International Journal of Industrial Ergonomics, 1999
Posture (optoelectronic 3D motion analysis system), muscular load (EMG), perceived exertion (rati... more Posture (optoelectronic 3D motion analysis system), muscular load (EMG), perceived exertion (rating scales), preference and productivity were investigated in 20 healthy VDU-operators (10 male and 10 female) during text editing with two different data input devices, a mouse and a track-ball. Work with the track-ball entailed lower shoulder elevation and less neck/shoulder muscle activity than work with the mouse. Arm support reduced muscle activity in the neck/shoulder region irrespective of input device used. A table height lower than 3 cm above elbow height allowed arm and shoulder support without undue shoulder elevation. Work with the track-ball entailed more wrist extension than work with the mouse. Perceived exertion ratings were lower for the shoulder and higher for the hand with track-ball than with mouse operation. Thus, biomechanical demands differ between different input devices. The women elevated and rotated their right shoulder outwards more than the men during work with both input devices. The overall EMG results showed a higher activity among the women than among the men in two of the examined muscles. This may relate to anthropometric differences which also influence biomechanical load moments. Another reason could be the observed differences in working techniques between the men and the women. Relevance to industry The design of input devices affects levels of muscular load in neck/shoulder and hand/forearm muscles. Joint positions differ depending on the size and design of the input device and the operators' anthropometry. The design of input devices should be adapted to the differences in work tasks and variations of human dimensions in order to avoid injuries and to enhance the effectiveness of VDU work.
Objectives This study attempted to identify work and leisure-time conditions and life-style facto... more Objectives This study attempted to identify work and leisure-time conditions and life-style factors associated with excess metabolic levels (metabolic demands exceeding one-third of a person's aerobic capacity) at work among men and women.
Http Dx Doi Org 10 1080 0267837031000099168, Nov 26, 2010
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
Objective. To evaluate the impact of two laptop designs (with or without palm rest) and two work ... more Objective. To evaluate the impact of two laptop designs (with or without palm rest) and two work situations (on desk or lap) on neck and upper limb posture, muscle activity and productivity.
Musculoskeletal disorders constitute a considerable public health problem, often resulting in sic... more Musculoskeletal disorders constitute a considerable public health problem, often resulting in sickness absence, particularly in public sector employees. Increased knowledge on how this is related to individual and work-related factors is required. The objective of this study was to investigate the associations between self-reported musculoskeletal pain and the following factors: physical and psychosocial work conditions, lifestyle, psychosomatic symptoms and sick leave. A comprehensive questionnaire was completed by a total of 2523 people, of which 87% were women and 13% men. The participants were employed in public hospitals, educational institutions, home care services for the elderly and domestic/catering services in a Swedish county. The response rate was 92%. Multiple logistic regression analyses showed that the high level of self-reported musculoskeletal pain was highly associated with strenuous physical and psychosocial work conditions. The physical factor with the highest od...
To compare health and exposures at work and at home of women and men with the same educational ba... more To compare health and exposures at work and at home of women and men with the same educational background. The study group consisted of 3831 individuals, grouped into three educational categories based on length of education. Category 1, which represents 9-year compulsory school; Category 2, which includes 3-year upper secondary school, i.e. in total 12 years of education; and Category 3, which includes post-secondary school, such as university. They responded to a questionnaire that included questions on health and exposures at work and at home. Significant differences were shown in health outcomes between women and men with the same educational background and also in exposures in their professional and private lives. Associations between educational background and health were found and analyses revealed that men with a university education run the lowest risk of developing ill health. Women with the same educational background as men are differently exposed, both in paid and unpai...
