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
from September 2014
©Journal of Sports Science and Medicine (2008) 07, 84 - 90

Research article
The Effects of Kinetic Energy on Concentric and Eccentric Isokinetic Work
Brian Boggess1, Jeff Moffit2, , Jacobo Morales3, Tim Anderson3
Author Information
1 California Department of Corrections Southern Testing Center, Rancho Cucamonga, CA, USA
2 California State University, Bakersfield, Bakersfield, CA, USA
3 California State University, Fresno, Fresno, CA, USA

Jeff Moffit
‚úČ Department of Physical Education and Kinesiology, California State University, Bakersfield, 9001 Stockdale Hwy, Bakersfield, CA 93311, USA
Publish Date
Received: 13-01-2007
Accepted: 27-11-2007
Published (online): 01-03-2008
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This investigation examined inertial effects on work output during isokinetic concentric knee extension and eccentric knee flexion. Total work (Wtotal) included work due to kinetic energy (Wkin), with respect to gravity (Wgrav), and against the dynamometer (Wdyn). Eighteen resistance-trained participants (9 males, 9 females) performed maximal voluntary concentric (90, 150, 210, 270 deg/s) and eccentric (-150, -90, -30 deg/s) actions with the dominant leg. Differences between work measurement type (WMT), i.e., gravity-corrected work and Wtotal, were assessed. ANOVA (2 WMT x 2 mode x 2 gender x 4 speed) revealed significant main effects (p < 0. 05) for both factors concentrically but only for WMT eccentrically. It was concluded that the effect of kinetic energy during isokinetic leg extension may elicit differences in measurement where the associated error (Kerr) significantly increases with increasing velocity concentrically and decreases eccentrically.

Key words: Kinetic energy, kinetic error, work measurement type

           Key Points
  • Total isokinetic work is underestimated by standard gravity corrected techniques.
  • Standard gravity corrected work measurements overestimate isometric eccentric total work.
  • The overestimation of isometric eccentric total work increases with greater angular velocity.
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