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现阶段,一些中小学的课余运动训练大量地安排在早上(课前)进行,这是不科学的。因为早上训练后,参训学生的机体消耗了大量的能量,血液中的糖元含量(血糖浓度)下降,而吃进食物到被机体吸收使血糖敞度恢复到正常值至少需要两个小时左右。早训练结束到上第一节课之间一个小时或稍多一点的时间里,参训学生要紧张地吃饭(注意:训练后即刻进食也不符合卫生要求),其训练产生的疲劳根本无时间去消除就进入了课堂,在正常情况下,一节课中中学生主动注意的时间为30分钟,小学生为20-25分钟,而机体疲劳和血糖浓度的降低将会使他们在一节课
At this stage, some extracurricular sports training in primary and secondary schools is arranged in large quantities in the morning (before class), which is unscientific. Because after morning training, the participating students’ body consumes a lot of energy, the sugar content (blood sugar concentration) in the blood drops, and it takes at least two hours to eat the food until it is absorbed by the body to restore the blood glucose level to normal. . From the end of the early training to the first lesson, an hour or more between the first lesson, the participants must eat nervously (Note: eating immediately after training does not meet the hygienic requirements), and the fatigue caused by their training has no time at all. To eliminate the entry into the classroom, under normal circumstances, a class of middle school students take the initiative to pay attention to the time for 30 minutes, primary school students for 20-25 minutes, and the body fatigue and blood glucose concentration will make them in a class