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Does fatigue induced by repeated dynamic efforts affect hamstring muscle function?

G J Pinniger1, J R Steele, H Groeller

  • 1Department of Biomedical Science, University of Wollongong, NSW, Australia.

Medicine and Science in Sports and Exercise
|March 24, 2000
PubMed
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Hamstring fatigue alters sprint mechanics by reducing joint flexion and angular velocity, leading to protective changes in muscle activation to minimize hamstring strain during running.

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Understanding muscle fatigue is crucial for optimizing athletic performance and injury prevention.
  • Hamstring muscle function is vital for sprint running, but fatigue effects are not fully understood.

Purpose of the Study:

  • To investigate the impact of induced hamstring fatigue on sprint running kinematics and muscle activity.
  • To identify compensatory strategies employed by the body during fatigued sprinting.

Main Methods:

  • Subjects performed maximal sprints before and after specific hamstring fatigue protocols.
  • High-speed film analysis captured sprint kinematics.
  • Electromyography (EMG) recorded lower extremity muscle activity.

Related Experiment Videos

Main Results:

  • Fatigue led to decreased hip and knee flexion and reduced leg angular velocity.
  • Trunk, thigh, and leg segments showed altered angular displacement.
  • Increased hamstring muscle activation duration and earlier rectus femoris cessation were observed.

Conclusions:

  • Changes in sprint mechanics and muscle activation serve as protective mechanisms against hamstring strain.
  • These adaptations aim to reduce stress on the hamstring muscles during critical stride phases.