In this group, sham vibration will be administered following the muscle fatigue protocol. The vibration device will be activated but positioned close to the muscle without direct contact for a duration of 10 minutes. Participants will be told that they are receiving treatment with an electromagnetic vibration device.

Participants in this group will receive 50 Hz local vibration following the muscle fatigue protocol. The local vibration will be applied along the flexor carpi ulnaris muscle for a duration of 10 minutes.

Participants in this group will receive 100 Hz local vibration following the muscle fatigue protocol. The local vibration will be applied along the flexor carpi ulnaris muscle for a duration of 10 minutes.

Participants in this group will receive 100 Hz local vibration along the flexor carpi ulnaris muscle for a duration of 10 minutes.

Grip strength will be assessed using a JAMAR® hydraulic hand dynamometer, which has five grip positions. The test will follow American Society of Hand Therapists guidelines, with the elbow at 90° flexion.

Measurements will be taken on the dominant hand. Participants will sit with their head facing forward, shoulders slightly abducted (10-20°), elbows at 90°, and wrists and hands in a neutral position. Both upper extremities will remain relaxed, and feet will be flat on the floor.

Fingers will be fully extended and adducted. Participants will be instructed not to allow their hands or forearms to touch the body. The dynamometer will be adjusted to fit the participant's hand size, typically set at the second handle position.

Upper extremity reaction times will be recorded using the BlazePod system (Play Coyotta Ltd., Tel Aviv, Israel). Participants will begin the reaction time test while seated, with both hands placed on a table, palms facing downward, and elbows flexed at 90°, with hands positioned 40 cm apart.

The BlazePod unit will be placed centrally, approximately 20 cm away from each hand. When the BlazePod lights up, participants will be instructed to respond as quickly as possible by tapping the light to turn it off. As the lights will activate randomly, participants will be required to react unpredictably and respond accordingly each time the light appears.

The total test duration will be recorded at the end of the trial.

To evaluate the effects of local vibration on fatigue perception and relief sensation, participants will be asked to rate the intensity of these two parameters on a scale from 0 to 10 before and after the application. A score of 0 indicates the lowest intensity, while a score of 10 represents an unbearable level.