Abstract
Swimmers take great advantage by reducing the drag forces either in passive or active conditions. The purpose of this work is to determine the frontal area of swimmers by means of an automated vision system. The proposed algorithm is automated and also allows to determine lateral pose of the swimmer for training purposes. In this way, a step towards the determination of the instantaneous active drag is reached that could be obtained by correlating the effective frontal area of the swimmer to the velocity. This article shows a novel algorithm for estimating the frontal and lateral area in comparison with other models. The computing time allows to obtain a reasonable online representation of the results. The development of an automated method to obtain the frontal surface area during swimming increases the knowledge of the temporal fluctuation of the frontal surface area in swimming. It would allow the best monitoring of a swimmer in their swimming training sessions. Further works will present the complete device, which allows to track the swimmer while acquiring the images and a more realistic model of conventional active drag ones.
Highlights
Swimming performance is affected by both the propulsive and resistive forces [1].Regarding the hydrodynamic drag, this force can be defined as an external force that acts in the swimmer’s body parallel but in the opposite direction of his movement [2,3]
We propose a viwhich are influenced by the swimmer’s velocity, boundary layer, shape, size, and the sion-based System for Automated Estimation of the frontal surface area of swimmers, and frontal surface while controversial issues exist due to the for difficulty of accurately these area instant[28], measurements could allow adapting the technical characteristics swiminto the session to improve the swimming performance reducing the passive drag
Our measure and frontal surface area measures obtained at key events during the stroke cycle results showed the different time evolution ofsurface the frontal and with the of front crawl swimming; the frontal area was area, obtained at a the very difference low samplingetfrequency
Summary
Swimming performance is affected by both the propulsive and resistive forces [1].Regarding the hydrodynamic drag, this force can be defined as an external force that acts in the swimmer’s body parallel but in the opposite direction of his movement [2,3]. Where m is the swimmer’s mass, a is the acceleration of the swimmer, and FP and FR are the total propulsive and resistive forces, respectively. According to Equation (1), when the magnitude of the propulsive and the resistive force are equal, a swimmer would maintain a constant speed. Swimmers should have an ability to both produce large propulsive force and to reduce resistive forces for the purpose of improving performance. Quantifying these forces when swimming is very beneficial in improving our understanding about swimming technique and improving swimming performance. Expert swimmers present higher propulsive forces than less expert swimmers but do not show higher drag values, obtaining higher swimming speed and performance [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
