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The effect of 25 M versus 50 M course length on backstroke performance – An analysis of national and international swimmers


Janoschka, A; Wolfrum, M; Knechtle, B; Rüst, C A; Rosemann, T; Lepers, R (2014). The effect of 25 M versus 50 M course length on backstroke performance – An analysis of national and international swimmers. Journal of Athletic Enhancement, 3:1.

Abstract

Background: The aims of the present study were (i) to examine effects of course length (25 m versus 50 m) on backstroke performance and (ii) to analyse the changes in 25 m and 50 m courses backstroke performance across years during the 2000- 2013 period, for both women and men at national (Switzerland) and international (finals of the FINA World Championships) level.
Methods: Backstroke swim performances were analysed for 53,849 swimmers ranked on the national Swiss high score list, and for 624 swimmers competing in the finals of the FINA World Championships, in 50 m, 100 m, and 200 m races, during 2000- 2013. Analysis of variance was used to compare swim speeds for different groups, and linear regression was used to determine statistical significance of temporal trends.
Results: National and international athletes were on average 4.3% faster on short courses than on long courses, for both sexes and over all race distances. Sex-related differences in swim speed were greater on short courses than on long courses for international athletes over all distances, and for national athletes in 200 m races. Swim performance improved for both international (r2=0.61–0.90, p=0.004-0.04) and national swimmers (r2=0.32–0.65, p=0.001- 0.04) in short- and long course events. Sex-related differences in backstroke swim performance showed no change over time.
Conclusions: These results indicate that elite backstroke swimmers were significantly faster on 25 m courses than on 50 m courses, irrespective of sex and race distance. International and national swimmers improved performance in short- and long-course races during the 2000-2013 period. Further studies are required to determine whether course length has similar effects on other swim styles.

Abstract

Background: The aims of the present study were (i) to examine effects of course length (25 m versus 50 m) on backstroke performance and (ii) to analyse the changes in 25 m and 50 m courses backstroke performance across years during the 2000- 2013 period, for both women and men at national (Switzerland) and international (finals of the FINA World Championships) level.
Methods: Backstroke swim performances were analysed for 53,849 swimmers ranked on the national Swiss high score list, and for 624 swimmers competing in the finals of the FINA World Championships, in 50 m, 100 m, and 200 m races, during 2000- 2013. Analysis of variance was used to compare swim speeds for different groups, and linear regression was used to determine statistical significance of temporal trends.
Results: National and international athletes were on average 4.3% faster on short courses than on long courses, for both sexes and over all race distances. Sex-related differences in swim speed were greater on short courses than on long courses for international athletes over all distances, and for national athletes in 200 m races. Swim performance improved for both international (r2=0.61–0.90, p=0.004-0.04) and national swimmers (r2=0.32–0.65, p=0.001- 0.04) in short- and long course events. Sex-related differences in backstroke swim performance showed no change over time.
Conclusions: These results indicate that elite backstroke swimmers were significantly faster on 25 m courses than on 50 m courses, irrespective of sex and race distance. International and national swimmers improved performance in short- and long-course races during the 2000-2013 period. Further studies are required to determine whether course length has similar effects on other swim styles.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Institute of General Practice
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2014
Deposited On:22 May 2014 08:32
Last Modified:05 Apr 2016 17:53
Publisher:SciTechnol
ISSN:2324-9080
Publisher DOI:https://doi.org/10.4172/2324-9080.1000137

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