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
The purpose of this study was to describe and analyse the effects of health-promoting educational... more The purpose of this study was to describe and analyse the effects of health-promoting educational interventions among employees in a municipality in Sweden. A randomized controlled educational intervention study was performed with 340 employees. Supervisors and workplace champions took part in two separate educational programmes with focus on health promotion. Intervention groups were teams of supervisors, teams of workplace champions and a mixed group (supervisors and workplace champions). The control group did not take part in any of the activities. Evaluations with physical fitness tests and a self-administrated questionnaire were performed twice. Focus group discussions were held. All groups raised their physical fitness level from baseline to follow-up. Females in the supervisor group had increased their mean maximal oxygen uptake from 32.0 mlO(2)/kg*min to 34.9 mlO(2)/kg*min which was more than the others. Supervisors had reached increased knowledge within the area 'organizational factors' and behavioural changes had been obtained within the area 'life-style'. Workplace champions working together with their supervisors had an easier and more motivated situation than workplace champions working by themselves. Coaching supervisors as well as the mixed group seemed to improve the intervention of health promotion most and should be continued.
Development, specification and evaluation of a work table, suitable for VDU work with a mouse, wa... more Development, specification and evaluation of a work table, suitable for VDU work with a mouse, was carried out in collaboration with furniture manufacturers, employees and an employer in a Research and Development Company. Ten VDU-operators expressed their ideas for improvements at their present workstations and the company and the researchers made a preliminary version of workstation specification to the furniture manufacturers. The three different furniture manufacturers set up four test stations with prototype tables, which were evaluated by 39 subjects using comfort ratings. The results of the comfort ratings and comments from the subjects were used when the final specification for new workstations was made. Three new work tables were evaluated in the ten selected operators' ordinary environment. Evaluations were made by technical recordings of physical load during work and by preference studies. The most important results from the evaluation can be summarized as follows: the work table should make it possible to support the arms, make it possible to vary between sitting and standing posture and prevent extreme outward rotation of the shoulder. Futhermore, the study showed that it is possible to improve the furniture manufacturers' knowledge and attitudes regarding how to minimize musculoskeletal disorders and to improve the study persons' working technique.
Scandinavian Journal of Work Environment Health, Jun 1, 1993
Exposure data from self-administered questionnaires on manual materials handling and work posture... more Exposure data from self-administered questionnaires on manual materials handling and work postures were validated in relation to direct measurements and systematic observations on 39 men and 58 women representing 45 different occupations. The agreement was tested at a dichotomous level and, when possible, with quantification of duration or frequency. At the dichotomous level the agreement was "acceptable" for nine variables concerning work postures and the handling of loads weighing > 5 kg. No variable showed "acceptable" agreement when the duration or the frequency was quantified in more detail (4- to 6-point scales). Musculoskeletal complaints seemed to introduce a differential bias for some lifting variables. Thus some variables for postures or the handling loads of > 5 kg may, under certain conditions, be acceptable for use in epidemiologic studies when the relative risks are high. However, self-reported exposure seems to be too crude if more-detailed information is required.
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
The present case-study, which is rather small in number of subjects but has a broad perspective, ... more The present case-study, which is rather small in number of subjects but has a broad perspective, is part of a larger investigation designed to initiate development processes in working life in one specific region in Sweden. This study may serve as an example of ergonomic fieldwork with a gender perspective. The overall aim was to examine the physical and psychosocial working conditions among a group of female hot food distributors, and to relate these conditions to other traditionally heavy work within the same working unit, as well as to suggest improvements. The study group consisted of ten female municipal employees in a provincial town. Structured interviews about the psychosocial working conditions, measurements of heart rate, ratings of self-reported perceived exertion and observations of one working day were performed. The overall impression from the study was that the food distributors in several aspects had a very difficult working situation that ought to be improved. The food distributors reported high psychological demands and low decision latitude, time pressure and dissatisfaction with not being able to live up to the pensioners' and the employer's expectations. They also had a high heart rate increase during work, which may be a risk factor for impaired health. Several short-term and long-term solutions were suggested to reduce and redistribute the total workload. The employer has attended to some suggested short-term solutions and the follow-up study showed that the working conditions had been improved. A reduction of cardiovascular load, as well as self-rated physical exertion, was noted and the work was perceived as substantially less stressful.
