VDT Work Research Articles

Relationship between using tables, chairs, and computers and improper postures when doing VDT work in work from home.

This study focused on everyday furniture and computers used in work from home and aimed to investigate how improper postures increase the risk of musculoskeletal disorders using different combinations of tables, chairs, and computers. Twenty-one healthy participants were asked to perform a visual display terminal task for 30 minutes in a laboratory modeled on the work from home concept. Seven experimental conditions were set up according to the different combinations of desks, chairs, and computers. Three-dimensional body posture was measured using a magnetic tracking device. The results showed that when using a low table, floor chair, and laptop computer, the body posture above the hip was similar to that when using a dining table, chair, and desktop computer. When using a sofa, and tablet computers, or laptop computer, severe neck flexion, which is stressful to the neck, was observed. Moreover, excessive low back flexion was observed when using a floor cushion and laptop computer. We suggest that computer work while sitting on a sofa or floor cushion without a backrest is harmful to the neck and low back.

Verification of the Stress Reduction System Using Forest Video in VDT Work

Verification of the Stress Reduction System Using Forest Video in VDT Work

Recommended Hints for Improved Lifestyle and Health from Integrative Medicine (IM) In the Critical Situation of COVID-19

For the current critical situation of COVID-19 worldwide, several recommended hints for improved lifestyle and health were described from integrative medicine (IM) point of view. It includes some categories as follows. i) Exercise: Hippocrates said that walking is the best medicine. Walking fast, climbing stairs, and squats are effective. ii) Sleep and rhythmic lifestyle: Keep sleep and wake up time regularly, avoid looking at display or VDT work before sleep, and have bright light when waking up, especially sunlight. iii) Mental care: The US CDC presents the stressful influences, such as fear and worry about health, worsening of chronic health problems, and increased use of alcohol. Some recommendations of controlling heart and minds include keeping the natural feeling of being as it is, and mindfulness related to the oriental Zen concept. iv) Nutrition: IM and anti-inflammatory diet were proposed by Dr. Andrew Weil at Arizona University. The diet is based on two diets—the Mediterranean diet and the Okinawan diet. v) IM: Several applicable tips for IM show chiropractic, aromatherapy, supplements, medical herbs, Chinese medicine, Ayurveda, acupuncture, and others.

The Influence of the 4 weeks Intake of Water-soluble <i>Perilla frutescens</i> var. acuta Extract on Refractive Error and Visual Function

Purpose : The purpose of this study is to find how it influences on refractive error and visual function by intaking water soluble Perilla frutescens var. acuta (PFA) extract for 4 weeks. Method : After the permission of the institutional review board of medical devices (IRB Permission No.: DSGOH-042), This study was tested on 30 adult men and women. Two hours after PFA or placebo was taken in, smart device based VDT work had been done for 2 hours. And then, the results before and after PFA intake were compared with those in control group. Result : As a result, the PFA intake group tended to improve Spherical Equivalent Refractive Error statistically and significantly(p=0.001, p=0.000). Compared to the placebo intake group, the PFA intake group had statistically significant improvements in the near point of convergence and the near point of accommodation(p=0.007, p=0.001, p=0.001, p=0.000). According to the test on binocular accommodative facility, the PFA group showed a more significant rise after intake than before intake(p=0.021). The placebo group had no significant difference. Also, there was no significant difference between the two groups(p=0.876). After intake of PFA or placebo for 4 weeks, the safety before and after intake was evaluated. As a result, the two intake groups had no abnormal reaction. It was judged that taking in water-soluble PFA extract was safe to the human body. Conclusion : PFA increased activity of ciliary body muscles more than placebo. Therefore, it is considered to suppress a rise in refractive error and to improve convergence, accommodation, and asthenopia.

1C4-4 Effect of menstrual cycle on workload during nighttime VDT work.

1C4-4 Effect of menstrual cycle on workload during nighttime VDT work.

