Biochemical assessment and differentiation of mental and physical effort

Evaluation of mental effort under industrial conditions encounters both methodological and practical problems mainly because of lack of appropriate indices and difficulties in differentiation between body responses to physical and mental effort.

This paper presents a review of laboratory and field research from our laboratories aimed at finding objective indices for discrimination between body responses to mental and physical effort. The laboratory data show that urinary noradrenaline/adrenaline (NA/A) ratio decreases in response to mental tasks and increases in response to physical tasks. Under industrial conditions the predominating component of effort (mental or physical) evokes body response similar to that found during laboratory experiments. Re-analysis of data published in various other papers shows the same pattern of body response.

Another possible index for assessment of effort seems to be salivary cortisol which increases in response to both mental and physical tasks. Its deviations from the circadian pattern of excretion may represent a potential criterion for assessment of the emotional component of mental effort.     

The Effects of Engaging in Rapport-Building Behaviors on Productivity and Discretionary Effort

ABSTRACT

A commonly held belief among business professionals is that rapport-building activities in the workplace can enhance organizational outcomes and employee satisfaction. However, limited research has evaluated the effects of rapport-building behaviors on productivity and discretionary effort. Thus, the purpose of the current study was to examine the effects of engaging in rapport-building behaviors on productivity and discretionary effort in comparison to a control group in an analogue setting. Participants in the present study consisted of 48 undergraduate students who were assigned to either the rapport-building behaviors group or the control group. Participants completed a check-processing task to evaluate productivity and were asked to complete an optional survey to evaluate discretionary effort. The results indicated that rapport-building behaviors group had higher levels of productivity and engaged in more discretionary effort than the control group.     

Mental fatigue at work and pain perception

Abstract

The object of this study was to determine whether mental fatigue connected with high and low stimulation at work can affect the subjects' perception of pain. Two groups of female visual display unit operators were studied: the first group performed tasks involving high levels of stimulation, while the second group performed tasks involving low levels of stimulation. The results show that mental fatigue due to a high level of stimulation causes an increase in pain ratings, while the mental fatigue due to low stimulation level causes a decrease in pain ratings.     

Daily recovery from work: The role of activities,effort and pleasure

Abstract

Knowledge of the cycle of work and recovery is crucial for protecting employee health and well-being and preserving working capabilities. However, the daily process of effort and recovery is not well understood. This study investigated how the time spent on activities in the work and off-job domains, and the pleasure and effort experienced while engaging in these activities, affect the daily recovery process. We expected higher levels of effort at work and during off-job time to be negatively related to recovery, and higher levels of pleasure at work and during off-job time to be positively related to recovery. We also hypothesized that pleasure would act as a buffer against the negative effects of effort. Data were collected by means of a five-day diary study (three measurements daily, before and immediately after work, and at bedtime) among 120 university academic staff. Fatigue and (low) vigour were used as indicators of (lack of) recovery. Multilevel analyses showed that pleasure in the work and off-job domains had beneficial effects on recovery. An adverse association between effort expenditure and recovery was lacking. However, in the work domain, a combination of unpleasant and effortful work activities was negatively related to recovery. These findings stress the importance of engaging in pleasant activities during work and off-job time.     

The Role of Effort in Shifting Preference for Feedback Stimuli

ABSTRACT

Researchers have examined preference for the format of delivery of feedback, however little research has examined strategies to increase feedback and praise desirability. The current study aimed to evaluate whether preference shifted for stimuli that signaled work and for manager-praise stimuli that were delivered after work. Moreover, we sought to understand if these preference shifts were greater when the work was higher-effort compared to lower-effort work tasks (a phenomenon described in the basic literature as within-trial contrast). The study took place in a simulated work environment. Sixteen university students clicked on a shape that produced the work task, completed a mock medical data-entry task, and received manager-praise on an FR1 and FR20 schedule. At the start of the study and following each contingency exposure trials, they completed a preference assessment for both the shapes and the manager-feedback stimuli. The primary dependent variable was the percentage of preference change for two categories of stimuli – shapes presented at the beginning of trials that signaled which condition participants were in and manager-praise stimuli presented at the end of trials. Preference for the shape stimuli for both high- and low-effort stimuli decreased indicating that stimuli that signal work may become less preferred. Preference for the manager-praise stimuli for both high- and low-effort stimuli increased suggesting that stimuli that follow work may become more preferred. Overall, these data suggest that the conditions under which managers deliver feedback and praise may influence preference for those stimuli.     

