Sprint versus isolated eccentric training: Comparative effects on hamstring architecture and performance in soccer...

Area of Science:

• Sports Science
• Biomechanics
• Muscle Physiology

Background:

• Soccer players require optimal sprint performance and hamstring muscle health.
• Hamstring eccentric (NHE) training and sprint training are common methods to enhance performance.
• Understanding the specific effects of these training modalities on muscle architecture is crucial.

Purpose of the Study:

• To compare the effects of NHE strength training versus sprint training on sprint performance.
• To investigate the impact of these training methods on sprint mechanics.
• To examine changes in biceps femoris long head (BFlh) muscle architecture.

Main Methods:

• A prospective interventional control study over six weeks during preseason.
• Three groups of soccer players: Soccer (regular practice), Nordic (NHE training), and Sprint (sprint training).
• Measurements included sprint performance, mechanics, and BFlh architecture (fascicle length, pennation angle).

Main Results:

• Sprint training group showed significant improvements in sprint performance and mechanics.
• Sprint training led to a moderate increase in BFlh fascicle length.
• NHE training showed smaller increases in fascicle length and pennation angle, with minimal performance changes.

Conclusions:

• Sprint training is superior to NHE for enhancing BFlh fascicle length and sprint performance.
• Sprint training provides a preventive stimulus by increasing fascicle length while improving performance.
• Further research with advanced imaging is recommended to validate findings.