Collaborating with radiographers to address their work-related musculoskeletal discomfort.

The prevalence of musculoskeletal (MSK) symptoms in radiographers is high, similar to other healthcare occupations that involve high levels of physical exertion (e.g. patient handling; grasping and moving equipment). Reports of interventions to reduce MSK discomfort in radiographers are limited. A participatory approach was used to investigate daily challenges, needs, and opportunities for developing interventions to address exposures to many of the risk factors that contribute to MSK symptoms in radiographers. In this paper, we present the expressed needs of experienced radiographers (including assistance with patient handling, security, supportive design of equipment and work spaces), along with their evaluations of several intervention concepts intended to address some of those needs. We also report results from tests of three prototype interventions stemming from this participatory process that demonstrate the potential for new engineering control concepts to reduce the physical effort associated with some of the most common tasks radiographers perform.

Collaborating with mammographers to address their work-related musculoskeletal discomfort.

Mammographers are an understudied group of health care workers, yet the prevalence of musculoskeletal (MSK) symptoms in mammographers appears to be elevated, similar to many occupations in health care. In this study, we used a participatory approach to identify needs and opportunities for developing interventions to reduce mammographers' exposures to risk factors that lead to the development of MSK symptoms. In this paper, we present a number of those needs and several intervention concepts along with evaluations of those concepts from experienced mammographers. We include findings from a preliminary field test of a novel intervention concept to reduce the need to adopt awkward postures while positioning patients for a screening or diagnostic mammogram. Practitioner Summary: This paper discusses needs, opportunities and methods for working with mammographers in order to develop interventions to reduce their exposure to risk factors for work-related musculoskeletal discomfort. Results from a field test of a novel intervention to reduce mammographers' awkward work postures while positioning patients are presented.

Collaborating with cardiac sonographers to develop work-related musculoskeletal disorder interventions.

For more than two decades, surveys of imaging technologists, including cardiac sonographers, diagnostic medical sonographers and vascular technologists, have consistently reported high prevalence of work-related musculoskeletal discomfort (WRMSD). Yet, intervention research involving sonographers is limited. In this study, we used a participatory approach to identifying needs and opportunities for developing interventions to reduce sonographers' exposures to WRMSD risk factors. In this paper, we present some of those needs. We include descriptions of two interventions, targeted for cardiac sonographers, that were developed, through an iterative process, into functional prototypes that were evaluated in pilot tests by practicing sonographers. One of these interventions is now in daily use. We would like other engineers and ergonomists to recognise this area of opportunity to apply their knowledge of biomechanics and design in order to begin to address the high prevalence of WRMSDs in sonographers, by working with sonographers to develop useful and usable interventions. Practitioner Summary: This paper discusses needs, opportunities and methods for working with sonographers in order to develop interventions to reduce their exposure to risk factors for work-related musculoskeletal discomfort. Results from field tests of two novel interventions targeting cardiac sonographers are also presented.

Adjustable task lighting: Field study assesses the benefits in an office environment.

BACKGROUND: Lighting is a part of every work task in the office environment, yet it is often overlooked. Research links direct and indirect glare to increased risk of visual discomfort among office workers with symptoms ranging from dry eyes to blurry vision or headaches. Researchers have been primarily concerned with those characteristics of task lighting that cause glare including luminance level, position (line of sight), and control. It is unknown what the benefits of adjustable task lights are and whether or not their use has an effect on musculoskeletal comfort or posture. No comprehensive field evaluations of this type were found among peer-reviewed, indexed journals. OBJECTIVE: The purpose of this study was to assess the ergonomic and calculated utility power consumption benefits of adjustable LED task lighting in an office environment using a control/intervention experiment design. METHODS: One hundred participants were originally recruited and randomly assigned to intervention and control groups. Self-reported data was collected on level of eye fatigue, perception of job content, intervention usability, and musculoskeletal discomfort. Data was also collected on workspace level of illumination and posture during standardized tasks (assessed using RULA). RESULTS: Comparing baseline data to follow-up data for the intervention group, the use of the adjustable, LED task lights provided statistically significant, positive impacts on users' rating of discomfort, eye fatigue, perception of job content, and posture between baseline and the short-term follow up. CONCLUSIONS: Significant benefits to musculoskeletal comfort, posture, and visual comfort were documented when participants used the adjustable task lights. Participants' assessments of the light's usability, usefulness and desirability were positive. There were no negative results found with adjustable task light use.

Enhancing quality of life through Universal Design.

