hypotheses, support for the moderating influence of job control and social support is less consistent. The conceptualization of demands and control is a key factor in discriminating supportive from nonsupportive studies. Only aspects of job control that correspond to the specific demands of a given job moderate the impact of high demands on well-being. Furthermore, certain subpopulations appear to be more vulnerable to high (iso)strain, whereas others benefit more from high control. On the basis of the results of this review, suggestions for future research and theoretical development are formulated.     

The Consequences of Perceived Age Discrimination Amongst Older Police Officers: Is Social Support a Buffer?*

This paper considers the psychological consequences of perceived age discrimination, and the buffering effect of social support. Findings suggest that age discrimination acts as a stressor, with negative effects on job and life satisfaction, perceived power and prestige of the job, and affective and normative commitment, along with positive effects on withdrawal cognitions and continuance commitment. For work‐based social support, there were positive main effects on job and life satisfaction, power and prestige of the job, and affective and normative commitment, and a negative main effect on withdrawal cognitions. However, there were no significant moderating effects for work‐based social support, and we found the anticipated buffering effect for non‐work‐based social support only for life satisfaction, with reverse buffering for job satisfaction and normative commitment     

The impact of sense of coherence and high-demand/low-control job environment on self-reported health, burnout and psychophysiological stress indicators

Sense of Coherence (SOC) is a new concept belonging to a salutogenic paradigm, proposing to explain health as contrasted to disease, a pathogenic paradigm. The Job Demand-Control (JDC) model of job stress suggests that the combination of high job demands and low job control, defined as job strain, is strongly associated with adverse health consequences. The aim of this study was to evaluate the relationship between SOC and the JDC model in assessment of negative job effects within three pathogenically defined contexts: self-reported health, burnout and psychophysiological stress indicators, assessing the explanatory value of SOC for such variables. The study was conducted with 103 employees of social-welfare and social-insurance agencies in Sweden. A questionnaire related to job conditions, health and burnout was administered, and blood samples were collected and analysed for serum concentrations of cortisol, prolactin and immunoglobulin G. Multiple-regression models were calculated including variables from all three contexts. In the analyses, a distinction was made between emotional job strain and quantitative job strain. The SOC interacted with emotional job strain, but the interaction also increased the independent effect of emotional job strain. The independent effect of SOC disappeared in most models when interaction was included. It is concluded that studies of job strain-effects according to the JDC model should include the SOC as an interaction factor.     

The impact of sense of coherence and high-demand/low-control job environment on self-reported health,burnout and psychophysiological stress indicators

Sense of Coherence (SOC) is a new concept belonging to a salutogenic paradigm, proposing to explain health as contrasted to disease, a pathogenic paradigm. The Job Demand-Control (JDC) model of job stress suggests that the combination of high job demands and low job control, defined as job strain, is strongly associated with adverse health consequences. The aim of this study was to evaluate the relationship between SOC and the JDC model in assessment of negative job effects within three pathogenically defined contexts: self-reported health, burnout and psychophysiological stress indicators, assessing the explanatory value of SOC for such variables. The study was conducted with 103 employees of social-welfare and social-insurance agencies in Sweden. A questionnaire related to job conditions, health and burnout was administered, and blood samples were collected and analysed for serum concentrations of cortisol, prolactin and immunoglobulin G. Multiple-regression models were calculated including variables from all three contexts. In the analyses, a distinction was made between emotional job strain and quantitative job strain. The SOC interacted with emotional job strain, but the interaction also increased the independent effect of emotional job strain. The independent effect of SOC disappeared in most models when interaction was included. It is concluded that studies of job strain-effects according to the JDC model should include the SOC as an interaction factor.     

Job resources and emotional exhaustion: The mediating role of learning opportunities

The Job Demands-Resources model predicts that job demands increase and job resources decrease emotional exhaustion in employees. In this study, we investigated one possible mechanism for this, in order to provide a deeper insight into the role of job resources in this energy-depletion process. We assumed that job resources (autonomy and task variety) reduce emotional exhaustion through the promotion of opportunities for personal growth and development, especially workplace learning. Moreover, we expected that job demands (workload, cognitive and emotional demands) would be positively related to work-related learning opportunities. Our research model was tested in a large and heterogeneous sample out of the Dutch working population (N = 4589), following a cross-validation procedure. Multi-group structural equation modelling revealed that autonomy and task variety promoted learning opportunities, which in turn partially mediated between these job resources and emotional exhaustion. With respect to job demands, our study showed mixed results: cognitive demands promoted learning opportunities, workload frustrated such opportunities, and emotional demands were not significantly related to learning opportunities. Our results contribute to a better understanding of the interplay between job demands, job resources and learning opportunities in the energy-depletion process, and support the need for the promotion of learning opportunities in the workplace.     

Interactive effects of perceived control and job stressors on affective reactions and health outcomes for clerical workers

Karasek's (1979) hypothesis that perceived control interacts with various job stressors in affecting employee satisfaction and health was tested. It was proposed that high levels of perceived stress would only be associated with poor health and negative affect in the presence of low control. One hundred and thirty-six clerical workers at a major US university completed questionnaries containing the measures of interest. The results of regression analyses failed to support the interaction hypothesis. However, measures related to both control and job stressors were found to correlate with satisfaction and health outcomes, as has been found in prior research. Limitations of the self-report and correlational methodology are discussed.