Int J Sports Med 2005; 26(6): 471-475
DOI: 10.1055/s-2004-821110
Orthopedics & Biomechanics

© Georg Thieme Verlag KG Stuttgart · New York

Intracyclic Velocity Variations and Arm Coordination During Exhaustive Exercise in Front Crawl Stroke

M. Alberty1 , M. Sidney1 , F. Huot-Marchand1 , J. M. Hespel1 , P. Pelayo1
  • 1Laboratoire d'Etudes de la Motricité Humaine, Faculté des Sciences du Sport, Université de Lille 2, France
Further Information

Publication History

Accepted after revision: April 21, 2004

Publication Date:
22 December 2004 (online)

Abstract

The purpose of this study was to analyse the effects of an exhaustive exercise on arm coordination and intracyclic velocity variations (IVV) to better understand the ways in which they are modified under fatigue conditions. Seventeen competitive swimmers performed a 200-m all-out test and a set of two 25-m (before and after the 200-m) at maximal intensity to measure stroking parameters, IVV, and the relative duration of the different parts of the stroke cycle and identify the model of arm coordination by using the index of coordination (IdC). Results showed an increase in the relative duration of the propulsive time, which induced a change in arm coordination as fatigue developed in relation to a decrease in stroke length (SL) and stroke rate (SR) (p < 0.05). The evolution of IdC corresponds to a reduction of the non-propulsive lag time between the two arms' propulsive actions. Despite these modifications, IVV were not significantly modified (p < 0.05). The present results highlighted that IdC and relative durations of each part of the cycle (particularly the pull phase) could be assessed to complete the “SL × SR” model and to partly understand the technique modifications under fatigue condition.

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