The influence of the balans chair on neck muscle activity during VDT work

The influence of the balans chair on neck muscle activity during VDT work

ある教員養成系大学とその附属学校の教職員のVDT 作業と 自覚症状に関する5 年間の縦断的解析

ある教員養成系大学とその附属学校の教職員のVDT 作業と 自覚症状に関する5 年間の縦断的解析

Visual fatigue following long-term visual display terminal work under different light sources

Although visual display terminals have been used in office work for many years, research on the effect of long time work using them is still insufficient. Also, the impact of a LED light source for all day work is not clear. In this paper, the visual fatigue caused by long-term VDT work under fluorescent and LED luminaires was investigated though subjective reports of symptoms, ophthalmological parameters and physiological signals. The results show that visual fatigue becomes more serious with increasing time spent at VDT work. Compared to fluorescent luminaires, the LED luminaires produced significantly greater near point accommodation, blink amplitude and oxygen saturation but less dry eye symptoms, less best corrected distance visual acuity and less high-frequency electrocardiogram power as time passed, although all were of small effect size. Although the participants carried out eight hours of VDT work under the two light sources, at the end the symptom ‘tired eyes’ was rated as moderate while all the other reported symptoms were rated as slight.

Effect of Tactile Feedback on Trunk Posture and EMG Activity in People With Postural Kyphosis During VDT Work

Background: Recently, there has been an emphasis on the use of interventions with biofeedback information for the maintenance or correction of posture. Objects: This study assessed the change of trunk posture and trunk muscle activation when people exhibiting postural kyphosis performed visual display terminal work with or without a contact feedback device (CFD). Methods: Eighteen right-handed individuals were recruited. Thoracic angle and right thoracic erector spinae (TES) muscle amplitude were analyzed. There were two sessions in these experiments. The control session involved 16 minutes of typing without a CFD, and the CFD session involved 16 minutes of typing with a CFD. The visual analog scale score was analyzed with a paired t-test, and the kinematic and electromyography data were analyzed through two-way repeated analysis of variance. Results: The paired t-tests revealed that subjects had significantly less pain after the CFD sessions than after the control sessions (p<.05). Significant main effects by session and by time were observed in the thoracic kyphosis angle (p<.05). There was a significant session×time interaction for TES amplitude (p<.05), along with significant main effects by session and by time (p<.05). Conclusion: The CFD caused people with postural kyphosis to straighten and to activate their TES continuously, even though they were habituated to bend their bodies forward. Therefore, the CFD was a beneficial treatment tool.

Comparison between White Housing and Black Housing Display on Eye Fatigue in VDT Work

Comparison between White Housing and Black Housing Display on Eye Fatigue in VDT Work

Effects of Blue Background in the Negative Display Mode on VDT Work Efficiency and Fatigue

Effects of Blue Background in the Negative Display Mode on VDT Work Efficiency and Fatigue

Eyeblink activity during VDT work using dual displays with a tablet computer

Eyeblink activity during VDT work using dual displays with a tablet computer

Effects of Blue Hue Background in the Positive Display Mode on VDT Work Efficiency and Fatigue

Effects of Blue Hue Background in the Positive Display Mode on VDT Work Efficiency and Fatigue

植物の設置による VDT作業時の疲労緩和効果に関する基礎的研究

近年，オフィスにおけるパソコン作業 (VDT作業) は増加しており，VDT作業による精神的な疲労が社会的問題となっている。そこで本研究では，作業机の上に植物を設置することによる VDT作業時の疲労緩和効果を主観的および客観的指標から検証した。その結果，植物の設置による生理的な変化は見られなかったが，作業における疲労に対する主観的評価が減少する傾向がみられた。これらの結果から，オフィスにおけるパソコン作業上のデスクに植物を設置することは心理的な側面から疲労緩和に有効であると考えられた。

