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Dynamic Stabilization Time After Isokinetic and Functional Fatigue.

Erik A Wikstrom1, Michael E Powers, Mark D Tillman

  • 1University of Florida, Gainesville, FL.

Journal of Athletic Training
|October 22, 2004
PubMed
Summary
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Neither isokinetic nor functional fatigue protocols significantly impacted dynamic stability during jump landings. Both methods showed similar effects on time to stabilization and ground reaction forces.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Exercise Physiology

Background:

  • Dynamic stability during jump landings is crucial for injury prevention.
  • Fatigue can impair neuromuscular control and increase injury risk.
  • Understanding how different fatigue protocols affect landing mechanics is important for training and rehabilitation.

Purpose of the Study:

  • To compare the effects of isokinetic and functional fatigue protocols on dynamic stability during jump landings.
  • To analyze the impact of these fatigue protocols on time to stabilization (TTS), ground reaction force (GRF), and joint kinematics.

Main Methods:

  • Twenty healthy participants (8 males, 12 females) performed jump landings after undergoing two randomized fatigue protocols (isokinetic and functional).
  • Measurements included peak vertical GRF, TTS (vertical, medial-lateral, anterior-posterior), and joint kinematics (ankle dorsiflexion, knee-flexion, knee-valgum) using forceplates and 3D motion analysis.

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Main Results:

  • No significant differences were found in TTS, GRF, or joint kinematics between the isokinetic and functional fatigue protocols.
  • Both fatigue protocols similarly affected measures of dynamic stability after jump landings.

Conclusions:

  • Isokinetic and functional fatigue protocols do not differentially affect dynamic stability during jump landings.
  • These findings suggest that either protocol can be used to induce fatigue when studying its effects on landing mechanics.