Venerina Johnston

Neck movement and muscle activity characteristics in female office workers with neck pain.

Study Design. Cross-sectional study. Objective. To explore aspects of cervical musculoskeletal function in female office workers with neck pain. Summary of Background Data. Evidence of physical characteristics that differentiate computer workers with and without neck pain is sparse. Patients with chronic neck pain demonstrate reduced motion and altered patterns of muscle control in the cervical flexor and upper trapezius (UT) muscles during specific tasks. Understanding cervical musculoskeletal function in office workers will better direct intervention and prevention strategies. Methods. Measures included neck range of motion; superficial neck flexor muscle activity during a clinical test, the craniocerivcal flexion test; and a motor task, a unilateral muscle coordination task, to assess the activity of both the anterior and posterior neck muscles. Office workers with and without neck pain were formed into 3 groups based on their scores on the Neck Disability Index. Nonworking women without neck pain formed the control group. Surface electromyographic activity was recorded bilaterally from the sternocleidomastoid, anterior scalene (AS), cervical extensor (CE) and UT muscles. Results. Workers with neck pain had reduced rotation range and increased activity of the superficial cervical flexors during the craniocervical flexion test. During the coordination task, workers with pain demonstrated greater activity in the CE muscles bilaterally. On completion of the task, the UT and dominant CE and AS muscles demonstrated an inability to relax in workers with pain. In general, there was a linear relationship between the workers’ self-reported levels of pain and disability and the movement and muscle changes. Conclusion. These results are consistent with those found in other cervical musculoskeletal disorders and may represent an altered muscle recruitment strategy to stabilize the head and neck. An exercise program including motor reeducation may assist in the management of neck pain in office workers.

The effect of a scapular postural correction strategy on trapezius activity in patients with neck pain

Extensive computer use amongst office workers has lead to an increase in work-related neck pain. Aberrant activity within the three portions of the trapezius muscle and associated changes in scapular posture have been identified as potential contributing factors. This study compared the activity (surface electromyography) of the three portions of the trapezius in healthy controls (n = 20) to a neck pain group with poor scapular posture (n = 18) during the performance of a functional typing task. A scapular postural correction strategy was used to correct scapular orientation in the neck pain group and electromyographic recordings were repeated. During the typing task, the neck pain group generated greater activity in the middle trapezius (MT) (p = 0.02) and less activity in the lower trapezius (LT) (p = 0.03) than the control group. Following correction of the scapula, activity recorded by the neck pain group was similar to the control group for the middle and lower portions (p = 0.09; p = 0.91). These findings indicate that a scapular postural correction exercise may be effective in altering the distribution of activity in the trapezius to better reflect that displayed by healthy individuals.

Work-related upper quadrant musculoskeletal disorders in midwives, nurses and physicians: A systematic review of risk factors and functional consequences

BACKGROUND Given a worldwide shortage of primary health care workers predicted to worsen, it is vital to address sources of attrition among these professionals. One such source may be work-related musculoskeletal disorders. We aimed to identify risk factors for and functional consequences of work-related upper quadrant musculoskeletal disorders in midwives, nurses and physicians. METHODS Eighteen of 87 studies identified from an electronic database search met the inclusion and quality criteria. RESULTS Job demands, demanding work schedules and physical exposures have the strongest associations with work-related upper quadrant musculoskeletal disorders. Functional consequences included widespread use of prescription and over-the-counter medications and major negative impact on activities of daily living. No studies of midwives were located. CONCLUSION High-quality studies of midwives as well as better-designed prospective studies of nurses and physicians are needed. Results of such studies could inform preventive strategies and reduce the contribution of work-related musculoskeletal disorders to attrition.