Effects of experimentally induced mental and physical stress on motor unit recruitment in the trapezius muscle

Mental stress may induce muscle tension and it is thought to contribute to the development of musculoskeletal disorders. Prolonged activity of a muscle's motor units (the smallest functional units) having low activation thresholds, may cause metabolic disturbances, degenerative processes and pain. The present experiment was aimed at investigating if the same motor units are activated by mental stress as by physical demands. Seventeen participants were exposed to mental stress tests (mental arithmetic, Stroop color word) and physical demands (standardized reference contraction, force ramp contraction) in the laboratory. In addition, they were exposed to the cold pressor test. Bipolar intramuscular electromyographic (EMG) activity was measured in the trapezius muscle, which covers the upper part of the back, the neck and the shoulder, and an automatic classification programme was used to separate the contributions of the individual motor units in the compex EMG signal. Overall muscle activity was measured by bipolar surface EMG and heart rate was recorded as an indicator of stress. The mental stress induced significant increases in muscle activity ( p < .05) and in heart rate ( p < .05). In 12 out of 14 participants, one or more motor units were found to be active in mentally as well as in physically induced muscle contraction. The results indicate that mentally induced stress may contribute to keeping low threshold motor units active, even in the absence of physical demands. Considering the health risks of prolonged motor unit activity, it was concluded that lack of mental rest is an important risk factor for the development of muscular pain.     

Burnout and impaired cognitive functioning: The role of executive control in the performance of cognitive tasks

Abstract

Burnout patients often report deficits in cognitive control, and there is a need to understand the processes involved. Drawing on recent findings, we hypothesized that emotional exhaustion and task-related demands on executive control would interact in predicting performance in tasks requiring the updating and monitoring of working memory as well as the inhibition of prepotent (dominant or automatic) responses. In accordance with recent conceptualizations of burnout, we focused on emotional exhaustion as the core symptom of burnout. The sample comprised 81 employees recruited from nursing homes for elderly care in Germany, who participated in a laboratory study involving cognitive tasks. Based on a median split, participants were divided into two groups: those with high burnout and those with low burnout. In line with our hypotheses, the high exhaustion participants performed less well than those with low exhaustion only when tasks put high demands on their executive control. As predicted, high levels of emotional exhaustion were associated with more errors and longer reaction times when demands on executive control were high, whereas no performance differences were found when both tasks put low demands on executive control. The implications for practice are discussed.     

A variability taxonomy to support automation decision-making for manufacturing processes

Abstract

Although many manual operations have been replaced by automation in the manufacturing domain in various industries, skilled operators still carry out critical manual tasks such as final assembly. The business case for automation in these areas is difficult to justify due to increased complexity and costs arising out of process variabilities associated with those tasks. The lack of understanding of process variability in automation design means that industrial automation often does not realize the full benefits at the first attempt, resulting in the need to spend additional resource and time, to fully realize the potential. This article describes a taxonomy of variability when considering the automation of manufacturing processes. Three industrial case studies were analyzed to develop the proposed taxonomy. The results obtained from the taxonomy are discussed with a further case study to demonstrate its value in supporting automation decision-making.     

Job design and levels of physical and mental strain among Australian prison officers

Abstract

Over the past 15 years much has been made of the moderating influence of job discretion and support in occupations that are perceived to be high in demands. Such an effect seems to be most prevalent when subject populations are large and heterogeneous. One aim of this study was to examine the influence of subjective perceptions of these variables on strain reactions among a group of relatively homogeneous workers such as, in the present study, prison officers (n = 274). A second aim was to extend previous research and examine the joint influence of negative affectivity and perceptions of demands, discretion, and support on mental and physical well-being. It was hypothesized that those high in negative affect would be particularly strained by jobs perceived as being demanding. The hypothesized relationship between job demands, discretion and support were found to be weak and at times inconsistent. Social support, in particular, was found to have both positive and negative consequences for different aspects of well-being. Those high in negative affect were in general found to suffer lower mental well-being. More importantly, the interactive effect of negative affectivity and job demands was found to significantly predict the majority of the dependent variables used in this study. The valences of these relationships were inconsistent and are interpreted in light of Warr's (1987) vitamin model of stress.

