Abstract
The secular trend in physical growth-that is, the long-term tendency toward changes in height, weight, and other body measurements-has been observed in most populations for which adequate data exist. Despite extensive research, this phenomenon has not been fully explained in the literature and persists as one of the more challenging problems in human biology. The secular trend of increasing size and earlier maturation has been well documented in Great Britain by Boyne et al. (1957), Clements (1953), and Weir (1952). Meredith and Meredith (1944) have reported the secular trend in stature of Canadian children. When compared with earlier studies of Swedish school pupils and adults, the findings of Abramson and Ernest (1954), Broman et al. (1942), and Holmgren (1952) revealed marked increases in height and weight for age. Greulich (1957), Gruenwald et al. (1967), Insull et al. (1968), and Mitchell (1964) have discussed the secular trend in physical growth evident in Japan, particularly since World War II.
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