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生长的长期趋势,是指最近一二百年以来,在发达国家中儿童青少年生长发育的普遍加快现象,也是当代最引入注目的生物现象之一。在欧美各国,该趋势已持续了好几代,而以第二次世界大战后表现得最为明显。在解放后的新中国,这一趋势也已出现,并开始对社会生活的各个方面产生影响。所谓长期趋势,实际上是一组复杂生物现象的综合体现。表现为各年龄儿童身高体重值的提高、生长速度的增加、青春发育期的提早出现和结束,以及更高大的成人体型等等。国内外儿童的长期趋势表现大致相同。 1.各发达工业国家儿童的长期趋势表现据文献报道,英国、北美、西欧及斯堪的纳维亚诸国的学龄儿童在1880—1950年的70年中,5—9岁者平均每10年身高增加1厘米,体重增加0.5公斤;青春期阶段则平均每10年身高增加2.5厘米,体重增加2.5公斤左右;当青少年达到成人身高时,其身高平均值每10年增
The long-term trend of growth refers to the general accelerated phenomenon of the growth and development of children and adolescents in developed countries in the recent one or two centuries and is also one of the most striking biological phenomena in our country. This trend has lasted for generations in Europe and the United States, and most obviously after World War II. In the new post-liberation China, this trend has also emerged and it has begun to have an impact on all aspects of social life. The so-called long-term trend is actually a complex manifestation of complex biological phenomena. The performance of children of all ages height and weight value increase, growth rate increased, early emergence and termination of puberty, and the larger adult size and so on. The long-term trends of children both at home and abroad show roughly the same. 1. Long-term trend performance of children in developed industrialized countries It has been reported in the literature that in the 70 years from 1880 to 1950, school-age children in Britain, North America, Western Europe and Scandinavia averaged 10 The height increases 1 centimeter, the weight increases 0.5 kilograms; The adolescent stage then increases the height every 10 years by 2.5 centimeters, the weight increases about 2.5 kilograms; When the youth reaches the adult height, its height average increases every 10 years