Roentgenographic Measures of Leg Muscle Size and Ankle Extensor Strength of Seven-Year-Old Children

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Abstract
The purpose of this study was (1) to determine the relationship between roentgenographic measures of muscle size of the leg and ankle extensor strength of 51 seven-year-old children, and (2) to examine sex differences in strength and leg muscle size at this age level. The correlations between ankle extensor strength and the measures of leg muscle size ranged between .58 and .63 for the boys and between .22 and .52 for the girls. The boys were substantially stronger than the girls in ankle extensor strength (P = .02) and possessed on the average the greater muscle size. When boys and girls were paired on the basis of measures of muscle size, the superiority of the boys in strength was significant at only the 30-per-cent level of confidence.