Journal of Occupational and Environmental Medicine, 2002
The aim of the study was to evaluate eight questions concerning physical loads, used in public he... more The aim of the study was to evaluate eight questions concerning physical loads, used in public health questionnaires. Working women and men (203) completed a self-administered questionnaire twice, following a test-retest method. The questions were also validated with a structured interview. Response agreement was calculated with Cohen's kappa statistics with quadratic weights (kappa w). Test-retest agreement varied from 0.74 to 0.92, and inter-method agreement from 0.38 to 0.81. The lowest coefficients were for the questions concerning bent/twisted work postures (kappa w 0.38) and repetitive movements (kappa w 0.39). The results did not indicate any substantial influence of gender, type of work or musculoskeletal complaint. The questions concerning general physical activity and sitting work postures, and physical exercise/sports during leisure times, had good validity. The questions concerning bent/twisted work posture and repetitive movements need to be re-designed.
Journal of Occupational and Environmental Medicine, 1995
In ergonomic epidemiology exposure to local loads as well as cardiovascular load may contribute t... more In ergonomic epidemiology exposure to local loads as well as cardiovascular load may contribute to general and local fatigue and musculoskeletal disease. Self-reported exposure is often the only feasible method in large population studies. The aim of this study was to evaluate retrospectively self-reported physical activity and perceived exertion as estimates of cardiovascular load during occupational work. The study population consisted of 39 men, representing 25 different occupations, and 58 women, representing 28 occupations. Ratings of physical exertion (RPE scale) and physical activity (Edholm scale transferred to multiples of the basal metabolic rate, METs) at the end of a work shift were correlated with the average heart rate during the same work shift. In the male population, both RPE ratings and METs correlated significantly (P < .01) with the average heart rate. No such correlation was observed in the female population.
International Journal of Industrial Ergonomics, 2002
The aim of the present study was to describe working conditions and the prevalence of musculoskel... more The aim of the present study was to describe working conditions and the prevalence of musculoskeletal symptoms among male and female VDU operators, and to assess associations between work-related physical and psychosocial exposures and neck and upper limb symptoms by gender. The study population comprised a variety of occupations from both private and public sectors. Data on physical and psychosocial exposures were collected by questionnaires, as were data on musculoskeletal symptoms. Univariate associations between exposures and symptoms affecting the neck and upper limbs were estimated by calculating the prevalence ratios with 95% confidence intervals. We also assessed the potential excess odds ratio attributable to interaction between gender and, one by one, exposure variable. Women (n ¼ 785) used the computer on average 3.9 h/day and men (n ¼ 498) 3.6. Variation of different work tasks was lower among females than among males. Nineteen per cent of the women and 12% of the men did >3 h of continued computer work without breaks (>10 min) at least twice a week. Twice as many women as men experienced high job strain (high demands and low decision latitude). A higher proportion of women than men reported symptoms X3 days the preceding month from the upper body, irrespective of body region. For many of the studied exposures the prevalence of symptoms in one or several body regions was increased with increasing exposure, indicating exposureresponse relationships. Duration of computer work was associated with symptoms among both men and women. Only among men, duration of work with a non-keyboard computer input device was associated with symptoms. Only among women, job strain was associated with symptoms. Time pressure was associated with higher prevalence of symptoms among women. Among men, time pressure was associated with lower prevalence of symptoms. Thus, the associations differed between the genders. Women experienced higher prevalence of symptoms than men in all body regions and they were more often exposed to physical and psychosocial conditions that in previous studies have been considered harmful, than men.
