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为了解青少年身体素质的增长规律、特点及基本趋势，采用年增长值＋0．5s的方法，对云南省汉、纳西、哈尼、佤和傈僳五个民族学生，身体素质在自然增长过程中敏感期趋势进行分析。结果表明：身体素质在自然增长过程中存在着低年龄组增长量大（除柔韧素质外），且呈阶段性增长的特点，男生速度、耐力等项身体素质有随年龄增长而增长的趋势；女生进入青春期后，多个年龄组、多项身体素质呈缓慢增长和负增长，除男生下肢爆发力和女生柔韧性外，各项身体素质第一敏感阶段增长量均高于第二敏感阶段，且差异有显著性（P＜0．05）。这些规律、特点和差异可为我省学校体育教学、运动训练、选材及体育科研提供依据。
In order to understand the law of growth, characteristics and basic trends of adolescent’s physical fitness, the five national minority students of Han, Naxi, Hani, Wa and Qionglai in Yunnan province were selected during the natural growth process Trend analysis. The results showed that there was a big increase (except for the flexible quality) in the growth of the physical quality in the low age group, and the characteristics of growth were staged. The physical quality of boys such as speed and endurance tended to increase with age. After adolescence and adolescence, girls in various age groups showed a slow growth and a negative growth in a number of physical qualities. Except for boys ’lower extremity explosive force and girls’ flexibility, the growth of the first sensitive stage of physical fitness was higher than that of the second sensitive stage, There was significant (P <0.05). These rules, characteristics and differences can provide the basis for physical education, sports training, material selection and sports scientific research in our province.