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Advisor(s)
Abstract(s)
The aim of this study was to analyze the changes in the hydrodynamic proļ¬le of young swimmers over a competitive season and to compare the variations according to a well-designed training periodization. Twenty-ļ¬ve swimmers (13 boys and 12 girls) were evaluated in (a) October (M1); (b) March (M2); and (c) June (M3). Inertial and anthropometrical measures included body mass, swimmerās added water mass, height, and trunk transverse surface area. Swimming efļ¬ciency was estimated by the speed ļ¬uctuation, stroke index, and approximate entropy. Active drag was estimated with the velocity perturbation method and the passive drag with the gliding decay method. Hydrodynamic dimen- sionless numbers (Froude and Reynolds numbers)
and hull velocity (i.e., speed at Froude number = 0.42) were also calculated. No variable presented a signiļ¬cant gender effect. Anthropometrics and inertial parameters plus dimensionless numbers increased over time. Swimming efļ¬ciency improved between M1 and M3. There was a trend for both passive and active drag increase from M1 to M2, but being lower at M3 than at M1. Intra-individual changes between evaluation moments suggest high between- and within-subject variations. Therefore, hydrodynamic changes over a season occur in a non-linear fashion way, where the interplay between growth and training periodization explain the unique path ļ¬ow selected by each young swimmer.
Description
Keywords
Young swimmers
Citation
Barbosa, Tiago M.; Morais, J.E.; Marques, M.C.; Silva, A.J.; Marinho, D.A.; Kee, Y.H. (2014). Hydrodynamic proļ¬le of young swimmers: changes over a competitive season. Scandinavian Journal of Medicine and Science in Sports. ISSN 0905-7188. 25, p. e184āe196
Publisher
John Wiley & Sons