Reliability of self-administered Work Ability Index questionnaire among Korean workers

Although the Work Ability Index (WAI) has been used in many countries, its reliability is yet to be validated in Korea. In our study, test–retest results of WAI total score, WAI category and seven subscales were compared. The correlation coefficients of WAI total score and subscales 1 and 2 between test and retest were 0.70, 0.80 and 0.63, respectively. The κ values on WAI category, subscales 4, 5, 6 and 7 were 0.52, 0.32, 0.31, 0.48 and 0.85, respectively. The results of our reliability test show that WAI scores of female, younger and private company workers were found to be higher than those of male, older and public company workers, respectively. We conclude that overall test–retest reliability of WAI in Korea is acceptable. Another notable observation from our study is that work ability dimension (subscales 1, 2 and 7) had a higher reliability, whereas health dimension (subscales 3–6) had a lower reliability.     

A 2-year follow-up study of work ability among college educators

The aim of this study was to evaluate work ability among college educators before and after an intervention at the workplace. An administrative restructuring in the workplace started to be implemented in 2005. The work ability index (WAI) was administered to 154 educators before the restructure in 2004 and to 60 educators following the restructure in 2006. A t-test comparing the WAI score of the 60 educators who took part in both phases showed a trend of improving work ability (p=0.06; mean WAI in 2004 was 41.7 and 43.3 in 2006). The results suggest that the intervention led to an improvement in psychosocial factors, which in turn positively influenced work ability.     

Associations between work ability, health-related quality of life, physical activity and fitness among middle-aged men

The Work ability of ageing work force is a matter of major concern in many countries. The aim of this study was to examine the relationship between perceived work ability and health-related quality of life (HRQoL), and to investigate their associations with age, physical activity and physical fitness in middle-aged men working in blue-collar occupations. The study population consisted of 196 middle-aged (aged 40-60 years) men (construction and industrial work) attending occupationally orientated early medical rehabilitation. They were mostly healthy having only symptoms of musculoskeletal or psychological strain. Perceived work ability was assessed with the work ability index (WAI) and HRQoL with the Rand, 36-item health survey (Rand-36). Information on physical activity was obtained with a structured questionnaire. Cardiorespiratory fitness was estimated with a submaximal exercise test on a cycle-ergometer. The WAI was significantly (p<0.001) associated with the total score of Rand-36, and with all its domains. Age, physical activity and cardiorespiratory fitness were neither associated with the WAI, nor did physical activity predict any of the dimensions of Rand-36. Cardiorespiratory fitness was associated with the physical functioning dimension of the Rand-36 whilst age was positively associated with the dimensions of the energy, emotional well being and social functioning of the Rand-36. The present study on middle-aged men showed a close relationship between perceived work ability and the HRQoL. It is suggested that the promotion of work ability may have beneficial effects on quality of life.     

Main and interactive effects of shiftwork, age and work stress on health in an Italian sample of healthcare workers

Among healthcare workers, shiftwork (mostly if nightwork is also included), ageing and work-related stress may be factors leading to impaired health. Such risk factors may also operate in interaction, resulting in an even increased harm for health. The present study aims at evaluating these relationships in a sample of 1842 hospital workers in Northern Italy. Subjects were mainly women, 33.1% were aged > or = 45 yr, and they were almost evenly distributed between dayworkers and rotating shiftworkers (nights included). Shiftwork was associated with poor sleep, while it was protective against gastrointestinal disorders, poor work ability and job dissatisfaction. Work stress was the risk factor with the highest relevance for poor health. Ageing was associated with lower physical health. Few significant interactions were observed. Shiftwork with nights and high work stress significantly interacted in increasing the risk for poor sleep. The "healthy worker effect" may have played a strong role in study findings.     

The impact of work-related and personal resources on older workers’ fatigue,work enjoyment and retirement intentions over time

Abstract

This study aims to examine the impact of work-related and personal resources on older workers’ retirement intentions by studying the pathways (fatigue and work enjoyment) from resources to retirement intentions, the buffering role of resources for psychological job demands, in a cross-sectional and longitudinal timeframe. Longitudinal results on a subsample of full-time, older workers (n = 1642) from the Maastricht Cohort Study suggest that over four years of follow-up personal resources like personal mastery and perceived health related to less (prolonged) fatigue and more work enjoyment. Personal mastery also related to later retirement intentions. A work-related resource like decision authority related to less prolonged fatigue. (Prolonged) fatigue related to earlier retirement intentions, suggesting that fatigue may be a pathway to early retirement. Finally, little evidence was found for effect modification by resources. This prospective study indicates that work-related and personal resources may be useful for prolonging working careers.

