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Sex Differences in Glenohumeral Muscle Activation and Coactivation During a Box Lifting Task
Manual material handling is associated with shoulder musculoskeletal disorders, especially for women. Sex differences in glenohumeral muscle activity may contribute to women's higher injury risk by affecting shoulder load and stability. We assessed the effects of sex (25 women vs 26 men) and lifting load (6 kg vs 12 kg) on muscle activation during box lifting from hip to eye level. Surface and intramuscular electromyography were recorded from 10 glenohumeral muscles. Most muscles were more activated for the heavier box and for women. These effects were larger for “prime...
Bi-directional relation between effort-reward imbalance and risk of neck-shoulder pain
Assessment of mediation through depressive symptoms using occupational longitudinal data Objectives: Bi-directional associations between perceived effort?reward imbalance (ERI) at work and neckshoulder pain have been reported. There is also evidence of associations between ERI and depressive symptoms, and between depressive symptoms and pain while the links between ERI, depressive symptoms and pain have not been tested. We aimed to assess whether depressive symptoms mediate the association between ERI and neck-shoulder pain, as well as the association between neck-shoulder pain and ERI. Methods...
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...
Effects of standing on typing task performance and upper limb discomfort, vascular and muscular indicators
Standing is a popular alternative to traditionally seated computer work. However, no studies have described how standing impacts both upper body muscular and vascular outcomes during a computer typing task. Twenty healthy adults completed two 90-min simulated work sessions, seated or standing. Upper limb discomfort, electromyography (EMG) from eight upper body muscles, typing performance and neck/shoulder and forearm blood flow were collected. Results showed significantly less upper body discomfort and higher typing speed during standing. Lower Trapezius EMG amplitude was higher during standing...
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...
Effects of work surface and task difficulty on neck-shoulder posture and trapezius activity during a simulated mouse task
Objectives. The purpose of this study is to evaluate the influence of the work surface and task difficulty on the head, upper back and upper arm postures and activity of the descending trapezius during a simulated mouse task. Methods. Healthy female university students (N = 15) were evaluated. The work surface was positioned at elbow height (EH) and above elbow height (AEH) and the task difficulty was set at low (LD) and high (HD) levels. The postures were recorded by inclinometers. Trapezius activity was normalized by the maximum voluntary isometric contraction (MVIC). Results. Significantly...
Can beliefs about musculoskeletal pain and work be changed at the national level?
Prospective evaluation of the Danish national Job & Body campaign Using a mixture of networking activities, workplace visits and a mass media campaign, the Danish national Job & Body health campaign improved beliefs about musculoskeletal pain and work among public-sector employees in Denmark. Intensive and long-term national campaigns may be a strategically important tool against musculoskeletal disorders and their consequences in the population. Source: Andersen, L. L., Geisle, N., & Knudsen, B. (2017). Scand J Work Environ Health . http://dx.doi.org/10.5271/sjweh.3692
Time course of neck-shoulder pain among workers
A longitudinal latent class growth analysis Objectives: The aims of this study were to (i) identify trajectories of neck-shoulder pain (NSP) over one year in an occupational population and (ii) determine whether these trajectories are predicted by NSP characteristics as well as personal and occupational factors at baseline. Methods: This longitudinal study was conducted among Danish workers (N=748) from 2012–2014. Text messages were used to collect frequent data on NSP over one year (14 waves in total). Peak NSP intensity in the past month was rated on a 0–10 numeric scale. A baseline...
Integration of active pauses and pattern of muscular activity during computer work
Submaximal isometric muscle contractions have been reported to increase variability of muscle activation during computer work; however, other types of active contractions may be more beneficial. Our objective was to determine which type of active pause vs. rest is more efficient in changing muscle activity pattern during a computer task. Asymptomatic regular computer users performed a standardised 20-min computer task four times, integrating a different type of pause: sub-maximal isometric contraction, dynamic contraction, postural exercise and rest. Surface electromyographic (SEMG) activity was...