OBJECTIVES: To inform clinicians, caregivers and researchers involved with assessing and treating individuals with neurological disabilities of the benefits of universal design in enhancing quality of life. The improvement of quality of life has the potential to benefit the individuals with neurological disabilities and those whose lives overlap and intersect with those individuals. METHODS: Literature and design reviews are used as a foundation for a model for incorporating and leveraging universal design to the benefit of the patient's social sphere, which includes caregivers, family members and medical staff. By matching patients varied abilities with universal design solutions, the model of universal design benefitting the patients' social sphere will be demonstrated. RECOMMENDATIONS: Recommendations are made for clinicians and researchers that they may use in their practices and investigations in three areas: 1) educating patients about the benefits of universal design, 2) helping inform patients how to leverage universally designed products and approaches in their lives and living spaces and 3) understanding how to incorporate universal design principles into research and clinical spaces as demonstration pieces for patients.

Enhancing quality of life through Universal Design.

OBJECTIVES: To inform clinicians, caregivers and researchers involved with assessing and treating individuals with neurological disabilities of the benefits of universal design in enhancing quality of life. The improvement of quality of life has the potential to benefit the individuals with neurological disabilities and those whose lives overlap and intersect with those individuals. METHODS: Literature and design reviews are used as a foundation for a model for incorporating and leveraging universal design to the benefit of the patient's social sphere, which includes caregivers, family members and medical staff. By matching patients varied abilities with universal design solutions, the model of universal design benefitting the patients' social sphere will be demonstrated. RECOMMENDATIONS: Recommendations are made for clinicians and researchers that they may use in their practices and investigations in three areas: 1) educating patients to the benefits of universal design, 2) helping inform patients how to leverage universally designed products and approaches in their lives and living spaces and 3) understanding how to incorporate universal design principles into research and clinical spaces as demonstration pieces for patients.

Analysis of alternative keyboards using learning curves.

OBJECTIVE: To quantify learning percentages for alternative keyboards (chord, contoured split, Dvorak, and split fixed angle) and understand how physical, cognitive, and perceptual demand affect learning. BACKGROUND: Alternative keyboards have been shown to offer ergonomic benefits over the conventional, single-plane QWERTY keyboard design, but productivity-related challenges may hinder their widespread acceptance. METHOD: Sixteen participants repeatedly typed a standard text passage using each alternative keyboard. Completion times were collected and subsequent learning percentages were calculated. Participants were asked to subjectively rate the physical, cognitive, and perceptual demands of each keyboard, and these values were then related to the calculated learning percentages. RESULTS: Learning percentage calculations revealed the percentage for the split fixed-angle keyboard (90.4%) to be significantly different (p < .05) from the learning percentages for the other three keyboards (chord, 77.3%; contour split, 76.9%; Dvorak, 79.1%). The average task completion time for the conventional QWERTY keyboard was 40 s, and the average times for the fifth trial on the chord, contoured split, Dvorak, and split fixed-angle keyboards were 346, 69, 181, and 42 s, respectively. CONCLUSIONS: Productivity decrements can be quickly regained for the split fixed-angle and contour split keyboard but will take considerably longer for Dvorak and chord keyboards. The split fixed-angle keyboard involved physical learning, whereas the others involved some combination of physical and cognitive learning, a result supported by the subjective responses. APPLICATION: Understanding the changes in task performance time that come with learning can provide additional information for a cost-benefit analysis when considering the implementation of ergonomic interventions.

Low-level exertions of the neck musculature: a study of research methods.

Musculoskeletal neck discomfort is prevalent in many occupations and has been the focus of much research employing surface electromyography (sEMG). Significant differences in experimental methods among researchers make comparisons across studies difficult. The goal of the current research was to use empirical methods to answer specific methodological questions concerning use of sEMG in evaluation of the neck extensor system. This was accomplished in two studies. In Experiment 1, ultrasound technology was used to: (a) determine accessibility of m. splenius and semispinalis capitis with surface electrodes, (b) identify appropriate electrode locations for these muscles/muscle groups, and (c) illustrate potential benefits of using ultrasound in locating muscles/placing electrodes. Experiment 2 sought to assess effects of posture when normalizing sEMG data. Results from Experiment 1 showed no direct access to semispinalis capitis for surface electrodes; their activity can only be sampled as part of a group of muscles. In most subjects, m. splenius was found to be accessible to surface electrodes. Electrode placement recommendations are provided. Results of Experiment 2 showed significant differences in normalized EMG data between a posture-specific technique and a reference posture technique. Posture-specific normalization is recommended for accurately assessing the relative intensity of contractions of these muscles.