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Related Experiment Video

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

Published on: May 1, 2018

Angle-specific eccentric hamstring fatigue after simulated soccer.

Daniel D Cohen¹, Bingnan Zhao, Brian Okwera

¹Masira Institute, Faculty of Life Sciences, Universidad de Santander (UDES), Bucaramanga, Colombia.

International Journal of Sports Physiology and Performance

|September 10, 2014

Summary

This summary is machine-generated.

Simulated soccer play significantly reduces hamstring eccentric strength and alters muscle balance, potentially increasing hamstring injury risk. Screening should assess eccentric strength and fatigue resistance to mitigate this risk.

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Area of Science:

Sports Medicine
Biomechanics
Exercise Physiology

Background:

Soccer involves intense, intermittent activity.
Hamstring injuries are common in soccer players.
Eccentric hamstring strength is crucial for injury prevention.

Purpose of the Study:

To assess the impact of simulated soccer on hamstring eccentric torque-angle profiles.
To evaluate changes in the angle of peak torque (APTeccH) for hamstrings.
To examine the hamstrings:quadriceps torque ratio at specific joint angles (ASHecc:Qcon).

Main Methods:

Nine semiprofessional male soccer players performed isokinetic knee flexion/extension tests.
Measurements were taken before and after the Loughborough Intermittent Shuttle Test (LIST).
Testing included concentric and eccentric knee flexion and concentric knee extension at 120°/s.

Main Results:

The LIST significantly decreased eccentric hamstring torque at multiple joint angles.
A significant reduction (21.8%) in ASHecc:Qcon was observed at 10°.
Eccentric hamstring peak torque declined significantly post-LIST, while concentric torques remained unchanged.

Conclusions:

Simulated soccer selectively impairs eccentric hamstring torque and muscle balance at extended positions.
These changes may elevate the risk of hamstring injuries.
Injury screening should include eccentric hamstring assessment, and training should focus on fatigue resistance and long-length eccentric strength.