Semova N, Strashimirova T S, Kostova V, Pisev V, Shpangenberg S, Aleksandrova L, Lazarova R, Nedeva V, Todorova G, Damianova R
Probl Khig. 1990;15:131-41.
A study is carried out on 64 first grade school children for establishing the effect of computer training on the functional status of principally engaged systems with the purpose to determine the optimum duration of work with video terminal during the school day. The examinations are performed before and after computer lessons in mathematics and Bulgarian language in days with one and two lessons, and with the same subjects taught in the traditional way (control group). Traced are the changes in the accommodation, the eye rheobase, critical frequency of fusing the light flickers, resistance, volume and accuracy of the visual perception, static tremor and excretion of sodium and potassium in the saliva. The data point out to relatively higher pressure at work on video terminal in comparison with the traditional education. This imposes restriction in the duration of the lesson up to 20 minutes. The inclusion of second inconsistent computer lessons in the educational programme has no unfavourable effect on the functional status of the organism.
对64名一年级学童进行了一项研究，目的是确定计算机培训对主要参与系统功能状态的影响，以确定在校期间使用视频终端的最佳工作时长。在有一节和两节计算机数学课及保加利亚语课的日子里，以及在以传统方式教授相同科目的日子（对照组），分别在计算机课前后进行检查。记录了调节、眼视网膜阈、融合光闪烁的临界频率、视觉感知的阻力、容量和准确性、静态震颤以及唾液中钠和钾的排泄情况的变化。数据表明，与传统教育相比，使用视频终端工作时的压力相对较高。这就要求将课程时长限制在20分钟以内。在教育计划中加入第二节不连续的计算机课对机体功能状态没有不利影响。
