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Concentric versus enhanced eccentric hamstring strength training: clinical implications.

T W Kaminski1, C V Wabbersen, R M Murphy

  • 1University of Florida, Gainesville, FL 32611.

Journal of Athletic Training
|March 25, 2006
PubMed
Summary
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Eccentric hamstring strength training significantly improved muscle strength more than concentric training. This approach is highly effective for rehabilitation and should be considered for hamstring and knee injuries.

Area of Science:

  • Sports Medicine
  • Rehabilitation Science
  • Biomechanics

Background:

  • Hamstring injuries are common and can lead to chronic issues.
  • Rehabilitation traditionally focuses on concentric muscle actions.
  • Eccentric muscle actions are crucial for preventing muscle injury.

Purpose of the Study:

  • To compare hamstring muscle strength gains between concentric and eccentric training.
  • To evaluate the effectiveness of different training modalities on hamstring strength.

Main Methods:

  • Randomized-group design with three groups: eccentric training, concentric training, and control.
  • Subjects underwent 6 weeks of training (2 days/week) or served as controls.
  • Strength was measured using 1-repetition maximum (1 RM) and isokinetic dynamometry.

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Main Results:

  • The eccentric training group showed a 29% improvement in 1 RM, compared to 19% in the concentric group.
  • Only the eccentric group demonstrated significant improvements in eccentric isokinetic peak torque/body weight ratios.
  • Control subjects showed no significant strength changes.

Conclusions:

  • Isotonic strength training effectively enhances hamstring muscle strength.
  • Eccentric strength training yields superior results for both isotonic and isokinetic hamstring strength.
  • Clinicians should incorporate eccentric hamstring strengthening into rehabilitation protocols for hamstring and knee injuries.