Differential effects of mental concentration and acute psychosocial stress on cervical muscle activity and posture. Impact of regular relaxation training and psychosocial working factors on neck-shoulder tension and absenteeism in hospital cleaners. The effects of neck–shoulder pain development on sensory–motor interactions among female workers in the poultry and fish industries. A prospective study A Tailored Workplace Exercise Program for Women at Risk for Neck and Upper Limb Musculoskeletal Disorders: A Randomized Controlled Trial A randomised controlled trial evaluating the effects of two workstation interventions on upper body pain and incident musculoskeletal disorders among computer operators Differential effects of mental load on proximal and distal arm muscle activity Job task and psychosocial risk factors for work-related musculoskeletal disorders among newspaper employees. The influence of working conditions and individual factors on the incidence of neck and upper limb symptoms among professional computer users Tension neck and evaluation of a physical training course among office workers in a bank corporation. Upper trapezius muscle activation patterns in neck–shoulder pain patients and healthy controls Effects of a workplace physical exercise intervention on the intensity of headache and neck and shoulder symptoms and upper extremity muscular strength of office workers: A cluster randomized controlled cross-over trial Impact of a Web-Based Stress Management and Health Promotion Program on Neck-Shoulder-Back Pain in Knowledge Workers? 12 Month Prospective Controlled Follow-Up Effects of an exercise programme on preventing neck pain among office workers: a 12-month cluster-randomised controlled trial The effectiveness of a work style intervention and a lifestyle physical activity intervention on the recovery from neck and upper limb symptoms in computer workers Work Related Risk Factors for Neck, Shoulder and Arms Complaints: A Cohort Study Among Dutch Computer Office Workers Effect of two contrasting types of physical exercise on chronic neck muscle pain. Prognostic Factors for Intervention Effect on Neck/Shoulder Symptom Intensity and Disability among Female Computer Workers
Physical and psychosocial stressors in the workplace have been independently associated with the development of  neck pain  , yet interactions among these risk factors remain unclear . The purpose of this study was to compare the effects of mentally challenging computer work performed with and without exposure to a psychosocial stressor on cervical muscle activity and posture . Changes in cervical posture and electromyography of upper trapezius , cervical extensor , and sternocleidomastoid muscles were compared between a resting seated posture at baseline , a low stress condition with mental concentration , and a high stress condition with mental concentration and psychosocial stress in sixty healthy office workers .  Forward head posture significantly increased with mental concentration compared to baseline , but did not change with further introduction of the stressor . Muscle activity significantly increased from the low stress to high stress condition for both the dominant and non-dominant upper trapezius , with no corresponding change in activity of the cervical extensors or flexors between stress conditions . These findings suggest that upper trapezius muscles are selectively activated by psychosocial stress independent of changes in concentration or posture , which may have implication s for the prevention of stress-related trapezius myalgia in the workplace Occupational stress in hospital cleaners ( n = 50 ) , and the effect of relaxation training ( n = 25 , age matched , r and omized ) , were studied by recording the electrical activity of the upper trapezius muscle at rest and during working conditions at the beginning , middle , and end of a 6-month follow-up period . A short ( 15-minute ) relaxation program was practice d daily at the workplace to provide stress management . The amount of sick leave was counted , and the extent of depression and some psychosocial working factors were screened . Intercorrelations were found between the neck-shoulder tension , psychosocial factors , depression , and the absentee rate . The relaxation training  diminished tension in the neck-shoulder region efficiently ; nevertheless , the decrease in absenteeism might have been related mainly to the social support offered by the research maneuver itself Abstract Objectives . The purpose of this prospect i ve laboratory study was to follow newly employed workers in the fish or poultry industry for 6 months and investigate possible changes in sensory manifestations and motor performance during low load , repetitive work simulation . It was investigated whether the changes were an effect of employment duration and of development of neck – shoulder complaints . Methods . Twelve newly employed female filleting employees without any sign of neck – shoulder tenderness/pain at the time of employment of 0 months took part in two laboratory recording