Validity of the use of a fixed point for intracycle velocity calculations in swimming.

Psycharakis, Stelios and Sanders, Ross (2008) Validity of the use of a fixed point for intracycle velocity calculations in swimming. Journal of Science & Medicine in Sport, 12 (2). pp. 262-265. ISSN 1440-2440

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The intracycle velocity (V) of a fixed point on a swimmer’s body, usually the hip, is frequently calculated as a direct indication of the intracycle V of the centre of mass (CM). The purpose of this study was to examine whether the intracycle V of the hip reflects accurately the intracycle V of the CM in freestyle swimming. One stroke cycle was analysed for ten swimmers performing a maximum freestyle swim. The magnitude of differences between CM and hip values was calculated for the instantaneous V values, the intracycle V fluctuation (Vfluc) and the magnitude and timing of appearance of maximum (Vmax) and minimum intracycle V (Vmin). Large differences were found in all variables, with the use of the hip for V calculations overestimating significantly Vmax and underestimating significantly Vmin and Vfluc of the CM (p≤0.001). The results of this study showed that the hip motion should not be used as an indication of the intracycle CM motion in freestyle swimming.

Item Type: Article
Print ISSN: 1440-2440
Uncontrolled Keywords: Biomechanics; Three-dimensional; Centre of mass; Hip; Freestyle; Accuracy;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 600 Technology > 610 Medicine & health > 612 Human physiology
700 Arts & recreation > 790 Sports, games & entertainment > 797 Aquatic & air sports
Library of Congress Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Item ID: 2472
Depositing User: Dr. Stelios Psycharakis
Date Deposited: 26 Jan 2009 16:47
Last Modified: 11 Feb 2013 16:04

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