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Related Experiment Video

Updated: Jul 16, 2026

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

Effect of hamstring-emphasized resistance training on hamstring:quadriceps strength ratios.

William R Holcomb¹, Mack D Rubley, Heather J Lee

¹Sports Injury Research Center, Department of Kinesiology, University of Nevada, Las Vegas 89154, USA. wholcomb@unlv.nevada.edu

Journal of Strength and Conditioning Research

|February 23, 2007

Summary

A six-week hamstring-focused strength program significantly improved the functional hamstring:quadriceps (H:Q) ratio in female soccer players. This enhanced ratio is crucial for preventing anterior cruciate ligament (ACL) injuries.

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Published on: January 29, 2016

Area of Science:

Sports Medicine
Biomechanics
Exercise Physiology

Background:

A low hamstring to quadriceps (H:Q) strength ratio is linked to increased risk of hamstring and anterior cruciate ligament (ACL) injuries.
Assessing H:Q ratios is vital for injury prevention strategies in athletes.

Purpose of the Study:

To evaluate the H:Q ratios in female collegiate soccer players.
To determine the effect of a 6-week strength training program on H:Q ratios.

Main Methods:

12 female NCAA soccer players underwent pre- and post-training assessments.
Isokinetic dynamometry measured peak torque of hamstrings and quadriceps during concentric and eccentric actions at various speeds.
Both conventional (concentric:concentric) and functional (eccentric:concentric) H:Q ratios were analyzed.

Main Results:

A significant increase in the functional H:Q ratio was observed after the 6-week training program (0.96 to 1.08).
The conventional H:Q ratio did not show a significant change.
The post-training functional H:Q ratio exceeded 1.0, a threshold associated with ACL injury prevention.

Conclusions:

Six weeks of strength training emphasizing hamstrings can significantly improve the functional H:Q ratio.
The improved functional H:Q ratio suggests a potential reduction in ACL injury risk for female soccer players.
The functional H:Q ratio is a more sensitive indicator of training adaptations than the conventional ratio.