Stelios G. Psycharakis
Validity of the use of a fixed point for intracycle velocity calculations in swimming
Psycharakis, Stelios G.; Sanders, Ross H.
Authors
Ross H. Sanders
Abstract
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.
Citation
Psycharakis, S. G., & Sanders, R. H. (2009). Validity of the use of a fixed point for intracycle velocity calculations in swimming. Journal of Science and Medicine in Sport, 12(2), 262-265. https://doi.org/10.1016/j.jsams.2007.11.008
Journal Article Type | Article |
---|---|
Publication Date | 2009-03 |
Deposit Date | Jan 26, 2009 |
Journal | Journal of Science and Medicine in Sport |
Print ISSN | 1440-2440 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 12 |
Issue | 2 |
Pages | 262-265 |
DOI | https://doi.org/10.1016/j.jsams.2007.11.008 |
Keywords | Biomechanics; Three-dimensional; Centre of mass; Hip; Freestyle; Accuracy; |
Public URL | http://researchrepository.napier.ac.uk/id/eprint/2472 |
Publisher URL | http://dx.doi.org/10.1016/j.jsams.2007.11.008 |
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