Development of Immediate Feedback Software for Optimising Glide Performance and Time of Initiating Post-Glide Actions (P56)

  • Roozbeh Naemi
  • Serdar Aritan
  • Simon Goodwill
  • Steve Haake
  • Ross Sanders
Conference paper

Abstract

Performance in starts and turns is a major contributor to success in swimming and is influenced greatly by the glide efficiency and the timing of commencing the post-glide action (including kick in all strokes and the underwater pull in breaststroke starts and turns). The main aim of this research is to develop and test ‘user friendly’ software for providing immediate feedback to swimmers and coaches to optimise glide performance and time of initiating post-glide actions in starts, turns, and the glide phase of the breaststroke.

The developed software reads the video file of a glide followed by the post-glide action (PGA) gathered from a single underwater camera positioned perpendicular to the swimmer’s trajectory path. A set of body markers are digitised to provide the records of the displacement data. The mathematical model based on the ‘hydro-kinematic method’ (Naemi, 2007) is coded in MATLAB to calculate the glide efficiency parameters, reconstructed instantaneous velocity, and the actual and optimal times and distances of commencing post-glide action using the raw displacement. A Graphic User Interface with user friendly icon based system enables the results to appear in an aesthetic and effective screen display, which includes a video replay, displacement and velocity graphs, and tabulated results.

Early tests revealed that the effectiveness of the ‘Hydro-kinematic’ method in ‘fine-tuning’ performance can potentially be improved by the developed software that enables rapid turnaround of results. The accompanying video replay enables qualitative assessment of postures and orientations enabling refinement in subsequent trials. The information from the software is also particularly important in predicting the exact timing for initiating the post glide action for a particular swimmer with a distinct glide efficiency and post-glide performance.

Keywords

Glide PGA Timing Immediate feedback Glide Efficiency Streamlining 

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References

  1. [BN1]
    Bilo D. and Nachtigall W.. A simple method to determine drag coefficients in aquatic animals. In Journal of Experimental Biology, 87: 357–359, 1980Google Scholar
  2. [BB1]
    Benjanuvatra N., Blanksby B. A., and Elliott B.C. Morphology and hydrodynamic resistance in young swimmers. In Paediatric Exercise Science, 13(3): 246–255, 2001Google Scholar
  3. [CL1]
    Chatard J. C, Lavoie, J. M. Bourgoin B.,and Lacour J. R. The contribution of passive drag as a determinant of swimming performance. In International Journal of Sports Medicine, 11(5): 367–372, 1990CrossRefGoogle Scholar
  4. [HL1]
    Howe M.S., Lauchle G. C. and Wang J. Aerodynamic lift and drag fluctuations of a sphere. In Journal of Fluid Mechanics 436:41–57, 2001MATHGoogle Scholar
  5. [KD1]
    Klauck J. and Daniel K. Determination of man’s drag coefficient and effective propelling forces in swimming by means of chronocyclography. In Biomechanics VB, Intentional Ser. on Biomechanics. Vol. 1 B: 250–257, 1976Google Scholar
  6. [LB1]
    Lyttle A. D., Blanksby B. A., Elliott B. C, and Lloyd, D. G. Net forces during tethered simulation of underwater streamlined gliding and kicking techniques of the freestyle turn. In Journal of Sport Sciences, 18: 801–807, 2000.CrossRefGoogle Scholar
  7. [N1]
    R. Naemi. A Hydro-kinematic method for quantifying glide efficiency of swimmers. Doctoral Thesis, The University of Edinburgh, 2007.Google Scholar
  8. [NS1]
    R. Naemi and R.H. Sanders. A comparison of two functions representing velocity of a human body subject to passive drag. International Symposium on Biomechanics in Sports 2004, Proceedings of conference, 2004.Google Scholar
  9. [SB1]
    R.H. Sanders and J. Byatt-Smith. Improving feedback on swimming turns and starts exponentially. International Symposium on Biomechanics in Sports 2001, Proceedings of Swim Sessions, 2001.Google Scholar
  10. [W1]
    J.S. Walton. Close-range Cine-photogrammetry: A generalized techniques for quantifying gross human motion. Masters dissertation, Pennsylvania State University, 1981.Google Scholar
  11. [WL1]
    Wang J., Lauchle G. C, and Howe M. S. Flow-induced force fluctuations on a sphere at high Strouhal number. In Journal of Fluid and Structure. 17: 365–380, 2003CrossRefGoogle Scholar

Copyright information

© Springer-Verlag France, Paris 2009

Authors and Affiliations

  • Roozbeh Naemi
    • 1
  • Serdar Aritan
    • 2
  • Simon Goodwill
    • 3
  • Steve Haake
    • 3
  • Ross Sanders
    • 1
  1. 1.Centre for Aquatics Research and EducationThe University of EdinburghEdinburghUK
  2. 2.Biomechanics Research GroupSchool of Sports Sciences and Technology, BeytepeAnkaraTurkey
  3. 3.Sports Engineering @ Centre for Sport and Exercise ScienceSheffield Hallam UniversityCollegiate HallUK

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