Comparison of a Low Load Eccentric Training Protocol and a Static Stretching Protocol on Hamstring Muscle...

Area of Science:

• Sports Medicine
• Rehabilitation Science
• Biomechanics

Background:

• Hamstring flexibility is crucial for athletic performance and injury prevention.
• Limited research compares eccentric strengthening to static stretching for hamstring flexibility.

Purpose of the Study:

• To compare the efficacy of eccentric strengthening (Nordic Hamstring Exercise) versus static stretching in improving hamstring flexibility.
• To assess changes in hamstring flexibility over a six-week period.

Main Methods:

• 44 asymptomatic participants with hamstring tightness were randomized into three groups: Nordic Hamstring Exercise (NHE), static stretching, or control.
• Hamstring flexibility was measured using the passive knee extension (PKE) test at baseline, 3 weeks, and 6 weeks.
• A mixed model ANOVA was used to analyze between and within-group differences.

Main Results:

• A significant time × group interaction was observed (p < 0.05).
• Both the static stretching and NHE groups demonstrated significantly greater improvements in hamstring flexibility compared to the control group at six weeks (p < 0.001).
• The NHE group achieved similar flexibility increases to the static stretching group.

Conclusions:

• Eccentric training, specifically the NHE, is effective in increasing hamstring muscle length.
• Both static stretching and eccentric training are viable methods for addressing hamstring flexibility deficits.
• This study supports the use of either approach to enhance hamstring flexibility.