Effects of fatigue on kinetic and kinematic variables during a 60-second repeated jumps test

International Journal of Sports Physiology and Performance
Jeni R McNealMichael H Stone

Abstract

The aim of this study was to investigate the effects of a maximal repeated-jumps task on force production, muscle activation and kinematics, and to determine if changes in performance were dependent on gender. Eleven male and nine female athletes performed continuous countermovement jumps for 60 s on a force platform while muscle activation was assessed using surface electromyography. Performances were videotaped and digitized (60 Hz). Data were averaged across three jumps in 10-s intervals from the initial jump to the final 10 s of the test. No interaction between time and gender was evident for any variable; therefore, all results represent data collapsed across gender. Preactivation magnitude decreased across time periods for anterior tibialis (AT, P < .001), gastrocnemius (GAS, P < .001) and biceps femoris (BF, P = .03), but not for vastus lateralis (VL, P = .16). Muscle activation during ground contact did not change across time for BF; however, VL, G, and AT showed significant reductions (all P < .001). Peak force was reduced at 40 s compared with the initial jumps, and continued to be reduced at 50 and 60 s (all P < .05). The time from peak force to takeoff was greater at 50 and 60 s compared with the initial jumps (P < ...Continue Reading

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Citations

Nov 20, 2013·Sports Biomechanics·Juliano Dal PupoSaray Giovana dos Santos
Nov 10, 2018·Sports Biomechanics·Danguole SatkunskieneAlbertas Skurvydas
Oct 2, 2015·BMC Musculoskeletal Disorders·Benjamin K WeeksSean A Horan
Oct 13, 2012·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Amir Abbas Zadpoor, Ali Asadi Nikooyan
Dec 21, 2012·Journal of Strength and Conditioning Research·David R HooperWilliam J Kraemer
Aug 21, 2018·Journal of Strength and Conditioning Research·Paige E RiceJeffrey M McBride
Sep 16, 2015·Scandinavian Journal of Medicine & Science in Sports·M LesinskiU Granacher

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