The effects of eccentric training on hamstring flexibility and strength in young dance students

Area of Science:

• Sports Science
• Dance Medicine
• Rehabilitation

Background:

• Young dancers require optimal hamstring flexibility and strength for performance and injury prevention.
• Foundational dance training programs often lack specific interventions for hamstring development.
• Eccentric training is a promising modality for muscle strengthening and flexibility enhancement.

Purpose of the Study:

• To investigate the effects of eccentric training on hamstring flexibility and strength in young dancers.
• To compare the efficacy of eccentric training (Nordic hamstring exercise & single-leg deadlift) versus traditional stretching (forward bending & standing leg lift) in dancers.
• To determine if eccentric training provides superior benefits for hamstring adaptation in this population.

Main Methods:

• A 6-week intervention study involving 24 female dance students.
• Participants were divided into an eccentric training group (NHE&SLD), a traditional stretching group (FBE&SLL), and a control group.
• Isokinetic dynamometry and electronic goniometry were used to measure hamstring strength and flexibility, respectively.
• Paired t-tests and ANCOVA were employed for statistical analysis.

Main Results:

• The eccentric training group (NHE&SLD) showed significant improvements in both concentric and eccentric hamstring strength.
• Both the NHE&SLD and FBE&SLL groups demonstrated significant increases in hamstring flexibility (active straight leg raise angle).
• Pre-intervention strength measures significantly influenced post-intervention outcomes in both training groups.

Conclusions:

• Eccentric training (NHE&SLD) is highly effective in enhancing both hamstring strength and flexibility in young dancers.
• Traditional stretching (FBE&SLL) also improves hamstring flexibility but to a lesser extent than eccentric training for overall adaptation.
• Eccentric training offers greater training benefits compared to traditional stretching for optimizing hamstring function in dancers.