A model for active drag force exogenous variables in young swimmers
Abstract
The aim of the current study was to develop a structural equation modeling (i.e., path-flow analysis model) for active drag force based on anthropometric, hydrodynamic and biomechanical variables in young swimmers. The theoretical model was developed according to main review papers about these determinants. Sixteen male swimmers (12.50±0.51 years-old; Tanner stages' 1-2) were evaluated. It was assessed: (i) anthropometrical variables such as body mass, height, frontal surface area; (ii) hydrodynamic variables including drag coefficient and active drag with the velocity perturbation method; (iii) the biomechanical variables stroke length, stroke frequency and swimming velocity after a maximal 25-m bout. Path-flow analysis was performed with the estimation of linear regression standardized coefficients between exogenous and endogenous variables. To verify the model fit, root mean square residual was computed. The active drag presented significant association with all exogenous variables, except for stroke length and stroke frequency. Confirmatory model excluded the frontal surface area (RMSR>0.1). Even so, 95% of active drag was explained by remaining variables in the model. Confirmatory path-flow model can be considered as not suitable of the theory. In order to increase the model fit, in a near future it is advice to develop new frontal surface area estimation equations specific for young swimmers rather than using models developed with adult/elite swimmers.
Keywords
References
Arellano, R., Pardillo, S., Gavilan, A. Usefulness of the Strouhal number in evaluating human under-water undulatory swimming. In: JC Chatard (ed.). Biomechanics and Medicine in Swimming IX. University of Saint-Etienne: Saint-Etienne; 2003, pp. 33-38.
Barbosa, T.M., Bragada, J.A., Reis, V.M., Marinho, D.A., Carvalho, C., Silva, A.J. Energetics and biomechanics as determining factors of swimming performance: updating the state of the art. J Sci Med Sports. 2010a; 13: 262-269. https://doi.org/10.1016/j.jsams.2009.01.003
Barbosa, T.M., Costa, M.J., Marinho, D.A., Coelho, J., Moreira, M., Silva, A.J. Modeling the links between age-group swimming performance, energetic and biomechanic profiles. Ped Exerc Sci. 2010b; 22:379-391. https://doi.org/10.1123/pes.22.3.379
Barbosa, T.M., Fernanes, R.J., Keskinen, K.L., Colaço, P., Cardoso, C., Silva, J., Vilas-Boas, J.P. Evaluation of the energy expenditure in competitive swimming strokes. Int J Sports Med. 2006; 27: 894-899. https://doi.org/10.1055/s-2006-923776
Clarys, J.P. Human morphology and hydrodynamics. In: Terauds J and Bedingfield EW (Eds). Swimming III. University Park Press: Baltimore; 1979, pp. 3-41.
Craig, A., Pendergast, D. Relationships of stroke rate, distance per stroke and velocity in competitive swimming. Med Sci Sports Exerc. 1979; 11:278-283. https://doi.org/10.1249/00005768-197901130-00011
Grimston, S.K., Hay, J. Relationship among anthropometric and stroking characteristics of college swimmers. Med Sci Sports Exerc. 1986; 18:60-68. https://doi.org/10.1249/00005768-198602000-00011
Huijing, P., Toussaint, H.B., Mackay, R., Vervoon, K., Clarys, J., Hollander, A.P. Active drag related to body dimensions. In: B Ungerechts, K Wilke, K Reischle (Eds). Swimming Science V. Human Kinetics Books: Champaign, Illinois; 1988, pp. 31-37.
Kjendlie, P.L., Stallman, R.K. Drag characteristics of competitive swimming children and adults. J Appl Biomech. 2008; 24:35-42. https://doi.org/10.1123/jab.24.1.35
Kolmogorov, S.V., Duplisheva, A. Active drag, useful mechanical power output and hydrodynamic force coefficient in different swimming strokes at maximal velocity. J Biomech. 1992; 25:311-318. https://doi.org/10.1016/0021-9290(92)90028-Y
Lavoie, J.M., Montpetit, R. Applied Physiology of swimming. Sports Med. 1986; 3:165-188. https://doi.org/10.2165/00007256-198603030-00002
Marinho, D.A., Barbosa, T.M., Costa, M.J., Figueiredo, C., Reis, V.M., Silva, A.J., Marques, M.C. Can 8-weeks of training affect active drag in young swimmers? J Sports Sci Med. 2010; 9:71-78.
Schidt, A., & Ungerechts, B.E. The effect of cognitive intervention on stroke distance in age-group swimmers. In: T Nomura, BE Ungerechts (Eds.). The Book of Proceedings of the 1st International Scientific Conference of Aquatic Space Activities. University of Tskuba: Tsubuka; 2008, pp. 380-387.
Silva, A.J., Costa, A.M., Oliveira, P.M., Reis, V.M., Saavedra, J., Perl, J., Rouboa, A., Marinho, D.A. The use of neural network technology to model swimming performance. J Sports Sci Med. 2007; 6:117-125.
Tousssaint, H., Roos, P., Kolmogorov, S. The determination of drag in front crawl swimming. J Biomech. 2004; 37:1655-1663. https://doi.org/10.1016/j.jbiomech.2004.02.020
DOI: https://doi.org/10.4100/jhse.2010.53.08
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