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由于学习负担重及电视与计算机的普及,静态活动过多已成为当前学生面临的一个主要健康危险行为。美国1997年青少年健康危险行为监测发现,和10 a前比,小学生每天参加体育课和课外锻炼人数比例从98.0%降至52.0%,初中生从88.0%降至38.2%,高中生从76.0%降至37.8%[1]。美国中学生2000年平均每天看电视、玩游戏机、上网时间分别为3.3,0.8和1.5 h[2]。一项2007年针对北京中学生的调查显示,
Due to the heavy learning burden and the popularization of television and computer, excessive static activities have become a major health risk facing students. According to the monitoring of adolescent health risk behaviors in the United States in 1997, the percentage of primary school children participating in physical education classes and extra-curricular activities decreased from 98.0% to 52.0% and from 88.0% to 38.2% and from highs to 76.0% To 37.8% [1]. American secondary school students watched TV on an average daily basis in 2000 and played video game consoles at 3.3, 0.8 and 1.5 hours respectively [2]. According to a 2007 survey of secondary school students in Beijing,