There are several conclusions that can be drawn from the present study. Negative affectivity appears to have a truly interactive effect with job components, job demands in particular, to influence a range of variables relating to physical and mental health as well a job-related attitudes. The nature of these effects, however, suggests a dissociation in the ways that different independent variables influence a range of indices of well-being and affect. This result requires further investigation since there are important theoretical implications which will follow if the data are replicable.

In order to examine such complex effects, in addition to the need for more longitudinal studies, it is also important that standardized measures of job components are developed so that levels of stress exposure can be equated and their impact assessed across organizational settings.

Finally, the data reported in this study suggest that some effective stress management may be undertaken by adopting selection strategies which take into consideration individual characteristics. In view of the fact that individual stress management programmes are of unproven benefit (Murphy 1986, 1988) such an approach is recommended especially for those organizations which are highly constrained in the services that must be performed.     

Changes in mental well-being,blood pressure and total cholesterol levels during workplace reorganization: The impact of uncertainty

The aim of this study was to investigate the effects of uncertainty caused by large-scale workplace reorganization, on psychological well-being, blood pressure and total cholesterol levels. Employees (98 women and 86 men) were assessed four times, at approximately 6-monthly intervals, twice before and twice after reorganization. Self-reported psychological well-being was at its lowest level shortly prior to reorganization, as predicted. Greater self-reported uncertainty about one's own future occupational situation was associated with a bigger reduction in mental well-being before reorganization, as was role ambiguity after reorganization. Systolic blood pressure was elevated over initial levels just prior to reorganization, and shortly after reorganization, but at the final assessment was not significantly different from initial levels. A bigger increase in systolic blood pressure was seen in those reporting greater future job uncertainty before reorganization, and in those who started a new job or who reported greater role ambiguity after reorganization. Diastolic blood pressure was also significantly elevated over initial levels just before reorganization, but this effect became nonsignificant once changes in body mass index were statistically controlled. Total cholesterol also reached its highest level just prior to reorganization, but this effect was not significant. It is concluded that workplace reorganization caused significant increases in distress and in systolic blood pressure and that uncertainty contributed to these effects.     

Return to work among employees with mental health problems: Development and validation of a self-efficacy questionnaire

Abstract

Because of the costs to both the organization and the individual, it is important that employees who are sick-listed with mental health problems are facilitated in their return to work (RTW). In order to provide adequate interventions, it is necessary to obtain a better understanding of the RTW process of people with mental health problems. Work-related self-efficacy (SE) might play a key role within this process. This paper describes the development and validation of the return-to-work self-efficacy’ scale (RTW-SE) for employees with mental health problems. Three Dutch samples of sick-listed employees were used to validate the 11-item instrument (N=2214). Based on the factor structure and reliability results, RTW-SE was conceptualized as a unitary construct. The associations with general SE, locus of control, coping, physical workload and mental health problems support the construct validity of this scale. Most importantly, RTW-SE proved to be a robust predictor of actual return to work within three months. The encouraging preliminary psychometric properties of the scale make it a potentially valuable tool in research and in clinical practice and occupational health care settings, both before and after employees have returned to work.     

Review and reappraisal of modelling and predicting mental workload in single- and multi-task environments

The concept of mental workload has long been recognized as an important factor in individual performance within complex systems. It is documented that either overload or underload may degrade performance, and further affect the efficiency of the whole system. Therefore, systems designers need some explicit models to predict the mental workload imposed on individuals by the system at an early design phase so that alternative system designs can be evaluated. In examining mental-workload literature, it is found that few predictive mental-workload models have considered factors specific to individuals. This research aims to develop a practical framework for predicting mental workload in both single- and multi-task environments considering such individual factors. In order to describe mental workload more precisely and more completely, a framework for mentalworkload definitions, which contains instantaneous workload, average workload, accumulated workload, peak workload and overall workload, is proposed. In order to model individual factors, two new variables, i.e. effective workload and ineffective workload, are introduced to model the taskgenerated workload and individual-generated workload. The extension of the model to multi-task environments is also discussed. The proposed conceptual models are domain-independent and could be used to guide the development of operational models for different specific tasks.     

