Central European Journal of Sport Sciences and Medicine


ISSN: 2300-9705     eISSN: 2353-2807    OAI    DOI: 10.18276/cej.2016.3-01
CC BY-SA   Open Access   DOAJ  DOAJ

Issue archive / Vol. 15, No. 3/2016
Integrated Dynamometric, Kinematic and Electromyographic Characterisation of a Swimming Track Start Block Phase – A Pilot Study

Authors: Manuel Vítor
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal ; Porto Biomechanics Laboratory, University of Porto, Portugal

Karla de Jesus
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal ; Porto Biomechanics Laboratory, University of Porto, Portugal

Luís Mourão
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal ; ESEIG, School of Management and Industrial Studies, Polytechnic Institute of Porto, Portugal

Sara Tribuzi
Porto Biomechanics Laboratory, University of Porto, Portugal

Pedro Gonçalves
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal

Mariana Marques
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal

Hélio Roesler
Biomechanics Laboratory, Santa Catarina State University, Brazil

Mário Vaz
Porto Biomechanics Laboratory, University of Porto, Portugal ; FEUP, Faculty of Engineering, INEGI, University of Porto, Portugal

João Paulo Vilas-Boas
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal ; Porto Biomechanics Laboratory, University of Porto, Portugal

Ricardo J. Fernandes
Centre of Research, Education, Innovation and Intervention in Sport, Faculty of Sport, University of Porto, Portugal ; Porto Biomechanics Laboratory, University of Porto, Portugal
Keywords: Biomechanics Dynamometry Kinematics Electromyography Swimming
Whole issue publication date:2016
Page range:10 (5-14)
Cited-by (Crossref) ?:

Abstract

This study presents a complete biomechanical analysis of the block phase of a swimming modified track start. Kinetic, kinematic and electromyography (EMG) data were collected. The forces produced by the swimmer on the block, the EMG of eight muscles and the kinematics of the centre of mass (CM) were recorded. A national-level swimmer performed three repetitions of a track start in a dynamometric starting block. Temporal instants ‘reaction time’, ‘hands take-off’, ‘rear foot take-off’ and ‘front foot take-off’ were identified. Results show the peak forces (Fmax) produced by the most dynamic limb in each sub-phase delimited by mentioned instants (right hand take-off: Fmaxvertical = 103 N; rear foot take-off: Fmaxantero-posterior = 524 N; front foot take-off: Fmaxvertical = 634 N). The CM revealed a descendent vertical trajectory along the block phase. Mean resultant speed at front foot take-off was 4.092m/s. The muscles with highest values of integral EMG (iEMG) were the tibialis anterior during hands take-off, Biceps Femoris and Gluteus Maximus during rear foot take-off, respectively 41.17%, 52.96% and 36.37% of the maximum isometric voluntary contraction (%MIVC). The study demonstrates an effective characterisation of the block phase in swimming starts with potential to evaluate the swimmers performance in the track start, using different back plate positioning.
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