Using Wavelet Transform for Speed Fluctuation Analysis During Manikin Carry with Fins

Susana Soares (), L.M. Machado, Vilas-Boas J.p, R.J. Fernandes, A. Toubekis and J.A. Abraldes
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R.J. Fernandes: Center of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Porto, Portugal
A. Toubekis: Division of Aquatic Sports, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, 17237, Athens, Greece
J.A. Abraldes: Department of Physical Activity and Sport, Faculty of Sports Sciences, University of Murcia, Murcia, Spain

The Open Sports Sciences Journal, 2017, vol. 10, issue 1, 272-278

Abstract: Background : Wavelet analysis has been used to locate speed variation changes in swimmers, but this elaborated technique was not so far tested in lifesavers carrying a manikin and using one upper limb and fins for propulsion. Objective : Our purpose was to examine the feasibility of using the wavelet analysis to locate time-points of speed variation changes in a manikin carry lifesaving race using stiff and fiber fins. Method : Fourteen male lifesavers with a mean age of 20.79±4.93 years performed two 25 m all-out manikin carry swimming races using one upper limb and stiff or fiber fins for propulsion. Speed was recorded with a speedometer and its variation was analysed using a wavelet transform analysis. Video recordings were used to measure stroke rate and stroke length within each race. Results : Wavelet analysis detected, for some lifesavers, one (stiff: 10.50±1.29 vs. fiber: 9.75±0.50 s; p>0.05) and, for other lifesavers, two time-points (stiff: 6.75±0.96 and 11.50±1.29; fiber: 7.00±1.41 and 12.00±1.83 s; p>0.05) of speed variation changes. Mean speed was no different with fin types (stiff: 1.38±0.06 vs. fiber: 1.42±0.09 m∙s-1; p>0.05), as well as average, maximum and minimum speed. Stroke rate, stroke length and stroke index did not change within each race. Conclusion : Wavelet analysis was effective in detecting one and two time-points of speed variation changes within a short duration manikin carry race independently of the type of fins used. Fiber and stiff fins showed similar biomechanical and speed variations within race changes.

Keywords: Fatigue; Fin type; Lifesaving; Speed variation; Sprint; Wavelet transform. (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:ben:tospsj:v:10:y:2017:i:1:p:272-278

DOI: 10.2174/1875399X01710010272

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