Practitioner Summary: To date, the impact of work-related and personal resources on older workers’ retirement intentions is rarely studied. As this prospective study shows that resources may impact older workers’ (prolonged) fatigue, work enjoyment and retirement intentions, the monitoring and fostering of resources is of importance for prolonging their working careers.     

Developing a holistic understanding of workplace health: the case of bank workers

Understanding health in the workplace from a holistic perspective requires appropriate research approaches. An exploratory, qualitative study with whitecollar employees from a large banking organization in the North West of England is detailed here. The aim was to explore health from the perspective of the employee. Semi-structured interviews (n = 29) elicited detailed responses, allowing the relationship between psychosocial and lifestyle factors to be examined. Psychosocial factors such as job design, ability to make decisions and control over work were all reported to be positive contributors to health in the work setting-and often were reported to be more relevant than individual lifestyle issues. A more holistic approach to developing workplace health programmes in the future is recommended, which allows the workplace setting to be considered as a complex system. Very few comprehensive workplace health programmes exist at present within UK organizations, and there is a tendency for programmes to be designed by the health professional ‘expert’ rather than developed in conjunction with, and by the workforce. It is argued that qualitative research methods can help to begin the dialogue needed for workplace health programme development.     

A gender approach to work ability and its relationship to professional and domestic work hours among nursing personnel

The association between working hours and work ability was examined in a cross-sectional study of male (N=156) and female (N=1092) nurses in three public hospitals. Working hours were considered in terms of their professional and domestic hours per week and their combined impact; total work load. Logistic regression analysis showed a significant association between total work load and inadequate work ability index (WAI) for females only. Females reported a higher proportion of inadequate WAI, fewer professional work hours but longer domestic work hours. There were no significant differences in total work load by gender. The combination of professional and domestic work hours in females seemed to best explain their lower work ability. The findings suggest that investigations into female well-being need to consider their total work load. Our male sample may have lacked sufficient power to detect a relationship between working hours and work ability.     

Job stress management and ergonomic intervention for work-related upper extremity symptoms

In practice the secondary prevention of work-related upper extremity (WRUE) symptoms generally targets biomechanical risk factors. Psychosocial risk factors have also been shown to play an important role in the development of WRUE symptom severity and future disability. The addition of a stress management component to biomechanically focused interventions may result in greater improvements in WRUE symptoms and functional limitations than intervening in the biomechanical risk factors alone. Seventy office workers with WRUE symptoms were randomly assigned to an ergonomics intervention group (assessment and modification of work station and stretching exercises) or a combined ergonomic and job stress intervention group (ergonomic intervention plus two 1-h workshops on the identification and management of workplace stress). Baseline, 3- and 12-month follow-up measures of observed ergonomic risks and self-reported ergonomic risks, job stress, pain, symptoms, functional limitation, and general physical and mental health were obtained from all participants. While both groups experienced significant decreases in pain, symptoms, and functional limitation from baseline to three months with improvements continuing to 12 months post baseline, no significant differences between groups were observed for any outcome measures. Findings indicate that the additional two-session job stress management component did not significantly enhance the short- or long-term improvements brought about by the ergonomic intervention alone.     

Stress management in the workplace: A comparison of a computer-based and an in-person stress-management intervention

Work stress contributes significantly to corporate health costs. Numerous corporations have implemented worksite stress-management interventions to mitigate the financial and personal impact of stress on their employees. Cognitive-behavioral stress-management interventions can reduce both perceived and physiologically measured stress. Traditionally, these interventions have been delivered in small, instructor-led groups. Outcomes from a stress-management intervention provided via an instructor led versus a computer-presented format were compared through a randomized, controlled design. Brief relaxation procedures presented in both formats led to highly significant reductions in immediately-reported stress. Stress reduction, however, was not associated with improvement in longer-term indices of workplace stress following completion of the intervention and at a one-month follow-up. Attrition was significantly higher in the computer-presentation format. Across both presentation formats, however, more frequent use of stress-reduction techniques was correlated significantly with greater reductions in stress indices (e.g., nervousness, social isolation, overall work stress) at follow-up.     

Women at work: summary and overview

Abstract

This paper reports the discussions which took place at the Women at Work Conference, Nottingham, 1982. In doing so it introduces and discusses several issues of current importance, relating to occupational stress and health, human factors, women, work and children and training. The conference recommendations are also reviewed.     

