The effect of imposed and self-selected computer monitor height on posture and gaze angle

Burgess-Limerick, Robin; Plooy, Annaliese M.; Ankrum, Dennis R.

doi:10.1016/s0268-0033(98)00021-7

Cited by 91 publications

(53 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The maximal neck extension angle was lower in the N-WC than in the S-WC and the cervical ROM was larger, likely because the cervical moment arm was lower. Previous studies have reported that cervical ROM decreases as FHP increases [20,28], and that cervical ROM is lower in FHP than in a neutral posture [9,14,20]. CES activity was higher in the N-WC than in the S-WC.…”

Section: Discussionmentioning

confidence: 65%

The effect of a newly developed wheelchair with thoracic and pelvic support on cervical movement and muscle activity in healthy elderly women

Sawada

Hatta

Kishigami

et al. 2015

European Geriatric Medicine

View full text Add to dashboard Cite

Background: As the population ages, the number of elderly individuals using a wheelchair is increasing. A standard wheelchair with a vertical backrest (S-WC) pushes on a kyphotic spine and exacerbates forward head posture. Forward head posture limits cervical movement. We used a new wheelchair (N-WC) that does not exacerbate thoracic kyphosis. The N-WC does not have a flat backrest, but has a support belt for the thorax and pelvis. The purpose of this study was to compare head-neck angle, cervical range of motion, and cervical muscle activity in the N-WC and the S-WC in healthy elderly women. Methods: We measured head-neck alignment, trunk tilt angle, cervical muscle activity, and pressure distribution on the backrest. Data from 17 subjects were analyzed. Results: Head-neck angle was close to neutral in the N-WC. The trunk was tilted further back and the area over which pressure was distributed on the backrest was expanded in the N-WC. Cervical range of motion and cervical muscle activity during neck extension were significantly greater in the N-WC than in the S-WC, but during neck flexion, there was no significant difference between the wheelchairs. Conclusion: In the N-WC, head-neck alignment was close to the neutral posture because the wheelchair support belt accommodated kyphosis and did not push the spine forward, so cervical muscle activity may be reduced when at rest. These results suggest that the N-WC prevented forward head posture and improved cervical movement and muscle activity. (C) 2014 Elsevier Masson SAS and European Union Geriatric Medicine Society. All rights reserved

show abstract

Section: Discussionmentioning

confidence: 65%

The effect of a newly developed wheelchair with thoracic and pelvic support on cervical movement and muscle activity in healthy elderly women

Sawada

Hatta

Kishigami

et al. 2015

European Geriatric Medicine

View full text Add to dashboard Cite

show abstract

“…Moreover, the maintenance of a head-forward posture decreases cervical lordosis of the lower cervical vertebrae and creates a posterior curve in the upper thoracic vertebrae to maintain balance; this is known as the forward head posture (FHP; turtle neck posture) [2][3][4]. A previous study stated that FHP causes shortening of the muscular fibers around the articulation points of the atlantooccipitalis and overstretching of muscles around joints, possibly producing chronic neck pain [5]. According to a recent study, the weight supported by the spine dramatically increases when flexing the head forward at varying degrees.…”

Section: Introductionmentioning

confidence: 99%

The effects of heavy smartphone use on the cervical angle, pain threshold of neck muscles and depression

