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The influence of stroke mechanics into energy cost of elite swimmers

Title
The influence of stroke mechanics into energy cost of elite swimmers
Type
Article in International Scientific Journal
Year
2008
Authors
Tiago Barbosa
(Author)
Other
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Ricardo Fernandes
(Author)
FADEUP
Kari Keskinen
(Author)
Other
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João Paulo Vilas Boas Soares Campos
(Author)
FADEUP
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Journal
Vol. 103 No. 2
Pages: 139-149
ISSN: 1439-6319
Publisher: Springer Nature
Indexing
Pubmed / Medline
Scientific classification
FOS: Social sciences > Other social sciences
CORDIS: Social sciences > Educational sciences > Education > Physical education > Sport
Other information
Abstract (EN): The purpose of this study was to analyze the relationships between energy cost (C), swimming velocity (v), stroke frequency (SF) and stroke length (SL) in toplevel swimmers. Eighteen elite swimmers (four freestylers, five backstrokers, five breaststrokers and four butterflyers) performed an intermittent set of n 9 200 m swims (n B 8) with increasing velocity. The oxygen consumption was measured breath-by-breath by a portable metabolic cart (K4 b2, Cosmed, Rome, Italy). A respiratory snorkel and valve system with low hydrodynamic resistance was used to measure pulmonary ventilation and collect expiratory gases. Blood samples were taken from the ear lobe before and after each swim to analyze the blood lactate concentration (YSI 1500L, Yellow Springs, OH, USA). At Backstroke, Breaststroke and Butterfly strokes, increases of SF were associated to increases of C, even when controlling the v. The increases in SL only promoted significant decreases in the C in Breaststroke. There was a significant and polynomial relationship between v and SF for all competitive swimming techniques. The polynomial relationship between v and SL was significant only in Freestyle and Butterfly stroke. Partial correlations between v and SF controlling the effect of SL and between v and SL controlling the effect of SF, were positive and significant for all techniques. It is concluded that manipulation of stroke mechanics variables (SF and SL) may be one of the factors through which C in competitive swimming can be altered for a given v.
Language: English
Type (Professor's evaluation): Scientific
Contact: ricfer@fade.up.pt
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