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A comparison of lumbar spine and muscle loading between male and female workers during box transfers
There is a clear relationship between lumbar spine loading and back musculoskeletal disorders in manual materials handling. The incidence of back disorders is greater in women than men, and for similar work demands females are functioning closer to their physiological limit. It is crucial to study loading on the spine musculoskeletal system with actual handlers, including females, to better understand the risk of back disorders. Extrapolation from biomechanical studies conducted on unexperienced subjects (mainly males) might not be applicable to actual female workers. For male workers, expertise...
Occupational biomechanical risk factors for surgically treated ulnar nerve entrapment in a prospective study of male construction workers
Evidence was provided for forceful hand-grip work, with and without vibration, as a risk factor for ulnar nerve entrapment (UNE) surgery in a large cohort of Swedish construction workers. Several individual biomechanical factors comprising such work were associated with increased risk of UNE, including: increased grip force, upper extremity load, frequency of hand-held tool use, and hand arm vibration. Source: Jackson, J. A., Olsson, D., Punnett, L., Burdorf, A., Järvholm, B. et Wahlström, J. (2018). Scandinavian journal of work, environment & health . http://dx.doi.org/10.5271/sjweh...
The influence of job rotation and task order on muscle responses in females
Job rotation aims to reduce muscle fatigue by switching between functionally different tasks to theoretically lessen the risk of site-specific fatigue and work-related musculoskeletal disorders (WMSDs). The effectiveness of job rotation in mitigating the onset of muscle fatigue is partially known, but there is limited ergonomic data on female populations despite comparatively lower upper body strength and increased risk of WMSDs. Rotating between two functionally different tasks, continuing a single task, and varying task order were assessed in the present study for influence on muscle fatigue...
Visual and psychological stress during computer work in healthy, young females - physiological responses
Purpose: Among computer workers, visual complaints, and neck pain are highly prevalent. This study explores how occupational simulated stressors during computer work, like glare and psychosocial stress, affect physiological responses in young females with normal vision. Methods: The study was a within-subject laboratory experiment with a counterbalanced, repeated design. Forty-three females performed four 10-min computer-work sessions with different stress exposures: (1) minimal stress; (2) visual stress (direct glare); (3) psychological stress; and (4) combined visual and psychological stress...
Manual handling risks to midwives associated with birthing pools literature review and incident analysis
This report describes research into the manual handling related risks to midwives associated with providing care to women choosing to use a birthing pool for labour and/or birth at home and in hospital. The research comprised: a review of incidents reported to the Health and Safety Executive, a literature review and familiarisation visits to include discussions with midwives to identify current practices and procedures. The manual handling risks are likely to result from the position of the mother in the pool, as well as from the position of the midwife whilst undertaking tasks at the birthing...
Older females in the workforce
The effects of age on psychophysical estimates of maximum acceptable lifting loads This psychophysical study demonstrated that older female workers (aged 50–63 years) selected maximum acceptable lift masses that were (on average) 24% lower than younger workers (aged 20–32 years), which corresponded with lower grip strength and heart rate reserve. Current maximum acceptable lifting weights based on psychophysical information may not protect female workers greater than 50 years of age. Source: Chen, J. A., Dickerson, C. R., Wells, R. P., & Laing, A. C. (2017). Ergonomics , 1-34. http...
Difference between male and female workers lifting the same relative load when palletizing boxes
A few biomechanical studies have contrasted the work techniques of female and male workers during manual material handling (MMH). A recent study showed that female workers differed from males mostly in the strategy they used to lift 15-kg boxes from the ground, especially regarding task duration, knee and back postures and interjoint coordination. However, the lifting technique difference observed in females compared to males was perhaps due to a strength differences. The objective of this study was to test whether female workers would repeat the same lifting technique with a load adjusted to their...
The Impact of a Rigorous Multiple Work Shift Schedule and Day Versus Night Shift Work on Reaction Time and Balance Performance in Female Nurses
A Repeated Measures Study Objective: The aim of this study was to determine the impact of a demanding work schedule involving long, cumulative work shifts on response time and balance-related performance outcomes and to evaluate the prevalence of musculoskeletal disorders between day and night shift working nurses. Methods: A questionnaire was used to identify the prevalence of past (12-month) and current (7-day) musculoskeletal disorders. Nurses worked three 12-hour work shifts in a 4-day period. Reaction time and balance tests were conducted before and after the work period. Results: The work...
