The purpose of this study was to investigate the changes brought about both by this development and by training on anthropometrics, swimming, flexibility and CMJ force recordings variables over a period of three years (2000-2003) of swimming training in a sample of age-group swimmers. The improvement obtained in swimming times seems related to a combination of anthropometrics factors plus absolute and relative force development after ending this long-term period of swimming age-group training, but the growing changes seems to produce a masking effect on the force evolution observing the relative force results. Considering that we evaluated the general jumping force, not strictly related with the swimming needs, it is difficult to recommend, to this group of age-group swimmers, the application of a rigid and progressive strength-training program.
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