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Abstract
Fifteen boys and girls who were undertaking their first competitive age-group swimming training were studied before and after 7 months of training and compared to a similar group of control subjects. Measurements were obtained on percent fat, lean body weight, and somatotype, and on tests of muscular endurance and strength. No significant changes over controls were found for the body composition variables (p > .05), or the measures of body strength (p > .05). Significant increases occurred in muscular endurance (p < .05), but the rate of local muscular fatigue remained constant. It was concluded that the main effect of competitive swimming training is to increase muscular endurance, not muscular strength or components of body composition.