Park¹,

Kim²,

Kim³

et al. 2015

Advanced Science and Technology Letters

View full text Add to dashboard Cite

Abstract.A forward head posture (turtle neck posture) is becoming more common with the increasing popularity of smartphones. The aim of this study was to evaluate the craniovertebral angle, head position angle, pain threshold of the sternocleidomastoid and upper trapezius muscles, and presence of depression in heavy smartphone users compared to a control group. Twenty healthy students participated in the study. The participants were recruited from Sahmyook University and were divided into a heavy user group (n=10) and a control group (n=10) according to smartphone addiction proneness. Participants in both groups were assessed for their pain pressure threshold of the sternocleidomastoid and upper trapezius muscles, craniovertebral angle and head position angle, and depression. When comparing the results between the two groups, there were significant differences in the pain threshold of the sternocleidomastoid and upper trapezius muscles, head position angle, and depression (p<.05), but not in the craniovertebral angle. Based on the results, this study shows that heavy smartphone use may produce considerable stresses on the cervical spine, thus changing the cervical curve and pain threshold of the muscles around the neck. Smartphones could also cause negative effects on a person's psychological status, such as depression. Therefore, individuals should make an effort to look at their phones with a neutral spine and to avoid spending hours hunched over their screens each day.

show abstract

“…The normal resting point of the eyes in regards to gaze is approximately 15 degrees below the horizontal line of sight, therefore to reduce visual strain, it is recommended that the computer screen is placed below this level (Seghers et al, 2003). In general, higher screen placement appears to be correlated with visual strain (Burgess-Limerick et al 1998;Villanueva et al, 1996).…”

Section: Positional Factors That Moderate the Riskmentioning

confidence: 99%

Postural Risks Associated with Laptop Use on a Bed

Bubric

2014

Proceedings of the Human Factors and Ergonomics Society Annual

View full text Add to dashboard Cite

This study consists of a survey and experiment to identify the postural risks associated with laptop use in non-traditional work settings. The survey gauged the prevalence of musculoskeletal discomfort among 186 college students, and also identified the configurations in which male and female students most frequently use laptop computers. Previous work suggests that females report a higher prevalence of musculoskeletal discomfort associated with laptop use than males, and the results of the survey confirmed this, but only for neck and shoulder discomfort. Differences in how males and females reported working were also revealed, with females more likely to use a laptop positioned on the lap and also while sitting with their legs crossed. Males, on the other hand, were more likely to report using a laptop while sitting in positions that required large trunk deviations, such as bending over a coffee table or to the side.The experiment, which was based on the survey findings, explored the reasons why females reported experiencing more frequent neck and shoulder discomfort when using a laptop than did males. It was hypothesized that this was because females use laptop computers more frequently in deviated postures. Three configurations that females reported working in more frequently than males in the survey were selected for testing, each within the context of a bed/mattress. Postural analysis and discomfort data was collected for 36 participants (18 males, 18 females) performing a 25-minute typing task in each of the three conditions to determine whether these configurations placed the participants in highly deviated postures. Gender comparisons of postural deviation and self-reported discomfort ratings after completion of a typing task in each position were made.Both male and female participants reported very low levels of discomfort in each of the three conditions, and there was no significant gender difference. Participants displayed highly deviated postures, particularly in the neck, shoulders, and wrists, in all three conditions and there were few gender differences. Any gender differences that were discovered were not consistently in favor of one gender. Males had a slight tendency to work in more deviated postures than females, however both genders were in undesirable postures for much of the experiment.It is most likely that any increased prevalence of musculoskeletal discomfort in females compared to males is due to their choice of working configuration, rather than inherent differences in posture. However, there are a number of other factors that may account for any gender differences in musculoskeletal discomfort, including the finding that females report spending more hours per week using a computer. Further study to identify the contribution of each factor, both in males and females, would be valuable in order to understand the impact that working configuration has on musculoskeletal discomfort and injury i BIOGRAPHICAL SKETCH Katherine Bubric was born in Calgary, Alberta, where she received a ...

show abstract

The effect of imposed and self-selected computer monitor height on posture and gaze angle

Cited by 91 publications

References 13 publications

The effect of a newly developed wheelchair with thoracic and pelvic support on cervical movement and muscle activity in healthy elderly women

The effect of a newly developed wheelchair with thoracic and pelvic support on cervical movement and muscle activity in healthy elderly women

The effects of heavy smartphone use on the cervical angle, pain threshold of neck muscles and depression

Postural Risks Associated with Laptop Use on a Bed

Contact Info

Product

Resources

About