脑力劳动是一类长期从事室内工作(如伏案书写、埋头阅读材料),姿势单调,缺乏运动,而思维异常频繁的劳动,如教师和学生的日常活动等。脑力劳动者的代谢特点是,机体耗能少,而脑细胞代谢活跃。据大脑生物学研究表明:一个成年人大脑重量仅为体重的2%,但却有全身血量的20%被输送到大脑。可见,大脑是身体中的耗能大户,而脑力劳动 Mental work is a type of work that has long been engaged in indoor work (such as writing desks and reading materials), monotonous posture, lack of exercise, and unusually frequent thinking, such as the daily activities of teachers and students. The metabolic characteristics of mental workers are that the body consumes less energy while brain cells are metabolically active. According to brain biology studies, an adult brain weighs only 2% of body weight, but 20% of the body’s blood is delivered to the brain. It can be seen that the brain is a large energy consumer in the body and mental work