Effects of Foam Rolling on Hamstring Deep Fascia Stiffness, Pressure Pain Threshold, Flexibility and Active Jumping in Ameutre Athletes following Delayed Onset Muscle Soreness.

Determining the effect of foam rolling of the hamstring muscle on deep fascial tightness, pressure pain threshold, passive range of motion, and vertical jump in amateur athletes with delayed onset muscle soreness

A controlled, single-blind, randomized, parallel-group clinical trial on 24 amateur athletes. Random numbers written on paper will be used for randomization.

This study is conducted on amateur athletes. First, dams are created and then foam rolling is used to perform an intervention on the intervention group. Deep fascial tightness will be assessed before and after the interventions. Blinding in this study is such that the person evaluating the results is different from the person collecting the sample and has no knowledge of the groups.

Inclusion criteria: Healthy amateur athlete, 18 to 35 years old, both sexes, without neurological disorders. Exclusion criteria: Participant's withdrawal from cooperation. Participant's feeling of dissatisfaction.

The intervention group used foam rolling after performing Nordic exercises. They put their maximum body weight on the foam rolling and slid their body mass along it, starting from the proximal part of the back area at the hamstring muscle, then moving down and gradually moving them towards the knee, and when the foam rolling reached the distal thigh area, it was returned to the initial position. These steps were performed at a rotation speed of 30 rotations per minute and foam rolling was performed in 4 sets of 45 seconds, with a 15-second rest period between sets. In the sessions 24 and 48 hours after the initial Nordic exercises, the intervention group repeated the foam rolling steps. The control group did not receive foam rolling.

Deep fascial stiffness, pressure pain threshold, flexibility, and active jumping

The sampling method in this study will be available sampling. The samples will be randomly assigned to two groups using the Stratified Permuted Block Randomization method with 6 blocks of 4. In this method, A will represent group one (foam rolling group) and B will represent group two (control group). In this way, the order of interventions A and B in the form of blocks from number 1 to 6 will be determined by the project's methodological consultant and provided to the project's executive supervisor, and the researcher will obtain assignments from the executive supervisor to assign each eligible person. The executive supervisor first selects the block using a table of random numbers, and then the eligible people are assigned to one of the two groups A or B based on the order previously determined in the table.

The outcome assessor will be blinded to the treatment groups.