Occupational stress in submariners: The impact of isolated and confined work on psychological well-being

This study aimed to identify work-related and personal factors associated with occupational stress in submariners. Work and well-being questionnaires were distributed to 219 male submariners (mean age 34 years), as part of a larger cohort study involving a stratified sample of 4951 Royal Navy (RN) personnel. The stress rate in submariners was 40%; significantly higher than the stress rate in the general RN, although once demographic factors were controlled for in a matched control sample, this difference was no longer significant. A summary model accounted for 49% of the variance in submariner stress, with key differences emerging between the occupational factors associated with stress in submariners and in the general RN. The longitudinal nature of this study permits stress in submariners to be monitored over 5 years, which will provide valuable insights into the chronicity of stress in this specialised occupational group.

Statement of Relevance: This paper contributes to the current literature on the negative impact of working in isolated conditions. It is demonstrated that occupational stress in submarines can be partially explained using current theories of stress in the workplace. However, the constraints of a restricted environment introduce additional factors which can also be associated with occupational stress.     

Night shift dose and stress at work

In a new approach to the problem of night work and its consequences, an investigation of the relationships between shift variables, stress at work (environmental and psychosocial aspects), well-being and health, and lifestyle characteristics was carried out, taking into consideration the actual number of remunerated night shifts (‘night shift dose’ (NSD)). Out of the entire workforce (n=173) of a manufacturing plant of the cement industry located in Lower Austria, a group of 31 shiftworkers, working approximately 44 night shifts per year on average was examined in detail. Between night shift dose and psychosocial stress, an important relationship was detected. Taking into account workers' well-being and health, the results suggest that psychosocial and environmental stress factors at work act independently from shift-related stress factors.     

Recovery in sensory-enriched break environments: integrating vision,sound and scent into simulated indoor and outdoor environments

To deal with stress and exhaustion at work, personal resources need to be replenished during breaks. The aim of this laboratory study (n?=?122 students) was to test the restorative potential of sensory-enriched break environments (SEBEs) in between-subjects with repeated measures design, focusing on the type of the environment (natural outdoor vs. built indoor environment) and sensory input (no sensory input vs. audiovisual input vs. audiovisual and olfactory input). Analyses showed that SEBEs simulating either a natural or a lounge environment were perceived as more pleasant and restorative (fascination/being away) than a standard break room, which in turn facilitated the recovery of personal resources (mood, fatigue, arousal). Moreover, adding a congruent scent to an audiovisual simulation indirectly facilitated the recovery of personal resources via greater scent pleasantness and higher fascination and being away. The current study shows the opportunities for sensory enrichment to foster restoration in break environments.     

Reliability-based and deterministic design optimization of a FSAE brake pedal: a risk allocation analysis

While probabilistic designs can translate into significant weight savings through better risk allocation, deterministic design optimization remains widely used in industry. To promote the use of probabilistic designs among engineering students and practitioners, this work solves reliability based design optimization (RBDO) and deterministic design optimization (DDO) models of a FSAE brake pedal with multiple failure modes (stress and buckling) with their relative performance evaluated through a risk allocation analysis. The problems of interest were systematically solved through the following steps: i) topology optimization to specify the brake-pedal shape, ii) numerical 3D brake-pedal modeling under uncertainty for stress and buckling analysis, iii) mass (M), maximum von Mises stress (S_max) and buckling load factor (f_buck) surrogate modeling, iv) global sensitivity analysis and surrogate model selection, and v) surrogate-based RBDO and DDO with risk allocation analysis. Results show that when compared to DDO with alternative safety factors, for the same probability of system failure, the RBDO brake pedal designs were significantly lighter and more robust (less mass variability).     

Intermittent microclimate cooling during rest increases work capacity and reduces heat stress

Requirements for special protective equipment while working in hazardous environments can present a significantly increased thermal burden and early onset of physical fatigue. Ambulatory (backpack) or tethered personal cooling can accelerate metabolic heat removal, but is often not practical from an ergonomic standpoint. The efficacy of incorporating personal cooling during non-ambulatory rest periods was evaluated in subjects (n=8) with varying levels of fitness. Treadmill work (≈475 W, 40% [Vdot]O₂max) was alternately performed for 30 min followed by 30 min of rest. Subjects walked and rested under three separate experimental conditions: (1) control (C), in which light clothing was worn; (2) CPE, in which a chemical protective ensemble (CPE) was worn, and (3) CPE plus intermittent microclimate cooling (COOL). The WBGTcondition for all trials was 31°C. During the COOL trial the subjects additionally wore a personal cooling vest which allowed for the circulation of chilled liquid over the torso during rest. Under C conditions, relatively modest changes in rectal temperature (T _re ) were observed, which stabilized over time. CPE wear resulted in a progessive rise in T _re and early fatigue. The addition of intermittent cooling during each rest cycle (COOL trial) significantly attenuated heat storage such that an oscillating, but equilibrated T _re was established and work capacity was at least doubled. Moreover, the perceived cooling effect was appreciable for all subjects. Therefore, intermittent personal cooling provided a useful means of enhancing work productivity and may have application for certain military and industrial personnel performing heavy work in hot environments. This approach should provide a practical alternative for reducing stress/fatigue when work/rest cycles are employed.     

