Kinematic analysis of butterfly turns of international and national swimmers

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Bibliographic Details
Title translated into German:Kinematische Analyse der Wenden beim Schmetterlingsschwimmen internationaler und nationaler Schwimmsportler
Author:Tourny-Chollet, C.; Chollet, D.; Hogie, S.; Papparodopoulos, C.
Published in:Journal of sports sciences
Published:20 (2002), 5, S. 383-390, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Language:English
ISSN:0264-0414, 1466-447X
Keywords:
Online Access:
Identification number:PU200911005896
Source:BISp

Abstract

The aims of this study were (1) to evaluate the different turn phases of 200 m butterfly during competition in a 50 m pool, (2) to determine if wall contact times are related to swim speed and (3) to compare the turn variables of a European Champion with other swimmers. In the first part of the study, we assessed the turns of 22 swimmers ranked in three groups according to 200 m butterfly swim performance (fast group = 121.73 +/- 3.03 s, intermediate group = 126.25 +/- 0.55 s, slow group = 129.24 +/- 2.30 s). Two turn times were recorded: the first before the turn (i.e. the time it takes the swimmer's head to reach the wall from 7.5 m away) and the second after the turn (i.e. the time from the wall to the point at which the swimmer's head passes 7.5 m away). The third turn was performed significantly faster by the fast group than by the slow group, both before (P<0.01) and after (P<0.02) the turn. In the second part of the study, objectives (2) and (3) were evaluated among 15 swimmers based on a specific protocol. Three cameras (50 Hz) simultaneously recorded the turn; these were placed above the water 10 m before the wall, 5 m before and just above the wall. Longer contact times of the feet on the wall were associated with a faster push-off speed (P<0.02). The European Champion achieved an improved contact time while performing a rapid pull-out speed. Verf.-Referat