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Advisor(s)
Abstract(s)
The aim of this study was to compare the speed fluctuation and the
drag force in young swimmers between genders. Twenty-three
young pubertal swimmers (12 boys and 11 girls) volunteered as
subjects. Speed fluctuation was measured using a kinematical
mechanical method (i.e., speedo-meter) during a maximal 25-m
front crawl bout. Active drag, active drag coefficient and power
needed to overcome drag were measured with the velocity perturbation
method for another two maximal 25 m front crawl bouts
with and without the perturbation device. Passive drag and the
passive drag coefficient were estimated using the gliding decay
velocity method after a maximal push-off from the wall while
being fully immersed. The technique drag index was also assessed
as a ratio between active and passive drag. Boys presented meaningfully
higher speed fluctuation, active drag, power needed to
overcome drag and technique drag index than the girls. There were
no significant gender differences for active drag coefficient, passive
drag and passive drag coefficient. There were positive and moderate-
strong associations between active drag and speed fluctuation
when controlling the effects of swim velocity. So, increasing speed
fluctuation leads to higher drag force values and those are even
higher for boys than for girls.
Description
Keywords
Front crawl Hydrodynamics Active drag Passive drag Kinematics Children
Citation
Barbosa, Tiago M.; Costa, M.J.; Morais, J.E.; Morouço, P.; Moreira, M.; Garrido, N.; Marinho, D.A.; Silva, A.J. (2013). Characterization of speed fluctuation and drag force in young swimmers: a gender comparison. Human Movement Science. ISSN 0167-9457. 32:6, p. 1214-1225