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Kinematic analysis as a part of objective method of functional classification in disability swimming – Pilot studies

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Dziuba A. K., Kolodziej A., Zurowska A.
Baltic Journal of Health and Physical Activity
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2013
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vol. 5
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issue 3
176-183
EN
Background:A new functional classification system (FCS) of disability swimming is based only on functional abilities in water. The aim of this research was to evaluate the possibility of kinematic analysis to supplement the FCS. Material/Methods: The investigations were carried out during the Polish Winter Disability Swimming Championships in 2008 and involved recording the results of the 100 m freestyle swimming event. Participants included 10 women and 11 men aged 21.7 ± 6.6. Results: The averages and standard deviations (SD) of stroke length (SL), stroke rate (SR), clean swimming speed (CSS) and stroke efficiency index (SI) were calculated. There is a strong negative correlation between SL and SR reaching 0.86 (p < 0.05) in particular classes. There were no statistically significant correlations between classes in the SL, CSS and SI parameters (p < 0.01) and no statistically significant differences were revealed in the Wilcoxon test (p < 0.01), which suggests that the division of swimmers into these classes was performed inaccurately and subjectively. Conclusions: Kinematic parameters could support FCS, and it might be an indicator of progress and the effectiveness of training methods for coaches.
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The influence of different hand paddle size on 100-m front crawl kinematics

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López-Plaza D., Alacid F., López-Miñarro P. A., Muyor J. M.
Journal of Human Kinetics
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2012
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vol. 34
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issue 1
112-118
EN
The purpose of this study was to determine the influence of different sizes of hand paddles on kinematic parameters during a 100 m freestyle swimming performance in elite swimmers. Nine elite swimmers (19.1 ± 1.9 years) completed three tests of 100 m without paddles, with small paddles (271.27 cm2) and with large paddles (332.67 cm2), respectively. One video camera was used to record the performance during the three trials. The mean swimming velocity, stroke rate and stroke length were measured in the central 10 meters of each 50 m length. The results showed that stroke length tended to increase significantly when wearing hand paddles (p < 0.05) during both the first and second 50 m sections whereas the increase in swimming velocity occurred only in the second 50 m (p < 0.05). Conversely, the stroke rate showed a slight decreasing trend with increasing paddle size. During the 100 m freestyle trial the stroke kinematics were changed significantly as a result of the increase in propelling surface size when hand paddles were worn.
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