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Related Experiment Video

Updated: Jan 20, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Eccentric-concentric Ratio: A Key Factor for Defining Strength Training in Soccer.

F Javier Nuñez1, Moisés de Hoyo2, Alejandro Muñoz López3

  • 1Physical Performance & Sports Research, University of Pablo de Olavide, Seville, Spain.

International Journal of Sports Medicine
|August 22, 2019
PubMed
Summary

This study found that functional strength training significantly improved eccentric power and the eccentric/concentric power ratio in young elite soccer players. Analyzing both power phases and their ratio is key for optimizing training with inertial devices.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Elite youth soccer performance relies on explosive power and speed.
  • Traditional strength training may not fully optimize all aspects of power production.
  • Inertial devices offer unique training stimuli for power development.

Purpose of the Study:

  • To investigate the effects of a 9-week functional strength training program on concentric power (CON), eccentric power (ECC), ECC/CON ratio, and linear sprint performance in elite young soccer players.
  • To compare the outcomes between a training group (CPG) and a control group (CG).

Main Methods:

  • Twenty elite young soccer players were divided into a control group (CG) and a training group (CPG).
  • The CPG performed a specific front-step exercise with a conical pulley (2-3 sets, 6 reps/leg) for 9 weeks, in addition to their usual training.
  • Measurements included concentric mean power, eccentric mean power, ECC/CON ratio, and 10m and 10-20m sprint times.

Main Results:

  • The CPG showed significantly greater improvements in eccentric mean power (36%) and the ECC/CON ratio (17%) compared to the CG.
  • The CG demonstrated a substantial increase in concentric mean power (16%) compared to the CPG.
  • Sprint performance showed enhancements in both groups, with the CPG improving 10m sprint time (2.8%) and the CG improving 10-20m flying time (1.72%).

Conclusions:

  • Functional strength training using inertial devices can effectively enhance eccentric power and the ECC/CON ratio in young elite soccer players.
  • Measuring both concentric and eccentric power phases, along with their ratio, is crucial for evaluating training effectiveness with inertial devices.
  • This approach aids in defining optimal functional strength training strategies for performance enhancement in soccer.