2.4. Interventions
CONTRACTION
After enrollment, the participants signed an informed consent form, and each participant was randomly assigned to one of the following two groups.The PNF group. A PNF stretching protocol was performed with each participant assuming a long sitting position on a plinth with their knees maintained as extended as possible. At this moment, the participant was asked to perform maximum isometric hamstring muscle contraction for 5 s followed by 5 s of relaxation and 20 s of stretching (The FR group. For the application of foam rolling, the subjects assumed a long sitting position on a firm and even surface by placing the arms backward and transferring their body weight to their palms. The foam roller, applied bilaterally, was placed under the hamstrings and slowly moved back and forth from the ischial tuberosity to the popliteal fossa by applying pressure for 2 min (