Muscle Vibration and Joint Position Sense

Study Overview
=================
Brief Summary
-----------------
The present study aimed to investigate and compare the acute effect of local vibration (63 Hz vs 42 Hz frequencies) on the biceps brachii muscles on the elbow joint position sense (JPS) in healthy young men. Forty-five healthy young men aged 19 to 30 years were enrolled in the study. The participants were randomly assigned to receive either 63 Hz (n=15) or 42 Hz (n=15) or sham vibration (control group) (n=15). Participants in the experimental group received five bouts of 1-minute of each vibration exposure localized to the biceps brachii muscle, with a 1-minute rest between the bouts. Active elbow joint position error (in degrees) was selected as an outcome measure to assess elbow JPS. To measure active elbow joint position error, the subject was made to sit on the chair with eyes closed and shoulders in 0 degree of abduction and elbows fully extended. The examiner passively moved the elbow to 90 degrees of flexion (target position) and maintained it for 10 seconds. The subject was requested to memorize the target position. The subject was asked to actively flex the elbow to the target position from the initial starting position (elbow fully extended) and hold it for 5 seconds. Three trials were conducted, with a 30-second rest given between each trial. The target and reproduced angles in each trial were measured using a standard plastic goniometer. The difference between the target and reproduced angles in each trial was calculated to determine active elbow joint position error. Measurements were taken at baseline and immediately after the vibration protocol.

Official Title
-----------------
Acute Effects of Muscle Vibration on the Elbow Joint Position Sense in Healthy Young Men

Conditions
-----------------
Vibration; Exposure

Intervention / Treatment
-----------------
* Other: 63 Hz Vibration
* Other: 42 Hz Vibration
* Other: Sham vibration


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Healthy young men Exclusion Criteria: history of recent upper extremity surgery history of sensory deficits in the upper extremity recent upper extremity injury undergoing any resistance training

Ages Eligible for Study
-----------------
Minimum Age: 19 Years
Maximum Age: 30 Years

Sexes Eligible for Study
-----------------
Male

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 63 Hz vibration group<br>Vibration of 63 Hz frequency was applied. | Other: 63 Hz Vibration<br>* Vibrations of 63 Hz were applied with handheld vibration device.<br>|
| Active Comparator: 42 Hz vibration group<br>Vibration of 42 Hz frequency was applied. | Other: 42 Hz Vibration<br>* Vibrations of 42 Hz were applied with handheld vibration device.<br>|
| Sham Comparator: Sham vibration group<br>No actual vibration was applied. | Other: Sham vibration<br>* Handheld device was applied to the participants without any vibrations.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Active elbow joint position error | Participants were asked to actively reproduce a target position of the elbow joint. | 1 day | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Muscle vibration, joint position sense, proprioception, elbow, rehabilitation