International Archives of Occupational and Environmental Health, 2007
Objectives The main aim of this study was to explore the associations between appraised leadershi... more Objectives The main aim of this study was to explore the associations between appraised leadership styles, psychosocial work factors and musculoskeletal pain among subordinates in four diVerent public service sectors from an epidemiological perspective. Methods A cross-sectional questionnaire study was conducted; data from 2,403 public sector employees in subordinate positions (86% women) were analysed. The appraised leadership styles were measured through items from a modiWed version of the CPE questionnaire (C change, P production/structure, E employee/relation). The structure validity of the CPE-model was examined by principal component analysis (PCA). Univariate and multivariate analyses of associations between levels of musculoskeletal pain and appraised leadership styles and with psychosocial work factors were conducted. Odds ratios (ORs) with conWdence intervals (CIs) of 95% were used as a measure of associations. Results There were small variations in the appraisals of the immediate manager among the subordinates. However, the associations between musculoskeletal pain and leadership styles varied according to sector. Poor appraisals (low scores) on "change" and "employee relation" dimensions were associated with high levels of musculoskeletal pain in two sectors: home and health care services. In the domestic catering services, poor appraisals of managers in the "production/structure" dimension had the strongest association with high levels of pain. In general, poor appraisals of the "change" dimension was most strongly associated with high levels of musculoskeletal pain. "High work demands" had the strongest association with high levels of pain, particularly among the men. Conclusions Poor appraisals of managers and their leadership styles were associated with high levels of musculoskeletal pain among both female and male subordinates in diVerent public service sectors. There is therefore a great need of further studies of the mechanisms behind the relationships between the leadership styles and their impact on health among the genders.
The purpose of this study was to investigate the prevalence of the excess of metabolic level (met... more The purpose of this study was to investigate the prevalence of the excess of metabolic level (metabolic demands in work exceeding one-third of the individual's aerobic capacity) of working men and women today and to describe the population whose metabolic level is exceeded. A second aim was to explore how externally assessed metabolic demands match with the physical function and capacity of working men and women in jobs with the lowest and the highest demands. The aerobic power of each individual (94 men and 94 women) was estimated from heart rate and workload in sub-maximal tests from dynamic legwork on a cycle ergometer. Physical activity was assessed using a task-oriented interview technique. Physical function was measured by tests of muscle endurance in arms, abdomen and legs, handgrip pressure, balance and coordination. The calculation of individual metabolic demands during a "typical working day" showed that 27% of the men and 22% of the women exceeded their metabolic level. The results indicate that the physical fitness is low or somewhat low for two-thirds of the 94 men and for more than one-half of the 94 women. Women in the group with the highest job demands had significantly lower muscle endurance in the abdomen and legs and worse coordination than women in the group with the lowest job demands. Metabolic demands in working life today remain high. This is reflected in a mismatch between individual physical capacity and the physical demands of work for 25% of the population.
Work postures and movements of the upper limb were analysed for 12 'mouse' operat... more Work postures and movements of the upper limb were analysed for 12 'mouse' operators and 12 'non-mouse' computer operators employed in word-processing work. Measurements were carried out during correction of a given text. 'Mouse' operators spent 64% of the working time with the operative wrist deviating more than 15 degrees towards the ulnar side, while 'non-mouse' operators spent 96% of the time with the corresponding wrist in neutral position towards radial deviation. The rotation in the shoulder was at all times in neutral position towards inward rotation for 'non-mouse' operators, while 'mouse' operators worked 81% of the time with the shoulder rotated outward more than 30 degrees. 'Mouse' operators corrected a longer text during the given time. Our observations showed long periods of strenuous working postures for 'mouse' operators compared to 'non-mouse' operators. We believe that further investigations need to be carried out on the effects of word-processing techniques and to develop ergonomic work station designs for the 'mouse' and other non-keyboard input devices.
Musculoskeletal disorders are more common among women than among men. When comparing the differen... more Musculoskeletal disorders are more common among women than among men. When comparing the difference between men and women in the prevalence of musculoskeletal disorders, methodological problems arise as men and women seldom perform the same type of activities, neither at work nor at home.
