Biomechanical characterization of swimmers with physical disabilities

  • Valdir Junior Research Group in Biodynamic Human Movement, Institute of Physical Education and Sport, Federal University of Ceara
  • Alexandre Medeiros Research Group in Biodynamic Human Movement, Institute of Physical Education and Sport, Federal University of Ceara
  • Kelly Jesus Human Performance Studies Laboratory, Faculty of Physical Education and Physiotherapy, Federal University of Amazonas http://orcid.org/0000-0001-5516-4756
  • Nuno Domingos Garrido Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD) http://orcid.org/0000-0002-8105-7580
  • Rui Corredeira Research Center in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto
  • Daniel Daly Catholic University of Leuven
  • Ricardo Jorge Fernandes Centre of research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto http://orcid.org/0000-0002-5811-0443

Abstract

The evaluation of swimming technique is one of the main aspects to be considered in any training program, with biomechanics being an important source of knowledge. It was our objective to characterize the biomechanical parameters (SL and SF) relating them to the swimming velocity (v) at different intensities and to analyze within each swimming stroke cycle the intra-cyclic velocity variation (IVV) in a group of motor disabled swimmers. Eight disabled male swimmers (25.83 ± 2.93 years old, 72.45 ± 9.26 kg body mass and 1.79 ± 0.11 m of height) of the following functional classes: S6 (n = 1), S8 (n = 2) and S9 (n = 5) participated in this study. Swimmers were evaluated in the kinematic parameters v, stroke frequency (SF) and stroke length (SL) along with an incremental protocol of 6 x 200 m in the the crawl stroke. Data were registered in each step at the distances of 100 and 175 m. With increasing velocity, the mean values of SL decreased while the mean values of SF increased. To achieve higher swimming velocities, swimmers compensated the lack of the propulsive segment increasing SF to increase swimming speed. For the mean values of IVV at 100m distance, a decrease between the first and second levels, followed by a tendency to stabilize from the 2nd to the 6th level is presented. For the 175 m distance, there was a decrease in IVV with an increase in swimming velocity. Stroke frequency is directly related to the magnitude of IVV, which directly influences swimming performance.

Published
2018-12-16
Section
Original Article