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Updated: Aug 6, 2026
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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
Published on: May 1, 2018
Altered Hamstring Mechanics and Strength Deficits Impair Balance Control in Athletes Following Hamstring Strain
Amornthep Jankaew1,2, Cheng-Feng Lin1,3
1Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
Journal of Applied Biomechanics
|July 25, 2026
Summary
Athletes with hamstring injuries show poorer balance control due to altered hamstring muscle function, including increased stiffness and reduced strength. This impacts their ability to perform daily activities and requires consideration in rehabilitation programs.
Area of Science:
- Biomechanics
- Sports Medicine
- Neuromuscular Control
Background:
- Hamstring strains significantly alter muscle function, but their precise impact on balance control is not well-established.
- Understanding these functional changes is crucial for effective rehabilitation and injury prevention in athletes.
Purpose of the Study:
- To investigate the effect of altered hamstring muscle function on balance control in athletes with hamstring injuries.
- To identify specific relationships between hamstring properties, strength, and balance performance.
Main Methods:
- Thirty-two athletes (16 with hamstring injuries, 16 controls) were assessed for hamstring properties and strength.
- Balance was evaluated using a forward lean task on a force platform under various sensory conditions (eyes open/closed, single/double leg stance).
- Center of pressure (CoP) parameters, including sway range, velocity, and area, were analyzed.
Main Results:
- Injured athletes demonstrated increased hamstring stiffness and decrement, alongside reduced hamstring strength.
- Impaired balance control was observed in injured athletes, evidenced by greater CoP sway range (anteroposterior and mediolateral), increased CoP velocity, and larger sway area, particularly under eyes-closed conditions.
- Significant correlations were found between hamstring function metrics and balance control parameters.
Conclusions:
- Altered hamstring function following injury significantly contributes to impaired balance control in athletes.
- These findings underscore the importance of addressing hamstring muscle function deficits during the rehabilitation of hamstring injuries to optimize recovery and prevent re-injury.