Psychosocial work stress, leisure time physical exercise and the risk of chronic pain in the neck/shoulders
Longitudinal data from the Norwegian HUNT Study Objectives: To prospectively investigate if the risk of chronic neck/shoulder pain is associated with work stress and job control, and to assess if physical exercise modifies these associations. Material and Methods: The study population comprised 29 496 vocationally active women and men in the Norwegian Nord-Trøndelag Health Study (HUNT Study) without chronic pain at baseline in 1984–1986. Chronic neck/shoulder pain was assessed during a follow-up in 1995–1997. A generalized linear model (Poisson regression) was used to calculate...
Psychosocial Factors Related to Lateral and Medial Epicondylitis
Results From Pooled Study Analyses Objective: The goal is to assess the relationships between psychosocial factors and both medial and lateral epicondylitis after adjustment for personal and job physical exposures. Methods: One thousand eight hundred twenty-four participants were included in pooled analyses. Ten psychosocial factors were assessed. Results: One hundred twenty-one (6.6%) and 34 (1.9%) participants have lateral and medial epicondylitis, respectively. Nine psychosocial factors assessed had significant trends or associations with lateral epicondylitis, the largest of which was between...
The biomechanical demands of manual scaling on the shoulders & neck of dental hygienists
The purpose of this study was to evaluate the postural and muscular demands placed on the shoulders and neck of dental hygienists when performing a simulated manual scaling task. Nineteen healthy female dental hygienists performed 30-min of simulated manual scaling on a manikin head in a laboratory setting. Surface electromyography was used to monitor muscle activity from several neck and shoulder muscles, and neck and arm elevation kinematics were evaluated using motion capture. The simulated scaling task resulted in a large range of neck and arm elevation angles and excessive low-level muscular...
Temporal patterns of sitting at work are associated with neck–shoulder pain in blue-collar workers
A cross-sectional analysis of accelerometer data in the DPHACTO study BACKGROUND: Our aim was to examine the extent to which temporal patterns of sitting during occupational work and during leisure-time, assessed using accelerometry, are associated with intense neck-shoulder pain (NSP) in blue-collar workers. METHODS: The population consisted of 659 Danish blue-collar workers. Accelerometers were attached to the thigh, hip, trunk and upper dominant arm to measure sitting time and physical activity across four consecutive days. Temporal sitting patterns were expressed separately for work and leisure...
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...
Santé, prévention de la pénibilité et parcours professionnel
Les 33es Journées nationales du bâtiment et des travaux publiques (BTP), organisées conjointement par l'AMCO-BTP de Limoges (Association médicale du Centre-Ouest) et le GNMST-BTP (Groupement national multidisciplinaire de santé au travail dans le BTP), avec le soutien de l'Organisme professionnel de prévention du BTP (OPPBTP), se sont déroulées à Limoges du 27 au 29 mai 2015 sur le thème de la pénibilité et de ses conséquences sur l'épaule et le rachis. De nombreuses démarches de...
Effectiveness of workplace interventions in the prevention of upper extremity musculoskeletal disorders and symptoms
An update of the evidence The burden of disabling musculoskeletal pain and injuries (musculoskeletal disorders, MSDs) arising from work-related causes in many workplaces remains substantial. There is little consensus on the most appropriate interventions for MSDs. Our objective was to update a systematic review of workplace-based interventions for preventing and managing upper extremity MSD (UEMSD). We followed a systematic review process developed by the Institute for Work & Health and an adapted best evidence synthesis. 6 electronic databases were searched (January 2008 until April 2013 inclusive...
Association between objectively measured sitting time and neck–shoulder pain among blue-collar workers
Objectives: Prolonged sitting has been suggested as a risk factor for neck–shoulder pain (NSP). Using a cross-sectional design, we investigated the extent to which objectively measured time sitting is associated with NSP among blue-collar workers. Methods: Sitting time was measured during multiple working days on male (n = 118) and female (n = 84) blue-collar workers (n = 202) using triaxial accelerometers (Actigraph) placed on the thigh and trunk. Workers were categorized into having, on average, a low, moderate or high sitting time, with mean values (SD between subjects) of 4.9 (1.0), 7...
L’évaluation clinique, les traitements et le retour en emploi de travailleurs souffrant d’atteintes de la coiffe des rotateurs
Bilan des connaissances Les atteintes musculosquelettiques de l'épaule constituent une problématique importante au sein de la population générale, et particulièrement chez les travailleurs. Ce type d'atteintes affecte le statut fonctionnel de l'épaule et la qualité de vie des personnes et peut entrainer, chez les travailleurs, des problématiques d'absentéisme ou des pertes de productivité. Les travailleurs effectuant des tâches avec les bras au-dessus des épaules ou des tâches répétitives...
