By the use of an ultrasound apparatus, the subcutaneous fat and muscle thicknesses at the forearm, upper arm, thigh and abdomen were determined in 158 boys and 161 girls aged from 50 to 79 months. The girls showed significantly thicker subcutaneous fat than the boys at the upper arm posterior, abdomen and thigh posterior, but the muscle thickness at every site was similar between the two genders. While the muscle thicknesses at all sites except for the upper arm were significantly correlated to age in both the boys and girls, the subcutaneous fat thicknesses were not.