The Consequence of Combined Pain and Stress on Work Ability in Female Laboratory Technicians
A Cross-Sectional Study Musculoskeletal pain and stress-related disorders are leading causes of impaired work ability, sickness absences and disability pensions. However, knowledge about the combined detrimental effect of pain and stress on work ability is lacking. This study investigates the association between pain in the neck-shoulders, perceived stress, and work ability. In a cross-sectional survey at a large pharmaceutical company in Denmark 473 female laboratory technicians replied to questions about stress (Perceived Stress Scale), musculoskeletal pain intensity (scale 0–10) of the...
Occupational exposures and sick leave during pregnancy
Results from a Danish cohort study Objective: This study aimed to investigate associations between work postures, lifting at work, shift work, work hours, and job strain and the risk of sick leave during pregnancy from 10–29 completed pregnancy weeks in a large cohort of Danish pregnant women. Methods: Data from 51 874 pregnancies in the Danish National Birth Cohort collected between 1996–2002 were linked to the Danish Register for Evaluation of Marginalization. Exposure information was based on telephone interviews. Hazard ratios (HR) with 95% confidence intervals (95% CI) were calculated...
A Tailored Workplace Exercise Program for Women at Risk for Neck and Upper Limb Musculoskeletal Disorders
A Randomized Controlled Trial Objective: The aim of this study was to evaluate a tailored physical activity protocol performed in a work environment with a group of female workers employed in manual precision tasks to reduce upper limb pain. Methods: Sixty female subjects were randomly assigned to an intervention group or a control group. The IG was administered of a 6-month, twice-a-week, tailored exercise program, whereas the CG received no intervention. Results: The IG showed a reduction on shoulder pain accompanied by increases on the range of motion measures. In addition, reductions in upper...
A Tailored Workplace Exercise Program for Women at Risk for Neck and Upper Limb Musculoskeletal Disorders
A Randomized Controlled Trial Objective: The aim of this study was to evaluate a tailored physical activity protocol performed in a work environment with a group of female workers employed in manual precision tasks to reduce upper limb pain. Methods: Sixty female subjects were randomly assigned to an intervention group or a control group. The IG was administered of a 6-month, twice-a-week, tailored exercise program, whereas the CG received no intervention. Results: The IG showed a reduction on shoulder pain accompanied by increases on the range of motion measures. In addition, reductions in upper...
Musculoskeletal and neurological injuries associated with work organization among immigrant Latino women manual workers in North Carolina
BACKGROUND: This analysis examines the associations of work organization attributes among Latino women in manual occupations with musculoskeletal and neurological injuries. METHODS: Participants included 234 women in western North Carolina. Outcome measures included epicondylitis, rotator cuff syndrome, back pain, and carpal tunnel syndrome. Independent measures included indicators of job demand, job control, and job support, as well as personal characteristics. RESULTS: Latina workers commonly experienced epicondylitis, rotator cuff syndrome, back pain, and CTS. Awkward posture and decision latitude...
Predictors of sickness absence related to musculoskeletal pain
A two-year follow-up study of workers in municipal kitchens Objective : We studied predictors of sickness absences (SA) due to musculoskeletal pain over two years among 386 municipal female kitchen workers. Methods : Pain and SA periods (no/yes) due to pain in seven sites during the past three months were assessed at 3-month intervals over two years by questionnaire. Age, musculoskeletal pain, multisite pain (pain in ≥3 sites), musculoskeletal and other somatic diseases, depressive symptoms, physical and psychosocial workload, body mass index, smoking, and leisure-time physical activity (LTPA...
Personal and workplace psychosocial risk factors for carpal tunnel syndrome: a pooled study cohort
Background Between 2001 and 2010, six research groups conducted coordinated multiyear, prospective studies of carpal tunnel syndrome (CTS) incidence in US workers from various industries and collected detailed subject-level exposure information with follow-up symptom, physical examination, electrophysiological measures and job changes. Objective This analysis of the pooled cohort examined the incidence of dominant-hand CTS in relation to demographic characteristics and estimated associations with occupational psychosocial factors and years worked, adjusting for confounding by personal risk factors...
The demographic and contextual correlates of work-related repetitive strain injuries among Canadian men and women
Background The study sought to identify gender differences in work-related repetitive strain injuries (RSI), as well as examine the degree to which non-work factors such as family roles interact with gender to modify RSI risk. Another aim is to examine whether there are potential provincial differences in work-related RSI risk. Methods The 2003/2005 Canadian Community Health Survey included over 89,000 respondents who reported working in the past 12 months. Separate multi-level models for men and women were used to identify the correlates of work-related RSIs. Results Women reported sustaining...