International Journal of Industrial Ergonomics, 1999
Posture (optoelectronic 3D motion analysis system), muscular load (EMG), perceived exertion (rati... more Posture (optoelectronic 3D motion analysis system), muscular load (EMG), perceived exertion (rating scales), preference and productivity were investigated in 20 healthy VDU-operators (10 male and 10 female) during text editing with two different data input devices, a mouse and a track-ball. Work with the track-ball entailed lower shoulder elevation and less neck/shoulder muscle activity than work with the mouse. Arm support reduced muscle activity in the neck/shoulder region irrespective of input device used. A table height lower than 3 cm above elbow height allowed arm and shoulder support without undue shoulder elevation. Work with the track-ball entailed more wrist extension than work with the mouse. Perceived exertion ratings were lower for the shoulder and higher for the hand with track-ball than with mouse operation. Thus, biomechanical demands differ between different input devices. The women elevated and rotated their right shoulder outwards more than the men during work with both input devices. The overall EMG results showed a higher activity among the women than among the men in two of the examined muscles. This may relate to anthropometric differences which also influence biomechanical load moments. Another reason could be the observed differences in working techniques between the men and the women. Relevance to industry The design of input devices affects levels of muscular load in neck/shoulder and hand/forearm muscles. Joint positions differ depending on the size and design of the input device and the operators' anthropometry. The design of input devices should be adapted to the differences in work tasks and variations of human dimensions in order to avoid injuries and to enhance the effectiveness of VDU work.
Objectives This study attempted to identify work and leisure-time conditions and life-style facto... more Objectives This study attempted to identify work and leisure-time conditions and life-style factors associated with excess metabolic levels (metabolic demands exceeding one-third of a person's aerobic capacity) at work among men and women.
Http Dx Doi Org 10 1080 0267837031000099168, Nov 26, 2010
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
Objective. To evaluate the impact of two laptop designs (with or without palm rest) and two work ... more Objective. To evaluate the impact of two laptop designs (with or without palm rest) and two work situations (on desk or lap) on neck and upper limb posture, muscle activity and productivity.
Musculoskeletal disorders constitute a considerable public health problem, often resulting in sic... more Musculoskeletal disorders constitute a considerable public health problem, often resulting in sickness absence, particularly in public sector employees. Increased knowledge on how this is related to individual and work-related factors is required. The objective of this study was to investigate the associations between self-reported musculoskeletal pain and the following factors: physical and psychosocial work conditions, lifestyle, psychosomatic symptoms and sick leave. A comprehensive questionnaire was completed by a total of 2523 people, of which 87% were women and 13% men. The participants were employed in public hospitals, educational institutions, home care services for the elderly and domestic/catering services in a Swedish county. The response rate was 92%. Multiple logistic regression analyses showed that the high level of self-reported musculoskeletal pain was highly associated with strenuous physical and psychosocial work conditions. The physical factor with the highest od...
To compare health and exposures at work and at home of women and men with the same educational ba... more To compare health and exposures at work and at home of women and men with the same educational background. The study group consisted of 3831 individuals, grouped into three educational categories based on length of education. Category 1, which represents 9-year compulsory school; Category 2, which includes 3-year upper secondary school, i.e. in total 12 years of education; and Category 3, which includes post-secondary school, such as university. They responded to a questionnaire that included questions on health and exposures at work and at home. Significant differences were shown in health outcomes between women and men with the same educational background and also in exposures in their professional and private lives. Associations between educational background and health were found and analyses revealed that men with a university education run the lowest risk of developing ill health. Women with the same educational background as men are differently exposed, both in paid and unpai...