sessions planned within 1 month of employment and after 6 months of employment at the plant . After 6 months , six workers out of 12 had developed pain and /or tenderness in the neck – shoulder region . The recording sessions evaluated sensory-motor aspects by measuring pressure pain threshold , work-task timing , cutting forces , surface electromyographic activity of four shoulder muscles , displacement of the centre of pressure , and 3D movements of the arm and trunk during simulation of low load , repetitive filleting . Results . Effects due to the duration of employment were observed in both groups , i.e. decreased sensibility to pressure , decrease in the duration of the work cycle , increased arm starting position with respect to the upright position , and decreased range of motion of the arm and trunk ( P<0.05 ) after 6 months . Among the workers with neck – shoulder complaints , increased sensibility to pressure , lower force level , higher electromyographic activity , decreased amplitude of arm movement , and increased trunk posture and movement amplitude ( P<0.05 ) were observed , compared with workers without complaints . Conclusions . Differences in terms of sensory manifestations and motor control strategy were seen after 6 months of employment with or without neck – shoulder complaints . In general , changes in sensory manifestations and motor control strategy after 6 months work were most likely of importance , as they underlined a learning process as employment duration increased . Moreover , the present sensory – motor changes observed among workers with neck – shoulder complaints highlighted the potential physical risk factors associated with low load , repetitive work 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 r and omly 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 limb pain and neck disability were detected with concomitant increases in grip strength . Conclusions : This study indicated positive effects of a tailored workplace exercise protocol in female workers exposed to moderate risk for work-related musculoskeletal disorders , showing clinical ly meaningful reductions of pain symptoms and disability on upper limb and neck regions Background : Call centre work with computers is associated with increased rates of upper body pain and musculoskeletal disorders . Methods : This one year , r and omised controlled intervention trial evaluated the effects of a wide forearm support surface and a trackball on upper body pain severity and incident musculoskeletal disorders among 182 call centre operators at a large healthcare company . Participants were r and omised to receive ( 1  ) ergonomics training only , ( 2 ) training plus a trackball , ( 3 ) training plus a forearm support , or ( 4 ) training plus a trackball and forearm support . Outcome measures were weekly pain severity scores and diagnosis of incident musculoskeletal disorder in the upper extremities or the neck/shoulder region based on physical examination performed by a physician blinded to intervention . Analyses using Cox proportional hazard models and linear regression models adjusted for demographic factors , baseline pain levels , and psychosocial job factors . Results : Post-intervention , 63 participants were diagnosed with one or more incident musculoskeletal disorders  . Hazard rate ratios showed a protective effect of the armboard for neck/shoulder disorders ( HR = 0.49 , 95 % CI 0.24 to 0.97 ) after adjusting for baseline pain levels and demographic and psychosocial factors . The armboard also significantly reduced neck/shoulder pain ( p = 0.01 ) and right upper extremity pain ( p = 0.002 ) in comparison to the control group . A return-on-investment model predicted a full return of armboard and installation costs within 10.6 months . Conclusion : Providing a large forearm support combined with ergonomic training is an effective intervention to prevent upper body musculoskeletal disorders and reduce upper body pain associated with computer work among call centre employees Work-related upper extremity disorders ( WRUEDs ) that result from keyboarding  tasks are prevalent and costly . Although the precise mechanisms causing the disorder are not yet fully understood , several risk factors have been proposed . These include the repetitive nature of the motor task and the associated sustained static working postures , but also more psychological factors such as mental load . Epidemiological surveys have shown that WRUEDs are more prone to develop in the postural muscles of the neck/shoulder area than in the executive muscles controlling the h and . The present study investigated whether the activation patterns of these two muscle types are differentially affected by an additional mental load during the performance of a repetitive tapping task .  