Association between objectively measured sitting time and neck–shoulder pain among blue-collar workers
OBJECTIVES: Prolonged sitting has been suggested as a risk factor for neck-shoulder pain (NSP). Using a cross-sectional design, we investigated the extent to which objectively measured time sitting is associated with NSP among blue-collar workers. METHODS: Sitting time was measured during multiple working days on male (n = 118) and female (n = 84) blue-collar workers (n = 202) using triaxial accelerometers (Actigraph) placed on the thigh and trunk. Workers were categorized into having, on average, a low, moderate or high sitting time, with mean values (SD between subjects) of 4.9 (1.0), 7.3 (0...
Lasting effects of workplace strength training for neck/shoulder/arm pain among laboratory technicians
Natural experiment with 3-year follow-up Objectives . This study investigated long-term effects and implementation processes of workplace strength training for musculoskeletal disorders. Methods . 333 and 140 laboratory technicians from private and public sector companies, respectively, replied to a 3-year follow-up questionnaire subsequent to a 1-year randomized controlled trial (RCT) with high-intensity strength training for prevention and treatment of neck, shoulder, and arm pain. Being a natural experiment, the two participating companies implemented and modified the initial training program...
Cinématique et modélisation biomécanique de l’épaule lors de tâches de manutention
De récentes revues de la littérature épidémiologique montrent que travailler avec les bras en position levée augmente la probabilité de développer des troubles musculosquelettiques (TMS) aux épaules. Bien que l’origine et les mécanismes de TMS à l’épaule manquent d’évidence dans la littérature scientifique, réaliser une tâche avec les bras en position levée cause un chargement de la musculature de l’épaule plus important. Cependant, peu d’éléments...
A longitudinal study on risk factors for neck and shoulder pain among young adults in the transition from technical school to working life
Objectives: The study examined the course of neck and shoulder pain among a cohort of technical school students entering working life. We also aimed to identify work-related and individual risk factors for neck and shoulder pain during this transition period. Methods: The study was designed as a prospective cohort study following 420 technical school students (167 student hairdressers, 118 student electricians, and 135 media/design students) from school, through their apprenticeship and into working life. Every 4th month over a 6.5 year period (2002–2009), the participant`s neck and shoulder...
Shoulder muscle loading and task performance for overhead work on ladders versus mobile elevated work platforms
A high incidence of Musculoskeletal Disorders (MSDs) has been reported in the construction sector. The use of ladders in the workplace has long been identified as a significant risk that can lead to workplace accidents. However, it is unclear if platform types have an effect on the physical risk factors for MSDs in overhead work. The aim of this study is to perform a pilot study on the effects of hand activity on both shoulder muscle loading and task performance while working on ladders versus Mobile Elevated Working Platforms (MEWPs). It is hypothesised that work on ladders would result in greater...
Développement d’un indice radiologique représentatif de la fonction de l’épaule chez des travailleurs souffrant de rupture de la coiffe des rotateurs
Les problèmes chroniques de douleur et de perte de fonction de l'épaule touchent jusqu'à 20 % des adultes (Pope, Croft et coll., 1997). La proportion serait encore plus élevée chez les adultes âgés de plus de 50 ans. Au Québec, la Commission de la santé et de la sécurité au travail du Québec (CSST) rapporte que, pour les années 2003 à 2006, les lésions à l'épaule représentaient 39% des 32 549 lésions inflammatoires dues à un travail répétitif...
Cost-efficient assessment of biomechanical exposure in occupational groups, exemplified by posture observation and inclinometry
Objectives : This study compared the cost efficiency of observation and inclinometer assessment of trunk and upper-arm inclination in a population of flight baggage handlers, as an illustration of a general procedure for addressing the trade-off between resource consumption and statistical performance in occupational epidemiology. Methods : Trunk and upper-arm inclination with respect to the line of gravity were assessed for three days on each of 27 airport baggage handlers using simultaneous inclinometer and video recordings. Labor and equipment costs associated with data collection and processing...
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