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
The purpose of this study was to describe and analyse the effects of health-promoting educational... more The purpose of this study was to describe and analyse the effects of health-promoting educational interventions among employees in a municipality in Sweden. A randomized controlled educational intervention study was performed with 340 employees. Supervisors and workplace champions took part in two separate educational programmes with focus on health promotion. Intervention groups were teams of supervisors, teams of workplace champions and a mixed group (supervisors and workplace champions). The control group did not take part in any of the activities. Evaluations with physical fitness tests and a self-administrated questionnaire were performed twice. Focus group discussions were held. All groups raised their physical fitness level from baseline to follow-up. Females in the supervisor group had increased their mean maximal oxygen uptake from 32.0 mlO(2)/kg*min to 34.9 mlO(2)/kg*min which was more than the others. Supervisors had reached increased knowledge within the area 'organizational factors' and behavioural changes had been obtained within the area 'life-style'. Workplace champions working together with their supervisors had an easier and more motivated situation than workplace champions working by themselves. Coaching supervisors as well as the mixed group seemed to improve the intervention of health promotion most and should be continued.
Development, specification and evaluation of a work table, suitable for VDU work with a mouse, wa... more Development, specification and evaluation of a work table, suitable for VDU work with a mouse, was carried out in collaboration with furniture manufacturers, employees and an employer in a Research and Development Company. Ten VDU-operators expressed their ideas for improvements at their present workstations and the company and the researchers made a preliminary version of workstation specification to the furniture manufacturers. The three different furniture manufacturers set up four test stations with prototype tables, which were evaluated by 39 subjects using comfort ratings. The results of the comfort ratings and comments from the subjects were used when the final specification for new workstations was made. Three new work tables were evaluated in the ten selected operators' ordinary environment. Evaluations were made by technical recordings of physical load during work and by preference studies. The most important results from the evaluation can be summarized as follows: the work table should make it possible to support the arms, make it possible to vary between sitting and standing posture and prevent extreme outward rotation of the shoulder. Futhermore, the study showed that it is possible to improve the furniture manufacturers' knowledge and attitudes regarding how to minimize musculoskeletal disorders and to improve the study persons' working technique.
Scandinavian Journal of Work Environment Health, Jun 1, 1993
Exposure data from self-administered questionnaires on manual materials handling and work posture... more Exposure data from self-administered questionnaires on manual materials handling and work postures were validated in relation to direct measurements and systematic observations on 39 men and 58 women representing 45 different occupations. The agreement was tested at a dichotomous level and, when possible, with quantification of duration or frequency. At the dichotomous level the agreement was "acceptable" for nine variables concerning work postures and the handling of loads weighing > 5 kg. No variable showed "acceptable" agreement when the duration or the frequency was quantified in more detail (4- to 6-point scales). Musculoskeletal complaints seemed to introduce a differential bias for some lifting variables. Thus some variables for postures or the handling loads of > 5 kg may, under certain conditions, be acceptable for use in epidemiologic studies when the relative risks are high. However, self-reported exposure seems to be too crude if more-detailed information is required.
The objective of the study was to develop a multivariate approach to occupational health studies ... more The objective of the study was to develop a multivariate approach to occupational health studies that is: capable of identifying groups with similar working conditions; relevant for studies of associations between working and living conditions and health; and an ...
The present case-study, which is rather small in number of subjects but has a broad perspective, ... more The present case-study, which is rather small in number of subjects but has a broad perspective, is part of a larger investigation designed to initiate development processes in working life in one specific region in Sweden. This study may serve as an example of ergonomic fieldwork with a gender perspective. The overall aim was to examine the physical and psychosocial working conditions among a group of female hot food distributors, and to relate these conditions to other traditionally heavy work within the same working unit, as well as to suggest improvements. The study group consisted of ten female municipal employees in a provincial town. Structured interviews about the psychosocial working conditions, measurements of heart rate, ratings of self-reported perceived exertion and observations of one working day were performed. The overall impression from the study was that the food distributors in several aspects had a very difficult working situation that ought to be improved. The food distributors reported high psychological demands and low decision latitude, time pressure and dissatisfaction with not being able to live up to the pensioners' and the employer's expectations. They also had a high heart rate increase during work, which may be a risk factor for impaired health. Several short-term and long-term solutions were suggested to reduce and redistribute the total workload. The employer has attended to some suggested short-term solutions and the follow-up study showed that the working conditions had been improved. A reduction of cardiovascular load, as well as self-rated physical exertion, was noted and the work was perceived as substantially less stressful.
