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This study aimed to: (i) analyze the participation of male masters swimmers in the last national championships in the 50 and 100 m freestyle competitions; (ii) develop a prediction of results for the next masters national championships and world championships. We analyzed the participation of all male athletes in the last five summer national championships in all age groups in competitions of 50 and 100m freestyle, and for the preparation of the performance, all chronometric records of the first ranked in the national and world championships in the referred competitions and ages were used. To calculate the prediction of results, we used the polynomial y = (-) ax ² - bx + c, with the aid of Excel software (2003, Windows). Changes at the level of male participation in the national championships according to the age group of the competition and the respective year of participation were analyzed. Regarding the predictions verified, we observed that there is a tendency for new national and world records. In summary, predicting the competitive level in this category (masters) is critical to defining the achievement of new goals and targets. [ABSTRACT FROM AUTHOR]

Propulsive efficiency is one of the most interesting issues for competitive swimming researchers, has it presents significant relationships with the swimmer's biophysical behavior and his/her performance. Although propulsive efficiency is a variable that has been quite studied in elite swimmers, there is no research on this issue in young and non-expert swimmers. Thus, the aim of this study was to: (i) estimate the propulsive efficiency on non-expert swimmers; (ii) identify biomechanical and anthropometrical parameters that are associated with propulsive efficiency; (iii) identify the association between the propulsive efficiency and swim performance. Twenty-eight non-expert swimmers participated on this study. It was assessed the propulsive efficiency, biomechanical and anthropometrical parameters, as well as, the swim performance. The propulsive efficiency of non-expert swimmers is lower than data reported in the literature to higher competitive levels swimmers and there are no significant differences between boys and girls. It was also noted that several biomechanical and anthropometrical parameters, as well as, the swim performance are associated with the propulsive efficiency. [ABSTRACT FROM AUTHOR]