Altered Trapezius Muscle Behavior in Individuals With Neck Pain and Clinical Signs of Scapular Dysfunction

OBJECTIVE The purpose of this study was to compare the behavior of the trapezius muscle in patients with chronic mechanical neck pain (MNP) and clinical signs of scapula dysfunction to healthy controls. METHODS This is a cross-sectional, between-participant study of trapezius muscle behavior. Eighteen volunteers with chronic MNP and 20 healthy controls participated in the study. Participants performed isometric shoulder abduction, external rotation, and flexion at 3 intensities of effort (maximum voluntary contraction [MVC], 50% MVC, and 20% MVC). Electromyographic signals were recorded unilaterally from the upper, middle, and lower portions of the trapezius muscle during isometric shoulder contractions. RESULTS Significantly greater levels of lower trapezius electromyographic signals were observed in patients with MNP compared with controls for the abduction (P < .027) and external rotation (P < .036) conditions but not for the flexion condition (P > .392). No differences in activity were observed in the upper (P > .248) or middle (P > .052) portions of trapezius between groups during any of the isometric shoulder girdle conditions. CONCLUSIONS These findings represent a change in the behavior of the lower trapezius muscle in individuals with MNP who exhibit clinical signs of scapular dysfunction. Clinicians should consider the potential involvement of the axioscapular muscles when assessing patients with chronic neck pain, as retraining scapular function may be required for the successful management of these patients.

Interaction of psychosocial risk factors explain increased neck problems among female office workers

Abstract This study investigated the relationship between psychosocial risk factors and (1) neck symptoms and (2) neck pain and disability as measured by the neck disability index (NDI). Female office workers employed in local private and public organizations were invited to participate, with 333 completing a questionnaire. Data were collected on various risk factors including age, negative affectivity, history of previous neck trauma, physical work environment, and task demands. Sixty‐one percent of the sample reported neck symptoms lasting greater than 8 days in the last 12 months. The mean NDI of the sample was 15.5 out of 100, indicating mild neck pain and disability. In a hierarchical multivariate logistic regression, low supervisor support was the only psychosocial risk factor identified with the presence of neck symptoms. Similarly, low supervisor support was the only factor associated with the score on the NDI. These associations remained after adjustment for potential confounders of age, negative affectivity, and physical risk factors. The interaction of job demands, decision authority, and supervisor support was significantly associated with the NDI in the final model and this association increased when those with previous trauma were excluded. Interestingly, and somewhat contrary to initial expectations, as job demands increased, high decision authority had an increasing effect on the NDI when supervisor support was low.

The prevalence of work-related neck, shoulder, and upper back musculoskeletal disorders among midwives, nurses, and physicians: a systematic review.

With the global shortage of health care workers predicted to worsen, attrition from the work force must be minimized. This review examined the incidence or prevalence of neck, shoulder, and upper back musculoskeletal disorders, a possible source of attrition, among midwives, nurses, and physicians. Four electronic databases were systematically searched for publications meeting inclusion criteria. Reference lists of retrieved articles were hand searched for additional articles. After eliminating articles that did not meet inclusion criteria, the remaining articles were assessed for quality and prevalence or incidence data were extracted. Twenty-nine articles published between 1990 and 2012 were included and assessed for quality. Median annual prevalence rates were 45% (neck), 40% (shoulder), and 35% (upper back). Methodological concerns included small sample size, inconsistency of outcome measures, likelihood of non-response bias, and low response rates. Midwives, who have not been well studied, demonstrated prevalence somewhat lower than that of nurses and physicians.

Contribution of individual, workplace, psychosocial and physiological factors to neck pain in female office workers

This study investigated the relative contribution of individual, workplace, psychosocial and physiological features associated with neck pain in female office workers towards developing appropriate intervention programs. Workers without disability (Neck Disability Index (NDI) score≤8, n=33); workers with neck pain and disability (NDI≥9/100, n=52) and 22 controls (women who did not work and without neck pain) participated in this study. Two logistic regression models were constructed to test the association between various measures in (1) workers with and without disability, and (2) workers without disability and controls. Measures included those found to be significantly associated with higher NDI in our previous studies: psychosocial domains; individual factors; task demands; quantitative sensory measures and measures of motor function. In the final model, higher score on negative affectivity scale (OR=4.47), greater activity in the neck flexors during cranio‐cervical flexion (OR=1.44), cold hyperalgesia (OR=1.27) and longer duration of symptoms (OR=1.19) remained significantly associated with neck pain in workers. Workers without disability and controls could only be differentiated by greater muscle activity in the cervical flexors and extensors during a typing task. No psychosocial domains remained in either regression model. These results suggest that impairments in the sensory and motor system should be considered in any assessment of the office worker with neck pain and may have stronger influences on the presenting symptoms than workplace and psychosocial features.