Development of Ergonomic Balance Seat(e-BASE) Chair

Objective: The aim of this study is to develop an ergonomic office chair that has an alarm function for the unbalanced sitting postures. Background: Contrary to expectation, it is reported that office workers sit on their chairs much more in unbalanced postures during daily work. Even though an office worker uses an ergonomically good-designed chair and begins their work in a good sitting posture, his/her posture is likely to shift to the unbalanced bad posture. Therefore, a posture alarm system would be very helpful in keeping office workers' good postures. Method: We developed a prototype chair with four load cells under a seat pan and one load cell beneath a backrest. Through some experiments, we set the criteria for unbalanced bad postures then implemented the criteria into the alarm system of the prototype chair. The chair called e-BASE chair could detect unbalance postures and show alarms for chair users. We also enhanced back support by developing a step-wised folding backrest. Results: The e-BASE chair showed better performance in interface pressure distributions and balanced posture ratio in VDT work. Conclusion: The ergonomic chair with posture alarm function(e-BASE chair) was developed. It showed better performance in seat pressure distribution and in keeping good posture during office work. Application: The posture alarm system and folding backrest can be applied to the new models of office chair.

2C2-1 瞬目群発を考慮したVDT作業における瞬目検出による休憩催促アプリケーションの提案

2C2-1 瞬目群発を考慮したVDT作業における瞬目検出による休憩催促アプリケーションの提案

일부 중·고등학교 교사의 근골격계 불편증상 관련요인

Abstract This cross-sectional study was investigated musculoskeletal discomfort symptoms and related factors on some middle․high school teachers. Self-questionnaire of KOSHA CODE H-30-2003 was done with 250 teachers from 1st to 15th October, 2010, the data from 231 teachers (68 male, 163 female) was statistically analyzed to search the factors related to musculoskeletal discomfort symptoms. According to NIOSH rate of musculoskeletal discomfort symptoms by body parts was 36.8%. Musculoskeletal discomfort symptoms related to age, school types, subjective health status, housekeeping time, VDT work time and regular rest. After adjusting for related variables, odds ratio (OR) of musculoskeletal discomfort symptoms was correlation significantly to subjective health status unhealthy (OR 11.75, 95% Confidence Interval, CI, 3.56-378.78). In addition, ORs (95% CI) of age (40-49) and housekeeping time (≥3) were 4.63 (1.82-26.18) and 4.33 (1.97-19.34). Analysis of the factors influencing the musculoskeletal discomfort symptoms vary in different parts of the body. The most discomfort symptoms by parts was neck (26.0%) and shoulder (30.0%). In the neck region was related to subjective health status and regular rest. In the shoulder and waist region was subjective health status and sex. Age was wrist/finger, leg/foot was related to subjective health status, sex and VDT work time. Age, school types, subjective health status, housekeeping time, VDT work time and regular rest related to musculoskeletal discomfort symptoms and the most discomfort symptoms by parts was neck and shoulder.

Eye fatigue-reduction effect of wood rim cover on liquid crystal display

The purpose of this study is to confirm objectively by an instrumental measurement if there is less eye fatigue in VDT work when using a wood rim covered display than when using a plastic housing display. The subjects were 26 graduate and undergraduate university students. Each subject did the same 60-min VDT activity with both a plastic housing and wood-covered display. Before and after VDT activity, each subject’s near-point accommodation distance was measured by a near-point ruler. As a result, it was confirmed that variation rate of the near-point accommodation distance by the VDT work with the wood-covered display was smaller than with the plastic housing display. From sensory tests, progression of subjective symptoms such as eye pain and headache was less with the wood-covered display than with the plastic housing display.

1201 画像計測を用いたVDT作業に対する瞬きの計測システム(GS-15・16 画像計測)

1201 画像計測を用いたVDT作業に対する瞬きの計測システム(GS-15・16 画像計測)

Head Tracking Using Infrared Sensor of Home Gaming Console and an Application to Controlling a Mouse-Pointer in Multi-Monitor Display Environment

This paper describes the control method of a mouse-pointer in multi-monitor display environment by the proposed head tracking using infrared sensor of home gaming console, Wii. When an operator finds a mouse-pointer at the time of VDT work resumption, the proposed system is able to lighten his botheration.