Effects of 6-Week Vibration and Non-Vibration Foam Rolling

Participants' knee flexor and extensor muscle strength will be evaluated with the Lafayette manual muscle test device (Lafayette Instrument Company, Lafayette IN, USA).This device is a valid and reliable method that is frequently used in the evaluation of muscle strength.

During the evaluation, participants will be asked to perform a maximum isometric contraction for 3 seconds with the muscle in which the muscle strength is evaluated against the resistance to be applied with the manual muscle test device. Measurements will be repeated 3 times with one minute intervals for the right and left sides and the average of the measured values will be used for analysis.

Participants' Hamstring/Quadriceps muscle strength ratio will be evaluated with the Lafayette manual muscle test device (Lafayette Instrument Company, Lafayette IN, USA). This device is a valid and reliable method that is frequently used in the evaluation of muscle strength. The Hamstring/Quadriceps muscle strength ratio will be determined by the ratio of the knee flexor and extensor muscle strengths obtained during the measurements.

The flexibility will be evaluated whit the sit-and-reach test. The testing box will be fixed to the wall, and participants will be requested to sit with their knees extended and the soles of their feet against the testing box. Then participants will be requested to slowly reach forward as far as possible along the top of the box and hold the position for 2 seconds without bending their knees. The average of the two trials will be used for analysis.

Dynamic balance will be evaluated with the Y balance test. The test is a valid and reliable method that was developed as a version of the Star Excursion Balance Test (SEBT) to improve repeatability and standardize the performance. During the preparation of the test, three tape measures; between the anterior and the posterolateral/posteromedial directions, will be fixed to the ground with 135° angles. The measurement will be done for the dominant side three times after the trial and the average of the endpoints where the athletes could reach will be used for analysis. The greater the distance the participants can reach during the test, the better participant's dynamic balance performance.

Agility will be evaluated with the agility T-test. The test is a valid and reliable method used in the assessment of agility performance. For this test, an agility circuit will be created with 4 cones named 1, 2, 3, and 4. Cones will also set up at a distance of 10 yards between 1 and 2, and 5 yards between 2, and 3, 2, and 4. At the "go" command, the participant will sprint forward from cone 1 to cone 2, sidestepped to cone 3, sidestepped to cone 4, sidestepped to cone 2, then backpedal as fast as possible to cone 1. A stopwatch will be used during the test. The test will be performed 2 times with at least 2-minute rest periods between trials. The average of the 2 trials will be used for data analysis.

Sprint performance will be evaluated with the 20-m sprint test. The test is a valid and reliable method used in studies to evaluate sprint performance. During the test, at the "go" command, the participant will be asked to complete the 20-meter distance as quickly as possible, and a stopwatch will be used to determine the time to complete the test. All participants will performed the test 2 times with at least 2-minute rest periods between trials. The average of the 2 trials will be used for data analysis.

Lower-extremity V-MRT will be evaluated with the Test You Brain Pro System. This system is a method that consists of 6 semaphores (sensors), 6 stabilizers, 1 charging cable, and 1 tablet and assesses and trains the reaction time of individuals in many different environments. Before the assessments, 6 semaphores (light and sound stimuli) will be positioned to form a 180° semicircle, with each semaphore placed in increments of 45° around the semicircle.Participants will perform the test three times with 30-second intervals after one trial with their right lower-extremity, left lower-extremity, and right and left lower-extremities (random), respectively. The average of the scores obtained will be recorded and used for analysis.

Anaerobic power test will be evaluated with the electromagnetic ergometer (Ergomedic894E, Germany). The measurement method is to adjust and set the saddle height so that the knee of each participant could have a flexion of about 5°, and thus, 0.075 kp per unit weight will be supposed to be applied when reaching one's maximum speed. Afterward, a tester in synchronization with the computer verbally count a 5-second count down following warm-up and then verbally will give a "Start" signal, after which peak anaerobic power, average power, and fatigue index will be measured while encouraging participants to perform the exercise as much as possible for 30 seconds.