Illegitimate tasks are not created equal: Examining the effects of attributions on unreasonable and unnecessary tasks

ABSTRACT

Illegitimate tasks are tasks that violate norms for what the employee should do as part of the job, and have been found to harm employees’ well-being. The current research uses a mixed methods design to examine the role of attributions on the two types of illegitimate tasks: unreasonable and unnecessary tasks. A sample of 432 engineers described a specific illegitimate task that was assigned to them, the attributions they made and their response. They also completed a quantitative questionnaire. Results from both the qualitative (event level) and quantitative (person level) portions of our study portray differences in the attributions made to unreasonable and unnecessary tasks, as well as differential negative effects on employees’ emotions. In addition, hostile attribution bias was found to moderate the relationship between illegitimate tasks and negative emotions, particularly for unreasonable tasks. This supports the theoretical basis for illegitimate tasks because unreasonable tasks pose a potentially greater risk to the employee’s self-worth than unnecessary tasks that are more often assigned at random.     

Personality and the effort-reward imbalance model of stress: Individual differences in reward sensitivity

Abstract

The Effort-Reward Imbalance (ERI) model comprises both situational components (i.e. effort and reward) and a person-specific component (overcommitment). The aims of this study were to investigate the role of theoretically and historically linked personality variables (i.e. overcommitment and Type A personality) within the ERI model and to expand and extend the ERI model by investigating the contribution of individual reward components to both psychological (i.e. psychological distress) and attitudinal (i.e. affective commitment) employee strain indicators. A total of 897 police officers from a large Australian police agency participated in the study. The results provided no evidence of an interaction effect of effort or reward with overcommitment. The Type A variables did, however, make significant contributions and were involved in a number of interactions, suggesting that the person-specific component of the ERI model could be extended with the Type A personality profile. The findings also suggest that the esteem component of reward has the greatest relevance to employee outcomes, although tangible aspects of reward are more likely to act as a buffer of perceived work demand.     

The Use of the Performance Diagnostic Checklist to Guide Intervention Selection in an Independently Owned Coffee Shop

Abstract

The utility of the Performance Diagnostic Checklist (PDC) (Austin, 2000) as an assessment tool to design an intervention for increasing maintenance tasks in an independently owned coffee shop was examined. The PDC, which was administered to four employees, identified a lack of appropriate antecedents and consequences as areas in need of intervention. Based on the results of the PDC, task clarification and a lottery were implemented in a multiple baseline across tasks design to increase employees' completion of maintenance tasks. The results for task group 1 yielded baseline and intervention means of 44% and 86%, respectively. The results for task group 2 yielded baseline and intervention means of 32% and 67%, respectively. A social validity measure indicated that employees thought that the appearance of the shop had improved, believed the changes helped to improve customer satisfaction, and claimed that the new procedures made their job easier. Overall, results suggest that the PDC can be an effective assessment tool for identifying and subsequently targeting specific areas of improvement within an organization.     

Capturing hearts and minds: The influence of relational identification with the leader on followers' mobilization and cardiovascular reactivity

The influence of relational identification (RI) on leadership processes and the effects of social identity leadership on followers' responses to stress have received scant theoretical and research attention. The present research advances theoretical understanding by testing the assertion that high RI with the leader drives follower mobilization of effort and psychophysiological responses to stress. Two experimental scenario studies (Study 1 and Study 2) support the hypothesis that being led by an individual with whom followers perceive high RI increases follower intentional mobilization. Study 2 additionally showed that high (vs. low) RI increases follower resource appraisals and cognitive task performance. A laboratory experiment (Study 3) assessing cardiovascular (CV) reactivity showed that, compared to neutral (i.e., non-affiliated) leadership, being led by an individual with whom participants felt low RI elicited a maladaptive (i.e., threat) response to a pressurized task. In addition, relative to the low RI and neutral conditions, high RI with the leader did not engender greater challenge or threat reactivity. In conclusion, advancing social identity leadership and challenge and threat theory, findings suggest that leaders should be mindful of the deleterious effects (i.e., reduced mobilization and greater threat state) of low RI to optimize follower mobilization of effort and psychophysiological responses to stress.     

