All participants were measured in summer months. Fat mass and extra cellular-to-intracellular water ratio were measured by bromide-deuterium dilution. Bone mineral density was measured by dual-energy x-ray absorptiometer with the use of a pediatric scan mode. Growth hormone function was measured by serum insulin-like growth factor-I concentration taken from a fasted venous blood sample. Physical activity was measured through daily metabolic rate and total body water as well as basal metabolic rate.