Background: Flexibility is an important factor in athletic performance, injury prevention, and functional movement. The Muscle Energy Technique (MET) and the Hamstring Nordic Lower exercise are commonly used interventions to improve hamstring flexibility. However, limited research has compared their effects, particularly using the YMCA Sit and Reach Box test.
Objective: This study aimed to compare the effects of the Muscle Energy Technique (MET) and the Hamstring Nordic Lower exercise on hamstring flexibility, as assessed by the YMCA Sit and Reach Box test.
Methods: Sixty athletes with hamstring tightness participated in a triple-blinded randomized clinical trial with a crossover study design. Participants were randomly assigned to three groups: MET group (including Post-Isometric Relaxation and Post-Facilitation Stretch), Hamstring Nordic Lower group, or control group. Each group received their respective intervention for one month, with daily sessions in 3 phases. Pre- and post-intervention measurements of hamstring flexibility were obtained using the YMCA Sit and Reach Box test. Secondary outcomes included perceived discomfort and participant satisfaction.2 way ANOVA test was applied in SPSS version 29
Results: Demographic characteristics were similar among the three groups. The effects of the interventions on hamstring flexibility, perceived discomfort, and participant satisfaction are currently being analyzed, and the results showed PFS group in all 3 phases shows highest improvement, followed by PIR , and least improvement was shown by HNL group in three groups with 3 phases.
Conclusion: This study employed a triple-blinded randomized clinical trial with a crossover study design to compare the effects of the Muscle Energy Technique (MET) and the Hamstring Nordic Lower exercise on hamstring flexibility. PFS techniques suggested to be the best exercise for prevention of eccentric tightness induced muscle injuries and performance complications. Followed by PIR and least improvement showed by HNL.t The findings contribute to the existing knowledge on optimizing hamstring flexibility and may have practical implications for sports medicine professionals, physical therapists, and strength and conditioning specialists..