ABSTRACT
Hormonal changes, e.g. rapidly increasing testosterone after age 12 y (Winter, 1978), leads to peak height and weight velocity during growth in boys at the age of around 14 y (Tanner et al., 1966). During the adolescent spurt, marked development in anthropometrical stature (Malina, 1991) andvarious performance tests (Mero, 1990) can also be observed. The purpose of this study was to examine the physical characteristics of 10-and 14-year-old Finnish males with reference to anthropometrics, hormonal levels and oxygen transport capacity of the blood cells.