Journal of Occupational and Environmental Medicine, 2002
The aim of the study was to evaluate eight questions concerning physical loads, used in public he... more The aim of the study was to evaluate eight questions concerning physical loads, used in public health questionnaires. Working women and men (203) completed a self-administered questionnaire twice, following a test-retest method. The questions were also validated with a structured interview. Response agreement was calculated with Cohen's kappa statistics with quadratic weights (kappa w). Test-retest agreement varied from 0.74 to 0.92, and inter-method agreement from 0.38 to 0.81. The lowest coefficients were for the questions concerning bent/twisted work postures (kappa w 0.38) and repetitive movements (kappa w 0.39). The results did not indicate any substantial influence of gender, type of work or musculoskeletal complaint. The questions concerning general physical activity and sitting work postures, and physical exercise/sports during leisure times, had good validity. The questions concerning bent/twisted work posture and repetitive movements need to be re-designed.
Journal of Occupational and Environmental Medicine, 1995
In ergonomic epidemiology exposure to local loads as well as cardiovascular load may contribute t... more In ergonomic epidemiology exposure to local loads as well as cardiovascular load may contribute to general and local fatigue and musculoskeletal disease. Self-reported exposure is often the only feasible method in large population studies. The aim of this study was to evaluate retrospectively self-reported physical activity and perceived exertion as estimates of cardiovascular load during occupational work. The study population consisted of 39 men, representing 25 different occupations, and 58 women, representing 28 occupations. Ratings of physical exertion (RPE scale) and physical activity (Edholm scale transferred to multiples of the basal metabolic rate, METs) at the end of a work shift were correlated with the average heart rate during the same work shift. In the male population, both RPE ratings and METs correlated significantly (P < .01) with the average heart rate. No such correlation was observed in the female population.
International Journal of Industrial Ergonomics, 2002
The aim of the present study was to describe working conditions and the prevalence of musculoskel... more The aim of the present study was to describe working conditions and the prevalence of musculoskeletal symptoms among male and female VDU operators, and to assess associations between work-related physical and psychosocial exposures and neck and upper limb symptoms by gender. The study population comprised a variety of occupations from both private and public sectors. Data on physical and psychosocial exposures were collected by questionnaires, as were data on musculoskeletal symptoms. Univariate associations between exposures and symptoms affecting the neck and upper limbs were estimated by calculating the prevalence ratios with 95% confidence intervals. We also assessed the potential excess odds ratio attributable to interaction between gender and, one by one, exposure variable. Women (n ¼ 785) used the computer on average 3.9 h/day and men (n ¼ 498) 3.6. Variation of different work tasks was lower among females than among males. Nineteen per cent of the women and 12% of the men did >3 h of continued computer work without breaks (>10 min) at least twice a week. Twice as many women as men experienced high job strain (high demands and low decision latitude). A higher proportion of women than men reported symptoms X3 days the preceding month from the upper body, irrespective of body region. For many of the studied exposures the prevalence of symptoms in one or several body regions was increased with increasing exposure, indicating exposureresponse relationships. Duration of computer work was associated with symptoms among both men and women. Only among men, duration of work with a non-keyboard computer input device was associated with symptoms. Only among women, job strain was associated with symptoms. Time pressure was associated with higher prevalence of symptoms among women. Among men, time pressure was associated with lower prevalence of symptoms. Thus, the associations differed between the genders. Women experienced higher prevalence of symptoms than men in all body regions and they were more often exposed to physical and psychosocial conditions that in previous studies have been considered harmful, than men.
