Post-Fatigue Vibration: Impact on Grip and Reaction Time

Bitlis Eren University42 enrolled

Overview

This study aims to investigate the acute effects of local vibration applied after induced fatigue of the wrist flexor muscles on grip strength and upper extremity reaction time.

This randomized controlled study will be conducted with a minimum of 42 participants who meet the inclusion and exclusion criteria. Participants will be randomly assigned to one of three groups: control, 50 Hz local vibration, or 100 Hz local vibration.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Muscle Fatigue

Interventions

100 Hz Local VibrationOTHER

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

50 Hz Local VibrationOTHER

Participants in this group will receive 50 Hz local vibration along the flexor carpi ulnaris muscle for a duration of 10 minutes.

Sham Local VibrationOTHER

Participants in this group will receive sham vibration following the muscle fatigue protocol. The vibration device will be turned on but held near the muscle without making contact for 10 minutes. Participants will be informed that they are being treated with an electromagnetic vibration device.

Eligibility

Sex: FEMALEMin age: 18 YearsMax age: 25 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1\. Female individuals aged 18-25 Exclusion Criteria: 1. Having an open wound in the area where local vibration is applied 2. A history of previous or current upper extremity injury 3. Use of anti-inflammatory drugs 4. Having a diagnosis of epilepsy

Locations (1)

Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Bitlis Eren University

Bitlis, Turkey (Türkiye)

Outcomes

Primary Outcomes

Hand Grip Strength Measurement

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.

Time frame: Change in hand grip strength from baseline following intervention or rest

Upper Extremity Reaction Time Measurement

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.

Time frame: Change in upper extremity reaction time from baseline following following intervention or rest

Data from ClinicalTrials.gov

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