Interactive effects from self-reported physical and psychosocial factors in the workplace on neck pain and disability in female office workers

This study explored the interaction between physical and psychosocial factors in the workplace on neck pain and disability in female computer users. A self-report survey was used to collect data on physical risk factors (monitor location, duration of time spent using the keyboard and mouse) and psychosocial domains (as assessed by the Job Content Questionnaire). The neck disability index was the outcome measure. Interactions among the physical and psychosocial factors were examined in analysis of covariance. High supervisor support, decision authority and skill discretion protect against the negative impact of (1) time spent on computer-based tasks, (2) non-optimal placement of the computer monitor and (3) long duration of mouse use. Office workers with greater neck pain experience a combination of high physical and low psychosocial stressors at work. Prevention and intervention strategies that target both sets of risk factors are likely to be more successful than single intervention programmes. Statement of Relevance: The results of this study demonstrate that the interaction of physical and psychosocial factors in the workplace has a stronger association with neck pain and disability than the presence of either factor alone. This finding has important implications for strategies aimed at the prevention of musculoskeletal problems in office workers.

Soldier occupational load carriage: a narrative review of associated injuries

This narrative review examines injuries sustained by soldiers undertaking occupational load carriage tasks. Military soldiers are required to carry increasingly heavier occupational loads. These loads have been found to increase the physiological cost to the soldier and alter their gait mechanics. Aggregated research findings suggest that the lower limbs are the most frequent anatomical site of injury associated with load carriage. While foot blisters are common, other prevalent lower limb injuries include stress fractures, knee and foot pain, and neuropathies, like digitalgia and meralgia. Shoulder neuropathies (brachial plexus palsy) and lower back injuries are not uncommon. Soldier occupational load carriage has the potential to cause injuries that impact on force generation and force sustainment. Through understanding the nature of these injuries targeted interventions, like improved physical conditioning and support to specialised organisations, can be employed.

The impact of onsite workplace health-enhancing physical activity interventions on worker productivity: a systematic review

The aim of this study is to investigate the effects of onsite workplace health-enhancing physical activity (HEPA) programmes on worker productivity. The PROSPERO registration number is CRD42014008750. A search for controlled trials or randomised controlled trials (RCTs) that investigated the effects of onsite workplace HEPA programmes on productivity levels of working adults was performed. Risk of bias of included studies was assessed, and the inter-rater reliability of the quality assessment was analysed. Qualitative synthesis of available evidence is presented. Eight studies were included in the review. There is consistent evidence that onsite workplace HEPA programmes do not reduce levels of sick leave. There appears to be inconsistent evidence of the impact of onsite workplace HEPA programmes on worker productivity. A high-quality study of an onsite combination (aerobic, strengthening and flexibility) HEPA regime and a moderate-quality study of a Tai Chi programme improved worker productivity measured with questionnaires in female laundry workers and older female nurses, respectively. Two high-quality studies and four moderate-quality studies did not show benefit. Studies that showed benefit were mainly those designed with productivity measures as primary outcomes, delivered to occupations involved with higher physical loads, and had higher compliance and programme intensity. The small number of studies and the lack of consistency among studies limited further analyses. There is inconsistent evidence that onsite workplace HEPA programmes improve self-reported worker productivity. Future high-quality RCTs of onsite workplace HEPA programmes should be designed around productivity outcomes, target at-risk groups and investigate interventions of sufficient intensity. High attendance with improved recording is needed to achieve significant results in augmenting worker productivity.