Percorrer por autor "Pendergast, David"
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- Comparison of classical kinematics, entropy, and fractal properties as measures of complexity of the motor system in swimmingPublication . Barbosa, Tiago M.; Goh, Wan X.; Morais, J.E.; Costa, M.J.; Pendergast, DavidThe aim of this study was to compare the non-linear properties of the four competitive swim strokes. Sixty-eight swimmers performed a set of maximal 4 × 25 m using the four competitive swim strokes. The hip's speed-data as a function of time was collected with a speedo-meter. The speed fluctuation (dv), approximate entropy (ApEn) and the fractal dimension by Higuchi's method (D) were computed. Swimming data exhibited non-linear properties that were different among the four strokes (14.048 ≤ dv ≤ 39.722; 0.682 ≤ ApEn ≤ 1.025; 1.823 ≤ D ≤ 1.919). The ApEn showed the lowest value for front-crawl, followed by breaststroke, butterfly, and backstroke (P < 0.001). Fractal dimension and dv had the lowest values for front-crawl and backstroke, followed by butterfly and breaststroke (P < 0.001). It can be concluded that swimming data exhibits non-linear properties, which are different among the four competitive swimming strokes.
- Comparison of classical kinematics, variability and nonlinear parameters for the four competitive swimming strokesPublication . Barbosa, Tiago M.; Costa, M.J.; Morais, J.E.; Pendergast, DavidThe aim of this research was to compare classical kinematic and nonlinear parameters in the four competitive swimming strokes
- Fractal analysis of human aquatic locomotion: an exploratory and descriptive studyPublication . Barbosa, Tiago M.; Morais, J.E.; Costa, M.J.; Seifert, Ludovic; Pendergast, DavidFractal analysis has recently been applied to study a wide range of objects/systems in Biology and Medicine to assess non-linear phenomena. Human swimming is a non-linear behavior and as much as we are aware, no fractal research was conducted in such locomotion technique.