Bridge role of Jingming (BL 1) for VDT asthenopia and brainfag based on human instinct / 中国针灸

To explore the bridge role of Jingming (BL 1) for video display terminal (VDT) asthenopia and brainfag. Ancient literature and modern scientific research on the acupoint have been analyzed and summarized so as to explore pressing the acupoint the instinct feedback of brain after asthenopia. It is demonstrated that Jingming (BL 1) is a key channel between eyes, brain and the outside world, and it is one of major feedback points of brain after asthenopia. In this paper we try to establish a new research thinking and ascertain it, namely Jingming (BL 1) reflecting the relationship between asthenopia and brainfag. We hope that it can provide some references for further research on cognizing brain through eye.

Working Posture and Muscle Tension according to Screen Position during VDT Operation

OBJECTIVE: To evaluate working condition in way of measuring working posture and muscle tension using the desktop personal computer and notebook personal computer having different screen height. METHOD: Seventeen healthy men performed wordprocessing task in three workstation: desktop PC on the conventional computer table (DPC (on)); desktop PC under the 'inside' type computer table (DPC (under)); notebook PC on the table (NPC). The viewing distance and angle, head and neck angle, thoracic bending and trunk inclination were measured. Muscle tension of right posterior neck muscle, upper trapezius, sternocleidomastoid (SCM), and upper back muscle was also measured by integrated electromyogram (IEMG). RESULTS: 1) The viewing distance was the longest in DPC (under). 2) The lower the screen height, the more downward viewing angle and more flexed position in upper neck. 3) The posterior neck muscle tension was the lowest in DPC (on). 4) Stooped position was most frequently seen in NPC and the highest tension of posterior neck muscle and upper back muscle was shown in NPC. 5) In relation between postural analysis and muscle tension, muscle tension decreased with increasing backward reclining position, and the neck and thorax became more erect with increasing in viewing distance. CONCLUSION: These results suggest that the stooped posture was worst and most frequently seen in NPC. If neck flexion is avoided, DPC (under) position could lessen the visual and musculoskeletal problem. More Ergonomical study would be needed about working posture using computer.

THE STUDY OF OCCUPATIONAL HAZARDS OF VDT / 西安交通大学学报(医学版)

Both monitoring of occupational hazards and assessment of healthy effects on VDT operators were made. The results showed that there were several occupational hazards in VDT,including insalubrious microclimate and air ion condition, lower illuminance, higher noise, some doses of x-radiation, and unfitting ergonomics. The healthy effects of the hazards of the VDT mainly involved the operator's nervous system, psychology and behavior, eyes, musculoskeletal system as well as the woman operator's menses and pregnancy, especially in the 18 to 25 age bracket who had more VDT work hours than that of the others, it suggested that the various preventive measures against the hazards of the VDT must be strengthened.

VDT OPERATORS' OCCUPATIONAL STRESS AND PSYCHOPHYSICAL STATE / 西安交通大学学报(医学版)

VDT operators' occupational stress and psy-chophysical state were studied. The resultsshowed that the nature, environment and require-ments of VDT operation shaped the major occupa-tional stress in VDT operation. The longer VDTworking hours and more workloads gave the opera-tors more occupational strains. VDT operators hada lower satisfactory level to the job and lower psy-chological health level than contral group, espe-cially on obsession and depression. VDT operationperhaps gave the operators some kinds of psycho-physiological troubles. We did not find there wereharmful effects of VDT on the operators' autonom-ic nervous functions.