Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2006) 05, 304 - 317

Research article
The Effects of Racket Inertia Tensor on Elbow Loadings and Racket Behavior for Central and Eccentric Impacts
Steven M. Nesbit , Michael Elzinga, Catherine Herchenroder, Monika Serrano
Author Information
Department of Mechanical Engineering, Lafayette College, Easton, PA, USA

Steven M. Nesbit
‚úČ Department of Mechanical Engineering, Lafayette College Easton, PA, USA.
Email: nesbits@lafayette.edu
Publish Date
Received: 08-09-2005
Accepted: 12-05-2006
Published (online): 01-06-2006
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ABSTRACT

This paper discusses the inertia tensors of tennis rackets and their influence on the elbow swing torques in a forehand motion, the loadings transmitted to the elbow from central and eccentric impacts, and the racket acceleration responses from central and eccentric impacts. Inertia tensors of various rackets with similar mass and mass center location were determined by an inertia pendulum and were found to vary considerably in all three orthogonal directions. Tennis swing mechanics and impact analyses were performed using a computer model comprised of a full-body model of a human, a parametric model of the racket, and an impact function. The swing mechanics analysis of a forehand motion determined that inertia values had a moderate linear effect on the pronation-supination elbow torques required to twist the racket, and a minor effect on the flexion-extension and valgus-varus torques. The impact analysis found that mass center inertia values had a considerable effect on the transmitted torques for both longitudinal and latitudinal eccentric impacts and significantly affected all elbow torque components. Racket acceleration responses to central and eccentric impacts were measured experimentally and found to be notably sensitive to impact location and mass center inertia values.

Key words: Biomechanical models, tennis swing, forehand, elbow loads, impact behavior


           Key Points
  • Tennis biomechanics.
  • Racket inertia tensor.
  • Impact analysis.
  • Full-body computer model.
 
 
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