Participants tapped various keying patterns with their dominant index finger at two prescribed tempi . Mental load was manipulated by means of an auditory short-term memory task . We recorded the  EMG activity of two neck/shoulder muscles ( trapezius and deltoid ) , two upper arm muscles ( biceps and triceps ) , and four forearm muscles ( flexor digitorum superficialis , extensor digitorum , extensor carpi radialis longus and extensor carpi ulnaris ) and analyzed the kinematics and impact forces of the index finger . The results confirmed that the upper limb has two functions . Specifically , activity of the executive distal musculature was increased during tapping at the higher pace , while the activity of the postural upper limb musculature was elevated due to the memory task . We argue that continuously increased muscular activity can lead to fatigue and thus eventually cause musculoskeletal complaints . The results are discussed with respect to biomechanical adaptation strategies that deal with the consequences of increased noise in the neuromotor system due to enhanced mental processing OBJECTIVES A cross-sectional study was conducted to assess the association of upper extremity musculoskeletal disorders and work-related factors among employees using video display terminals at a large metropolitan newspaper . METHODS The study included 1050 r and omly selected workers from four departments . The workers were asked to complete question naires on symptoms , job tasks , and psychosocial and work organization conditions . Musculoskeletal disorders of the upper extremities were defined by frequency , duration , and intensity of symptoms not attributable to acute injury . Data were analyzed with the use of logistic regression . RESULTS A total of 973 workers completed the survey . The one-year period prevalence rate for any musculoskeletal disorder of the upper extremities was 41 % . Neck symptoms ( 26 % ) were the most frequently reported , followed by h and or wrist ( 22 % ) , shoulder ( 17 % ) , and elbow ( 10 % ) symptoms . Greater time working at the video display station was associated with increased h and or wrist symptoms in a dose-response relationship . In addition , variables corresponding to increased work-load dem and s ( eg , increased time working under deadline and increased job pressure ) were associated with increased neck , shoulder , and h and or wrist disorders . Women were more likely to report symptoms in several areas , but this finding may reflect the concentration of women in jobs involving more risk factors . CONCLUSIONS The results suggest a high prevalence of musculoskeletal disorders of the upper extremities among newspaper employees , and they provide additional evidence that increased work load , time pressure , and greater hours of computer use are related to the occurrence of work-related musculoskeletal disorders among these workers , particularly for disorders in the h and or wrist area Objectives To assess the influence of working conditions and individual factors on the incidence of neck and upper limb symptoms among professional computer users . Methods The study is a prospect i ve cohort study with an observation period of 10 months . A baseline question naire about symptoms in the neck , shoulder and arm/h and during previous month , individual factors , work content , physical and psychosocial work-related exposures was answered by 1,283 computer operators ( response rate 84 % ) . Incidence data were collected by ten monthly question naires regarding the occurrence of symptoms categorized into three gross body regions : neck , shoulders and arms/h and s. A case , in the specific gross body region , was defined as a subject who was classified as non-symptomatic in that region at baseline or during minimum one follow-up period and later reported symptoms ( ≥3 days ) . Univariable and multivariable incidence rate ratios with 95 % confidence intervals for first occurrence of neck , shoulder and arm/h and cases , respectively , were calculated with Cox regression analysis . Results The incidence rate was 67 , 41 and 47 cases per 100 person years for neck , shoulder and arm/h and symptoms , respectively . In the multivariable analyses , comfort of the computer work environment and gender were related to the incidence of symptoms in all body regions ( RR = 1.5–1.9 for low comfort and 1.8–2.1 for females , respectively ) . Duration of mouse use predicted arm/h and symptoms ( RR = 1.7 for ≥3 h/day ) and job strain ( high dem and s and low decision latitude ) predicted neck symptoms ( RR = 1.6 and 2.2 for medium and high strain , respectively ) . Additionally , age was related to neck and shoulder symptoms . Conclusion Preventive strategies to reduce neck and upper limb symptoms among computer users should include measures to reduce mouse use  , to increase the comfort of the work environment and to reduce job strain . Although the effect estimates were relatively weak to moderate , preventive measures may have a marked impact on the incidence of neck and upper limb symptoms in the general population because of the widespread use of computers in working life as well as at home The purpose of this study was to investigate the effects of a physical training course in a group of patients ( n = 74 ) suffering from chronic tension neck . All participants in the course were