Nouveau numéro de PISTES
Dans ce numéro, intitulé « Passerelle », il sera question du geste, utile à la fois pour mieux comprendre l’activité en situation de travail et pour agir sur la prévention durable des TMS. Deux contributions s’intéressent aux guides en santé et en sécurité du travail agissant comme relais de connaissances. Les changements organisationnels sont aussi scrutés au regard du bien-être émotionnel au travail. Le lecteur est également invité à prendre connaissance d’un nouvel...
Tenir au travail (dossier)
Ce dossier illustre les questionnements théoriques et méthodologiques que suscite la prise en compte de la dimension genre dans l'activité de travail. C. Teiger et F. Vouillot posent le constat du développement exponentiel des troubles musculo-squelettiques qui touchent beaucoup plus fréquemment les femmes et d'une augmentation des accidents de travail chez ces dernières alors qu'ils diminuent chez les hommes. Sont en cause l'activité de travail et ses conditions matérielles et organisationnelles, associées aux contraintes...
Risk of neck musculoskeletal disorders among males and females in lifting exertions
Work-related neck disorders are common among various occupational groups. Despite clear epidemiological evidence for the association of these disorders with forceful arm exertions, the effect of such exertions on the biomechanical behavior of the neck muscles is currently not well understood. In this study, the effect of lifting tasks on the biomechanical loading of neck muscles was investigated for males and females. Twenty-six participants (13 males and 13 females) performed bi-manual isometric lifting tasks at knuckle, elbow, shoulder, and overhead heights by exerting 25%, 50%, and 75% of their...
Occupational lifting during pregnancy and risk of fetal death in a large national cohort study
Objective The aim of the present study was to examine the association between occupational lifting and the risk of fetal death according to gestational age. Methods We used data from the Danish National Birth Cohort (1996–2002). Among 71 500 occupationally active women, 2886 experienced a fetal death. Information on lifting and relevant covariates was collected in interviews around week 16 of pregnancy. The majority of fetal losses (N=2032) happened before the scheduled interview, and exposure data were collected retrospectively from these women. We analyzed early miscarriage (≤12 weeks...
Les femmes manutentionnaires - Un point de vue biomécanique et ergonomique
Les manutentionnaires encourent des risques très élevés de blessures au dos. Afin de trouver des solutions à ce problème chronique, l’IRSST subventionne une programmation de recherche sur la manutention. Un premier projet issu de cette programmation a comparé les méthodes de travail des manutentionnaires experts et novices masculins et a dégagé des principes de manutention qui serviront de guide à l’élaboration d’un programme de formation. Le présent projet se penchera sur l’étude...
Qu'est-ce qui fait la pénibilité d'une posture contraignante ?
Une exploration à partir des données 2009-2010 du dispositif Evrest La pénibilité est entrée dans le débat social en tant qu’élément justifiant une éventuelle différenciation des conditions de départ en retraite. Les incapacités faisant suite à l’exposition à certaines contraintes seraient l’un des critères pris en compte pour justifier des départs plus précoces, mais aussi pour fonder une démarche de prévention. Source : http://evrest.istnf.fr/_admin...
Comparison of posture and muscle control pattern between male and female computer users with musculoskeletal symptoms
The primary purpose of this study was to compare the posture and muscle control patterns between male and female computer users with musculoskeletal symptoms. Forty computer users were recruited. Each subject performed a preferred speed typing, a fast speed typing, and a repetitive mouse task. The independent variables were gender, typing speed, and time. There were significant differences between genders for head and neck flexion angles when they were performing the preferred speed typing task. Significant differences between genders were also found for upper extremity angles when they were performing...
Occupational lifting and pelvic pain during pregnancy
A study within the Danish National Birth Cohort Objectives : Pelvic pain during pregnancy is a common ailment, and the disease is a major cause of sickness absence during pregnancy. It is plausible that occupational lifting may be a risk factor of pelvic pain during pregnancy, but no previous studies have examined this specific exposure. The aim of this study was to examine the association between occupational lifting and pelvic pain during pregnancy. Methods : The study comprised 50 143 pregnant women, enrolled in the Danish National Birth Cohort in the period from 1996–2002. During pregnancy...
Risk factors for incidence of rotator cuff syndrome in a large working population
Objectives: The aim of this study was to assess the effects of personal and work-related factors on the incidence of rotator cuff syndrome (RCS) in a large working population. Methods: A total of 3710 French workers were included in a cross-sectional study in 2002–2005. All completed a self-administered questionnaire about personal factors and work exposure. Using a standardized physical examination, occupational physicians established a diagnosis of RCS. Between 2007–2010, 1611 workers were re-examined. Associations between RCS and risk factors at baseline were analyzed by logistic...
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