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Completed

NCT Number: NCT06949566

Post-Fatigue Vibration: Impact on Grip and Reaction Time

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.

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Key information

Conditions

Muscle Fatigue

Age range

18 year–25 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

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

Bitlis, 13100, Turkey (Türkiye)

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Female individuals aged 18-25

Exclusion criteria

  • Having an open wound in the area where local vibration is applied
  • A history of previous or current upper extremity injury
  • Use of anti-inflammatory drugs
  • Having a diagnosis of epilepsy

Treatment and study plan

100 Hz Local Vibration

Other

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 Vibration

Other

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

Sham Local Vibration

Other

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.

Primary outcomes

  1. 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.

  2. 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.

Other outcomes

  1. 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.

  2. 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.

Sponsors and collaborators

Lead sponsor

Bitlis Eren University

Other

Registry information

Official study title

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

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Apr 29, 2025
Registry last updated
Jul 11, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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