employed by a bank corporation in Helsinki , Finl and . A comparable control group ( n = 77 ) consisted of office workers with tension neck from the same bank corporation who did not attend any training course . The outcome was analysed 6 months after the course . Pain and disability in the neck and shoulder region did not vary significantly between the group which participated in the training course and the control group . The experimental group had increased the amount of physical workout  compared to the control group ( 83.7 % vs 69.0 % , P = 0.0448 ) . Also , regarding the frequency of relaxation and stretching exercises the two groups differed significantly : the experimental group had continued to perform exercises more often ( P = 0.0434 ) . The frequency of sick leave days did not significantly differ between the groups , but the office workers in the experimental group had more periods of extended sick leave ( > 10 days ) and the controls had more frequent short sick leaves . The experimental group did increase their physical workout significantly compared with the controls , but no differences were detected regarding pain and disability . In order to gain more benefit more attention should be paid to the educational part of the training courses in order to enhance the patients ' self-care abilities . Also , strategies to alleviate psychosocial problems and organized relaxation exercises could decrease muscle tension in the neck in office workers This study aim ed at investigating whether patients with neck – shoulder complaints from different aetiologies ( work-related musculo-skeletal disorders , WMSD ; whiplash associated disorders , WAD ) show comparable muscle activation patterns , characterised by higher activation and lower relaxation levels of the trapezius muscles compared to healthy controls . Twenty healthy controls , 21 WMSD and 20 WAD patients with non-acute neck-shoulder pain were recruited for this cross-sectional study .  Surface electromyography ( sEMG ) recordings were performed at the upper trapezius muscles during reference contractions , st and ardised computer tasks ( typing and unilateral stress task ) , and rest measurements . sEMG was continuously recorded during these measurements .  Outcome measures were root mean square ( RMS ) to study muscle activity , and relative rest time ( RRT ) to study muscle relaxation . Statistical analysis comprised the bootstrap technique and Kruskall – Wallis tests . Results showed no clear evidence for abnormal muscle activation patterns in WMSD and WAD patients compared to healthy controls . However , a tendency was observed for higher RMS levels during the reference contractions and computer tasks in both patient groups compared to healthy controls , and lower RRT levels at the non-dominant side during stress . Both patient groups also showed larger variability in RMS and RRT values . This variability has more often been reported in literature and may suggest the existence of subgroups of pain patients with corresponding different muscle activation patterns not related to aetiology . Future research may focus on identifying these subgroups of patients with neck-shoulder pain & NA ; The purpose of the study was to examine the effects of a workplace physical exercise intervention on the perceived intensity of headache and the intensity of symptoms in the neck and shoulders , as well as on the extension and flexion strength of the upper extremities . The study was a cluster r and omized controlled trial . The cross‐over design consisted of physical exercise intervention ( 15 weeks ) and no‐intervention ( 15 weeks ) . The subjects ( n=53 ) were office workers ( mean age 46.6 ( SD 8.4 ) ) who reported headache ( n=41 ) symptoms in the neck ( n=37 ) or shoulders ( n=41 ) , which had restricted their daily activities during the last 12 months . Pain symptoms were measured using the Borg CR10 scale and muscular strength with a 5RM test . Statistical analyses were based on linear mixed models . Physical exercise intervention result ed in a slight , but statistically significant , decrease in the intensity of headache and neck symptoms , as well as an increase in the extension strength of the upper extremities . The mean decrease in headache during the 5‐week period was 0.64 CR10 ( 95 % CI 0.28–1.00 ) ( P=0.001 ) or 49 % ( 95 % CI 22–77 ) , and 0.42 CR10 ( 95 % CI 0.11–0.72 ) ( P=0.002 ) or 49 % ( 95 % CI 13–85 ) in the intensity of neck symptoms . The mean increase in the extension strength of the upper extremities was 1.3 kg ( 95 % CI 0.5–2.1 ) ( P=0.001 ) or 4 % ( 95 % CI 1–6 ) . The intervention had no effect on the intensity of shoulder symptoms or the flexion strength of the upper extremities . Specific exercise may be clinical ly important to alleviate headache and neck symptoms Objective : To evaluate the influence of a web-based stress management program on  neck – shoulder – back pain and perceived pain-relatedness to stress in a prospect i ve and controlled study . Methods : Study points were baseline , after 6 months intervention and at 12 months follow-up