International Archives of Occupational and Environmental Health, 2007
Objectives The main aim of this study was to explore the associations between appraised leadershi... more Objectives The main aim of this study was to explore the associations between appraised leadership styles, psychosocial work factors and musculoskeletal pain among subordinates in four diVerent public service sectors from an epidemiological perspective. Methods A cross-sectional questionnaire study was conducted; data from 2,403 public sector employees in subordinate positions (86% women) were analysed. The appraised leadership styles were measured through items from a modiWed version of the CPE questionnaire (C change, P production/structure, E employee/relation). The structure validity of the CPE-model was examined by principal component analysis (PCA). Univariate and multivariate analyses of associations between levels of musculoskeletal pain and appraised leadership styles and with psychosocial work factors were conducted. Odds ratios (ORs) with conWdence intervals (CIs) of 95% were used as a measure of associations. Results There were small variations in the appraisals of the immediate manager among the subordinates. However, the associations between musculoskeletal pain and leadership styles varied according to sector. Poor appraisals (low scores) on "change" and "employee relation" dimensions were associated with high levels of musculoskeletal pain in two sectors: home and health care services. In the domestic catering services, poor appraisals of managers in the "production/structure" dimension had the strongest association with high levels of pain. In general, poor appraisals of the "change" dimension was most strongly associated with high levels of musculoskeletal pain. "High work demands" had the strongest association with high levels of pain, particularly among the men. Conclusions Poor appraisals of managers and their leadership styles were associated with high levels of musculoskeletal pain among both female and male subordinates in diVerent public service sectors. There is therefore a great need of further studies of the mechanisms behind the relationships between the leadership styles and their impact on health among the genders.
The purpose of this study was to investigate the prevalence of the excess of metabolic level (met... more The purpose of this study was to investigate the prevalence of the excess of metabolic level (metabolic demands in work exceeding one-third of the individual's aerobic capacity) of working men and women today and to describe the population whose metabolic level is exceeded. A second aim was to explore how externally assessed metabolic demands match with the physical function and capacity of working men and women in jobs with the lowest and the highest demands. The aerobic power of each individual (94 men and 94 women) was estimated from heart rate and workload in sub-maximal tests from dynamic legwork on a cycle ergometer. Physical activity was assessed using a task-oriented interview technique. Physical function was measured by tests of muscle endurance in arms, abdomen and legs, handgrip pressure, balance and coordination. The calculation of individual metabolic demands during a "typical working day" showed that 27% of the men and 22% of the women exceeded their metabolic level. The results indicate that the physical fitness is low or somewhat low for two-thirds of the 94 men and for more than one-half of the 94 women. Women in the group with the highest job demands had significantly lower muscle endurance in the abdomen and legs and worse coordination than women in the group with the lowest job demands. Metabolic demands in working life today remain high. This is reflected in a mismatch between individual physical capacity and the physical demands of work for 25% of the population.
Work postures and movements of the upper limb were analysed for 12 'mouse' operat... more Work postures and movements of the upper limb were analysed for 12 'mouse' operators and 12 'non-mouse' computer operators employed in word-processing work. Measurements were carried out during correction of a given text. 'Mouse' operators spent 64% of the working time with the operative wrist deviating more than 15 degrees towards the ulnar side, while 'non-mouse' operators spent 96% of the time with the corresponding wrist in neutral position towards radial deviation. The rotation in the shoulder was at all times in neutral position towards inward rotation for 'non-mouse' operators, while 'mouse' operators worked 81% of the time with the shoulder rotated outward more than 30 degrees. 'Mouse' operators corrected a longer text during the given time. Our observations showed long periods of strenuous working postures for 'mouse' operators compared to 'non-mouse' operators. We believe that further investigations need to be carried out on the effects of word-processing techniques and to develop ergonomic work station designs for the 'mouse' and other non-keyboard input devices.
Musculoskeletal disorders are more common among women than among men. When comparing the differen... more Musculoskeletal disorders are more common among women than among men. When comparing the difference between men and women in the prevalence of musculoskeletal disorders, methodological problems arise as men and women seldom perform the same type of activities, neither at work nor at home.
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Papers by Lena Karlqvist