Dancing between theory and practice: Enhancing work engagement through work stress intervention

This quasi‐experimental and longitudinal study assesses the effectiveness of a work stress intervention (i.e., Team Redesign) to increase job and personal resources and to consequently reduce job strain and increase employee psychosocial well‐being in an enamel manufacturing company following the Resources‐Experiences‐Demands Model (RED Model) and within the Action‐Research approach. The sample consisted of 108 employees at Time 1 and 72 employees at Time 2. Repeated‐measures multivariable analysis of variance (MANOVA) showed that the Time × Intervention interaction had reliable, positive, and incremental effects on job resources (i.e., innovation climate), personal resources (i.e., professional self‐efficacy and perceived competence), and motivational outcomes (i.e., work engagement, vigor, and dedication) on the intervention group (laboratory team, n = 9) when compared with the control group (n = 63 employees from different departments). Finally, we discuss the theoretical and practical implications based on the RED Model, including the feedback from Intervention (Action) to Theory (Research). © 2010 Wiley Periodicals, Inc.     

Prevention of musculoskeletal disorders at work: Validation and reliability in a multicenter intervention study

During the years 1986–1989 The Finnish Work Environment Fund initiated a multicenter, intervention study (programme) to prevent musculoskeletal disorders at work. The programme consisted of four different projects comprising methodological, epidemiological, and interventive themes. The main results were as follows: (1) More than half of the occupational physiotherapists and physicians involved in the project felt that they did not have adequate training for testing the performance capacity of the musculoskeletal system. Several of the most commonly used musculoskeletal tests had either poor validity in predicting future musculoskeletal troubles or had poor reliability. (2) A controlled intervention study showed that active training of neck-shoulder muscles can prevent musculoskeletal troubles, even more than ergonomic actions. (3) It is possible to reduce sick-leave due to low-back disorders by intervention measures directed toward both the work (environment, tools) and the workers (working methods, positive attitude to work, preparedness to keep fit). (4) The identification of ergonomic hazards with the help of teamwork proved to be feasible. The practical improvements, however, were difficult to implement in the prevailing conditions. Some of the improvements increased the work load and the stress of the workers. This aspect needs further consideration.     

The prevalence and causation of tennis elbow (lateral humeral epicondylitis) in a population of workers in an engineering industry

Lateral humeral epicondylitis (tennis elbow) is often considered to be work related but the incidence and prevalence among industrial workers has not previously been studied

In this study the prevalence of this condition and its relationship to some work factors was investigated in 540 workers in a modern engineering industry

The prevalence was 7-4% (40/540). Work was found to be the probable cause in 35%, tennis in 8% and other leisure activities in 27% of the patients. No cause was found in the remaining 30%. There was no correlation with sex, while a significant correlation was found with age, the incidence increasing with advancing age

On the basis of job classification according to their elbow stress, it was found that these workers with work-related epicondylitis had higher elbow stress jobs compared to other sufferers and to the workforce as a whole.     

Impact of workload on cognitive performance of control room operators

Cognition, Technology & Work - Workload has long been considered as one of the important factors for personal functions and malfunctions, particularly in complex systems. Undertaking operations...     

Real-time core body temperature estimation from heart rate for first responders wearing different levels of personal protective equipment

First responders often wear personal protective equipment (PPE) for protection from on-the-job hazards. While PPE ensembles offer individuals protection, they limit one's ability to thermoregulate, and can place the wearer in danger of heat exhaustion and higher cardiac stress. Automatically monitoring thermal–work strain is one means to manage these risks, but measuring core body temperature (T_c) has proved problematic. An algorithm that estimates T_c from sequential measures of heart rate (HR) was compared to the observed T_c from 27 US soldiers participating in three different chemical/biological training events (45–90 min duration) while wearing PPE. Hotter participants (higher T_c) averaged (HRs) of 140 bpm and reached T_c around 39°C. Overall the algorithm had a small bias (0.02°C) and root mean square error (0.21°C). Limits of agreement (LoA ± 0.48°C) were similar to comparisons of T_c measured by oesophageal and rectal probes. The algorithm shows promise for use in real-time monitoring of encapsulated first responders.