Post-Fatigue Vibration: Impact on Grip and Reaction Time

July 10, 2025 updated by: Omer Dursun, Bitlis Eren University

Evaluation of Grip Strength and Reaction Time Following Induced Fatigue of the Wrist Flexors: The Acute Effects of Local Vibration

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.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

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

Enrollment (Actual)

42

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Turkey
      • Bitlis, Turkey, 13100
        • Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Bitlis Eren University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

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

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Sham Comparator: Sham Vibration Group
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.
Other: Sham Local Vibration
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.
Experimental: 50 Hz Local Vibration Intervention Group
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.
Other: 50 Hz Local Vibration
Participants in this group will receive 50 Hz local vibration along the flexor carpi ulnaris muscle for a duration of 10 minutes.
Experimental: 100 Hz Local Vibration Intervention Group
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.
Other: 100 Hz Local Vibration
Participants in this group will receive 100 Hz local vibration along the flexor carpi ulnaris muscle for a duration of 10 minutes.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Hand Grip Strength Measurement
Time Frame: Change in hand grip strength from baseline following intervention or rest

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.
Change in hand grip strength from baseline following intervention or rest
Upper Extremity Reaction Time Measurement
Time Frame: Change in upper extremity reaction time from baseline following following intervention or rest

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.
Change in upper extremity reaction time from baseline following following intervention or rest

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Fatigue Perception and Relief Sensation After Vibration or Rest
Time Frame: Change in baseline fatigue perception and relief sensation following intervention or rest
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.
Change in baseline fatigue perception and relief sensation following intervention or rest
Post-Fatigue Fatigue Rating
Time Frame: Change in baseline fatigue following muscle exhaustion protocol
To evaluate the perception of fatigue emerging after the fatigue protocol, participants will be asked to rate the intensity of their fatigue on a scale from 0 to 10. A score of 0 indicates no fatigue, while a score of 10 represents an unbearable level of fatigue.
Change in baseline fatigue following muscle exhaustion protocol

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Bitlis Eren University

Investigators

  • Principal Investigator: ömer dursun, Asst. Prof., Bitlis Eren University
  • Principal Investigator: Merve Tunçdemir, Asst. Prof., Bitlis Eren University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 8, 2025

Primary Completion (Actual)

June 26, 2025

Study Completion (Actual)

June 26, 2025

Study Registration Dates

First Submitted

April 22, 2025

First Submitted That Met QC Criteria

April 22, 2025

First Posted (Actual)

April 29, 2025

Study Record Updates

Last Update Posted (Actual)

July 11, 2025

Last Update Submitted That Met QC Criteria

July 10, 2025

Last Verified

July 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BEUFTR-8

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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