on 226 news media employees in two study groups and one control group . Results : Between groups no significant differences were found at any study point . Within groups , the study group with less intensive program improved in pain-relatedness to stress at follow-up . Between baseline and after intervention , the group with more intensive program showed decreased low back pain , and the control group showed less pain-relatedness to stress . Within group differences varied according to pain localization and were inconsistent . Conclusion : Present web-based stress management program did not influence neck-shoulder-back pain or perceived pain-relatedness to stress in stress-intensive occupations Objectives This study aim ed to evaluate the effects of an exercise programme focusing on muscle stretching and endurance training on the 12-month incidence of neck pain in office workers . Methods A 12-month prospect i ve cluster-r and omised controlled trial was conducted in healthy office workers with lower-than-normal neck flexion movement or neck flexor endurance . Participants were recruited from 12 large-scale enterprises . A total of 567 healthy office workers were r and omly assigned at the cluster level into either intervention ( n=285 ) or control ( n=282 ) groups . Participants in the intervention group received an exercise programme that included daily stretching exercise and twice-a-week muscle endurance training . Those in the control group received no intervention . The primary outcome measure was the 12-month incidence of neck pain , and the secondary outcome measures were pain intensity , disability level , and quality of life and health status . Analyses were performed using the Cox proportional hazard models . Results Over the 12-month follow-up , 12.1 % of participants in the intervention group and 26.7 % in the control group developed incident neck pain . Hazard rate ratios showed a protective effect of the exercise programme for neck pain ( HR=0.45 , 95 % CI 0.28 to 0.71 ) after adjusting for biopsychosocial factors . There was no significant difference in pain intensity , disability and quality of life and health status between those who reported incident neck pain in the intervention and control groups . Conclusions The exercise programme reduced incident neck pain and increased neck flexion movement for office workers with lower-than-normal neck flexion movement Abstract This study assessed the effectiveness of a single intervention targeting work style and a combined intervention targeting work style and physical activity on the recovery from neck and upper limb symptoms . Computer workers with frequent or long‐term neck and upper limb symptoms were r and omised into the work style group ( WS , n = 152 ) , work style and physical activity group ( WSPA , n = 156 ) , or usual care group ( n = 158 ) . The WS and WSPA group attended six group meetings . All meetings focused on behavioural change with regard to body posture , workplace adjustment , breaks and coping with high work dem and s ( WS and WSPA group ) and physical activity ( WSPA group ) . Pain , disability at work , days with symptoms and months without symptoms were measured at baseline and after 6 ( T1 ) and 12 months ( T2 ) . Self‐reported recovery was assessed at T1/T2 . Both interventions were ineffective in improving recovery . The work style intervention but not the combined intervention was effective in reducing all pain measures . These effects were present in the neck/shoulder , not in the arm/wrist/h and . For the neck/shoulder , the work style intervention group also showed an increased recovery‐rate . Total physical activity increased in all study groups but no differences between groups were observed . To conclude , a group‐based work style intervention focused on behavioural change was effective in improving recovery from neck/shoulder symptoms and reducing pain on the long‐term . The combined intervention was ineffective in increasing total physical activity . Therefore we can not draw conclusions on the effect of increasing physical activity on the recovery from neck and upper limb symptoms Introduction This study aims to investigate the relationship between work-related physical and psychosocial characteristics and complaints of the neck , shoulder and forearm/h and s. Methods Data were used from a prospect i ve Dutch cohort study among computer office workers with a follow-up period of 2 years . The study was conducted among 264 computer users . Physical and psychosocial risk factors were tested to predict the occurrence of neck , shoulder and forearm/h and s complaints . Bivariate and multivariable logistic regression was used to identify the association between risk factors and outcome variables . Results The 2 year follow-up prevalence rates with 95 % CI for neck complaints were 0.31 ( 0.28–0.37 ) , for shoulder complaints 0.33 ( 0.27–0.39 ) and for forearm/h and s complaints 0.21 ( 0.14–0.28 ) . Four main predictors for the occurrence of neck and shoulder complaints were identified : ( 1 ) Irregular head and body posture [ OR : 1.1 ( 1.0–1.2 ) P = 0.04 ] ; ( 2 ) task difficulty ( job dem and s ) [ OR : 1.2 ( 1.0–1.5 ) P = 0.01 ] ; ( 3 ) number of working hours/day with the computer [ OR : 1.20 ( 1.0–1.4 ) P = 0.03 ] ; and ( 4 ) having had a previous history of complaints [ OR : 7.2 ( 3.8–13.2 ) P = 0.01 ] . Two predictors were identified for forearm/h and s complaints : time pressure ( job dem and s ) [ OR : 1.20 ( 1.0–1.4 ) P = 0.03 ] and having had a previous history of complaints [ OR : 7.1 ( 3.5–14.1 ) P = 0.06 ] . Conclusion This longitudinal study suggests that risk factors of upper musculoskeletal complaints in computer workers consist of a mixture of physical and psychosocial characteristics OBJECTIVE The prevalence of neck muscle pain has steadily increased and especially pain from the descending part of the trapezius muscle has been associated with monotonous work tasks such as computer work . Physical exercise is generally recommended as treatment , but it is unclear which type of training is most effective . Our objective was to determine the effectiveness of specific strength training of the painful muscle versus general fitness training without direct involvement of the painful muscle ( leg bicycling ) on work-related neck muscle pain . METHODS We conducted a r and omized controlled trial and recruited subjects from 7 workplaces characterized by monotonous jobs ( e.g. , computer-intensive work ) . Forty-eight employed women with chronic neck muscle pain ( defined as a clinical diagnosis of trapezius myalgia ) were r and omly assigned to 10 weeks of specific strength training locally for the affected muscle , general fitness training performed as leg bicycling with relaxed shoulders , or a reference intervention without physical activity . The main outcome measure was an acute and prolonged change in intensity of neck muscle pain ( 100-mm visual analog scale [ VAS ] ) . RESULTS A decrease of 35 mm ( approximately 79 % ; P<0.001 ) in the worst VAS pain score over a 10-week period was seen with specific strength training , whereas an acute and transient decrease in pain ( 5 mm ; P<0.05 ) was found with general fitness training . CONCLUSION Specific strength training had high clinical relevance and led to marked prolonged relief in neck muscle pain .  General fitness training showed only a small yet statistically significant acute pain reduction Introduction It has been suggested that treatments may be more effective when they are matched to patient characteristics . This study aim ed at investigating potential prognostic factors for clinical ly relevant improvement in symptom intensity and symptom-related disability among employees with symptoms in the neck/shoulder area , receiving either ergonomics counseling or such counseling in combination with myofeedback training .  Methods A r and omized controlled study was performed among female computer users aged 45 or older ( n = 36 ) . A clinical examination and a question naire survey were performed before inclusion in the study . Symptom intensity and disability was assessed using question naires before the start of the interventions ( baseline ) and at follow-ups directly after the end of the interventions ( T0 ) and after 3 ( T3 ) and 6 ( T6 ) months . Logistic regression analyses were performed in order to assess prognostic factors for clinical ly relevant improvement in symptom intensity and disability . Results Improvement in symptom intensity was consistently predicted by symptom intensity at baseline . Diagnosis and stress-induced lack of muscular rest were prognostic factors for improvement in symptom intensity at short term follow-up . Baseline disability and passive coping consistently served as prognostic factors for outcome in disability . Few substantial differences were found between the interventions in terms of prognostic factors . Conclusions Myofeedback training in combination with ergonomics counseling seem to be an especially beneficial tool for secondary prevention among employees with moderate levels of symptom intensity and symptom-related disability , who respond to work-related stress by increased/sustained muscle activation , and who tend to employ passive coping to deal with their neck/shoulder symptoms
In subgroup analyses , we found an equal effect of different stressor types ( i.e. cognitive/emotional stress , work pace , and precision ) on muscle activity in both body regions .
In conclusion , simulated workplace stressors result in an increase in neck-shoulder and forearm muscle activity .
No indications were found that different types of stressors affect these body regions differently .
Workplace stressors have been indicated to play a role in the development of neck and upper extremity pain possibly through an increase of sustained ( low-level ) muscle activity .
The aim of this review was to study the effects of workplace stressors on muscle activity in the neck-shoulder and forearm muscles .
An additional aim was to find out whether the muscles of the neck-shoulder and the forearm are affected differently by different types of workplace stressors .