目的分析台阶指数在学生体质健康监测中的作用。方法对参与2004年全国学生体质监测的12、14、17岁男女生36237人进行台阶试验,并采用运动时间、恢复期心率计算台阶指数,通过分析不同群体台阶指数的变化特点,比较超重、肥胖和正常体重者的台阶指数水平。结果台阶指数均值和群体的体格发育水平呈相反趋势,乡村学生显著高于城市学生,南方学生略高于北方学生;中下经济水平的乡村学生群体水平最高,而省会城市学生的群体水平最低,原因主要为高经济水平群体的生活方式改变,缺乏锻炼,身体负重量大等因素有关。不同营养状况群体的台阶指数呈肥胖者<超重者<正常体重者依次下降,组间差异有统计学意义,提示肥胖和超重对心血管功能的有害影响。结论台阶试验简便易行、安全,应成为今后学生体质健康监测的常规指标。 Objective To analyze the role of the step index in the students’ physical health monitoring. Methods A total of 36237 boys and girls aged 12, 14 and 17 participated in the national student body monitoring in 2004 were enrolled in this study. The tread index was calculated by exercise time and heart rate during convalescence. By analyzing the characteristics of different groups’ step index, And normal weight those who step index level. Results The average of step index and the group’s physical development showed the opposite trend. The rural students were significantly higher than the urban students, the students in the south were slightly higher than the students in the north. The middle and lower economic level of the rural students was the highest while that of the provincial capital was the lowest. The main reasons for the high economic level groups lifestyle changes, lack of exercise, body weight and other factors. The step indexes of different nutritional status groups were obese