Physical workload during use of speech recognition and traditional computer input devices

Juul-Kristensen, Birgit; Laursen, Bjarne; Pilegaard, Marianne; Jensen, Bente Rona

doi:10.1080/00140130310001617912

Cited by 27 publications

(11 citation statements)

References 16 publications

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“…One of the main diagnoses related to forearm pain, lateral epicondylitis, has been found to include degenerative signs of the tendons around the lateral epicondyle (especially the tendon of the radial extensor muscle of the wrist) (41). As often found during the use of traditional computer input devices (text-entering and text-editing work), characterized as low force pronation and wrist extension, the radial extensor muscle of the wrist has high muscle activity (42). The fact that a great necessity to work fast decreased the risk of symptoms in the elbow could not be explained.…”

Section: Discussionmentioning

confidence: 99%

Computer users’ risk factors for developing shoulder, elbow and back symptoms

Juul-Kristensen¹,

Søgaard²,

Strøyer³

et al. 2004

Scand J Work Environ Health

182

134

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Section: Discussionmentioning

confidence: 99%

Computer users’ risk factors for developing shoulder, elbow and back symptoms

Juul-Kristensen¹,

Søgaard²,

Strøyer³

et al. 2004

Scand J Work Environ Health

182

134

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“…Text typing (1a) of a standard text, followed by editing (1b) of the previously typed text according to a standard procedure (Juul-Kristensen et al, 2004). Each tasks lasted until completion or 5 min.…”

Section: Protocolmentioning

confidence: 99%

Trapezius muscle rest time during standardised computer work – A comparison of female computer users with and without self-reported neck/shoulder complaints

Thorn

Søgaard

Kallenberg

et al. 2007

Journal of Electromyography and Kinesiology

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Work related musculoskeletal disorders (WMSDs) in the shoulder/neck area are a common and increasing problem among European computer workers, especially women. Long-term low-level workloads with low degree of muscle rest are a potential risk factor for developing WMSDs. The purpose of the present study of female computer users (age 45-65 years) in Denmark and Sweden was to investigate if subjects with self-reported neck/shoulder complaints (cases, N = 35) show less trapezius muscle relative rest time (RRT) than controls (N = 44) when performing standardised short-term computer work tasks in controlled laboratory conditions. Surface electromyography (EMG) signals were recorded bilaterally from the upper trapezius muscles during a type, edit, precision and colour word stress task. Besides RRT, 10th percentile RMS values were calculated. On the average, 15 of the cases and 18 of the controls showed analysable EMG files per task. For the colour word stress task, the results showed lower RRT values and higher 10th percentile RMS amplitude levels among cases compared to controls. No such signs could be found for the other tasks performed. The present results indicate an increased motor response to a psychological stressor among subjects with self-reported neck/shoulder complaints.

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“…In a recent study of computer workers, half of the subjects reported they had space enough to rest their arms, but only half of them seemed to have their arms supported during work, as observed from video recordings. 27 However, arm supports are not preferred in all computer tasks, for example, touch typing or repetitive work as data entry work, 28 as they may interfere with rapid, accurate movements, may limit operator freedom of movement, and cause chairs to be placed away from the work surface. Thus, arm supports are not always regarded as a recommended ergonomic condition, and even in situations where they are, it may be questioned whether they are fully used or not.…”

Section: General Strengths and Weaknesses Of The Studymentioning

confidence: 99%

Self-reported workplace related ergonomic conditions as prognostic factors for musculoskeletal symptoms: the “BIT” follow up study on office workers

Juul-Kristensen¹,

Jensen²

2005

Occup Environ Med

110

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Aims: To identify prognostic ergonomic and work technique factors for musculoskeletal symptoms among office workers and in a subgroup with highly monotonous repetitive computer work. Methods: A baseline questionnaire was delivered to 5033 office workers in 11 Danish companies in the first months of 1999, and a follow up questionnaire was mailed in the last months of 2000 to 3361 respondents. A subgroup with highly monotonous repetitive computer work was formed including those that were repeating the same movements and/or tasks for at least 75% of the work time. The questionnaire contained questions on ergonomic factors and factors related to work technique. The outcome variables were based on the frequency of musculoskeletal symptoms during the last 12 months. Logistic regression analyses were used to identify prognostic factors for symptoms in the three body regions. Results: In total, 39%, 47%, and 51% of the symptomatic subjects had a reduced frequency of symptom days in the neck/shoulder, low back, or elbow/hand region, respectively. In all regions more men than women had reduced symptoms. In the multivariate logistic regression analyses, working no more than 75% of the work time with the computer was a prognostic factor for musculoskeletal symptoms in the neck/ shoulder and elbow/hand, and a high influence on the speed of work was a prognostic factor for symptoms in the low back. In the subgroup with highly monotonous repetitive computer work, the odds ratios of the prognostic factors were similar to those for the whole group of office workers. Conclusion: When organising computer work it is important to allow for physical variation with other work tasks, thereby avoiding working with the computer during all the work time, and further to consider the worker's own influence on the speed of work. M usculoskeletal symptoms are common among office workers, and at the same time the duration of computer work in a modern occupational setting has increased dramatically. Consequently, studies of computer work have, to a large extent, focused on risk factors for development of musculoskeletal symptoms, including daily duration of computer work, repetitive movements, static and non-neutral wrist, arm, and neck work postures, lack of variation, and psychosocial factors. [1][2][3][4][5][6][7] In a review (mostly including cross-sectional studies) it was found that poor workstation ergonomics were involved in musculoskeletal problems.8 Ergonomic exposure at computer workplaces has been described as the elements of the workstation design, including the corresponding work postures and work technique. 9-14Although it has been generally accepted that the risk of developing symptoms is due to a posture involving static muscle work, very few prospective studies have supported poor ergonomics as a risk factor. One study found that only a few of the ergonomic factors were linked to work postures. 9 Two prospective studies showed poor ergonomics (screen height above eye level, glare/reflection, postural and workstation factors) a...

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Physical workload during use of speech recognition and traditional computer input devices

Cited by 27 publications

References 16 publications

Computer users’ risk factors for developing shoulder, elbow and back symptoms

Computer users’ risk factors for developing shoulder, elbow and back symptoms

Trapezius muscle rest time during standardised computer work – A comparison of female computer users with and without self-reported neck/shoulder complaints

Self-reported workplace related ergonomic conditions as prognostic factors for musculoskeletal symptoms: the “BIT” follow up study on office workers

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