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String vibration dampers do not reduce racket frame vibration transfer to the forearm.

F X Li1, D Fewtrell, M Jenkins

  • 1Perception-Action Laboratory, School of Sport and Exercise Sciences, University of Birmingham, UK. f.x.li@bham.ac.uk

Journal of Sports Sciences
|April 2, 2005
PubMed
Summary

Tennis string dampers do not significantly reduce racket frame vibration transferred to the forearm. These devices offer acoustic and psychological benefits rather than mechanical advantages for players.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Materials Science

Background:

  • Racket sports involve significant vibration transfer to the player's arm.
  • String vibration damping devices are commonly used by players.
  • The mechanical efficacy of these dampers in reducing vibration is debated.

Purpose of the Study:

  • To investigate the effectiveness of string vibration damping devices in reducing racket frame vibration transmitted to the forearm.
  • To analyze vibration amplitudes at the wrist and elbow under different damping conditions and impact locations.

Main Methods:

  • Twenty participants performed forehand and backhand strokes with tennis balls impacting at vibration nodes and dead spots.
  • Vibration transfer was measured with and without string dampers.

Related Experiment Videos

  • A three-way repeated measures analysis of variance was used to analyze the data.

    • Main Results:

    • String dampers did not significantly alter vibration amplitude at the resonant frequency (approx. 120 Hz) in the wrist or elbow.
    • Impacts on the 'dead spot' generated greater vibration amplitudes compared to impacts at the vibration node.
    • No significant interaction was found between impact location and the use of string dampers.

    Conclusions:

    • String dampers do not provide a mechanical advantage by reducing racket frame vibration transfer to the forearm.
    • The popularity of string dampers may stem from their acoustic properties and psychological effects on players.
    • Further research could explore alternative vibration mitigation strategies in racket sports.