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做任何一件事,如果没有科学的指导,常常事与愿违。体育锻炼也是这样,只有科学的适宜的体育锻炼才真正有益于健康。中小学生在锻炼时要注意哪些问题呢? ▲锻炼时间国家有关部门规定,中小学生每天至少要保证一小时的体育锻炼时间。除了在学校锻炼外,在家自我锻炼时间安排在什么时间合适呢?对于城市学生来说,最好在早晨交通高峰时间以前,这时街上比较清静,空气污染也轻,一氧化碳的浓度只有早晨7～8点钟时的1:2～1:4,到8～9点钟,空气中一氧化碳浓度将增加到10倍以上。清晨锻炼,可
Do any one thing, if there is no scientific guidance, often contrary to expectations. The same is true of physical exercise, only scientific and proper physical exercise is really beneficial to health. Primary and secondary school students should pay attention to what issues when exercising? Exercise time State departments, primary and secondary students every day to ensure at least one hour of physical exercise time. In addition to school workout, at home what time fit exercise time for it? For urban students, it is best in the morning before the rush hour, when the street is relatively quiet, air pollution is light, the concentration of carbon monoxide only morning 7 ~ 8 o’clock at 1: 2 ~ 1: 4, to 8 ~ 9 o’clock, the carbon monoxide concentration in the air will increase to more than 10 times. Morning exercise can be