Work-related stress,coping resources,and heavy drinking in the restaurant business

Abstract

This study aimed to test whether curvilinearity would add explanatory power to the long-term relationships between job characteristics and mental well-being. The study was based on cross-sectional and longitudinal data from phases 3 and 5 of the Whitehall II sample (N=4154 for job satisfaction and 6000 for context-free mental well-being, mean follow-up 5.8 years). The curvilinear components of the job characteristics were introduced after controlling for the baseline outcome measure, demographic factors, and the linear measures of the job characteristics. The cross-sectional analyses showed only a curvilinear association with the expected U-shape between job demands and context-free mental well-being. The longitudinal analyses showed no curvilinear relationships between the job characteristics and context-free mental well-being. While small non-linear relationships were found between social support and decision latitude and job-related mental well-being, the shape of these relationships was the reverse of that expected. Post hoc analyses revealed that only the positive segment of the relationship between decision latitude and job satisfaction was significant, while both segments of the relationship between social support and job satisfaction were significant. The findings from this study, based on a large sample with high variety in working conditions, provide little support for the assumption of curvilinearity in the long-term relationship between psychosocial working conditions and mental well-being. This has practical implications, as if associations are linear this would indicate that it would be reasonable to take a population (rather than individually targeted) approach to stress management interventions.     

Stress demands on school administrators in Singapore

Abstract

This study investigated the use of the Occupational Stress Indicator (OSI) on school administrators in Singapore. The sample of 223 school administrators consisted of the top management group of principals and vice-principals and the middle management group of heads of department. The school administrators reported pressure at work, and consequently, higher levels of mental and physical ill health. They had high locus of control scores, indicating low internal control over their environment. However, they also reported greater use of coping strategies and higher job satisfaction. Psychometrically, the sub-scales of sources of pressure, job satisfaction, and mental and physical ill health were found to be reliable. The items of the scales of type A, locus of control and coping skills had to be re-factor analysed for the Singaporean sample. The new factors were found to have higher reliability. When the stress and job satisfaction levels of the principals/vice-principals and heads of department were compared, the heads of department reported significantly less job satisfaction and higher levels of mental and physical ill health. They perceived less internal control in their work situation.     

The perception of occupational stress and its relation to research and teaching among academic staff

Abstract

A sample of full-time teaching staff from a former polytechnic participated in a study to examine the relationships between their perception of occupational stress and their involvement in research. Information was obtained from 60% of staff approached. The mean scores on the Occupational Stress Indicator (OSI) for job satisfaction and stress-related measures of mental health and physical health did not differ significantly from data obtained in previous studies on university academic personnel. Scores on these variables were not significantly related to research activity. The degree of satisfaction and degree of stress emanating from participation in research, in teaching and in administration were separately assessed in structured interviews.     

In sickness and in health: An exploration of spousal support and occupational similarity

Abstract

While many studies of interventions have focused on their content and immediate effects, less research has focused on the processes that may explain these effects. The purpose of this study was to show how process evaluation can be used to interpret the results of an intervention study in four industrial canteens in Denmark. Two canteens acted as intervention groups and two as comparison groups. Effects were measured by surveys before and after interventions, and observations and interviews were conducted to provide an in-depth understanding of processes. Analyses were conducted based on the responses from 118 employees. Results showed, contrary to expectations, improvements in working conditions and well-being in one intervention group and in one comparison group, whereas no improvements were found in the two remaining groups. Data from the process evaluation enabled a meaningful interpretation of these results, raising the possibility programme failure rather than theory failure, and thereby constituting an example of how process evaluation can shed light over the factors that may influence outcomes in controlled intervention studies.