Cross-training Effect of Whole-body Vibration

Study Overview
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Brief Summary
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This study evaluates whether an increase in the ipsilateral knee flexor muscle strength transfers to the contralateral knee extensors which are not exposed to vibration, when unilateral-isolated whole body vibration (WBV) is applied to the lower extremity. In the half of volunteers the right leg were exposed vibration, while in the other half the right leg were exposed sham vibration. Muscle strength were measured with the Cybex® (Massachusetts, USA) extremity-testing system.

Detailed Description
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This study was included 40 healthy volunteers. The change in the quadriceps muscle strength after 20 session of WBV exercises was evaluated this study. In the WBV group, 20 sessions of unilateral lower extremity vibration exercises were performed with the Whole Body Vibration (WBV) device. WBV was applied when the subjects are in the semi-squat position. WBV was implemented with Powerplate® Pro5 (PowerPlate® International Ltd, London, United Kingdom). During 20 sessions, the WBV amplitude and vibration time were increased gradually. In the first session, the subjects were do a 30-second, 30-35, 40- and 45-Hz low-amplitude WBV while the knee and hip joint were in 30 degrees of flexion (in the semi-squat position); 10-second rest period between vibration applications were applied. A total duration of WBV was be two minutes. In the 20th session, the subjects were given a 60-second, 30-, 35-, 40- and 45-Hz high-amplitude WBV while the knee and hip joint were in 45 degrees of flexion; 10-second rest period between vibration applications were applied. A total duration of WBV was eight minutes. During WBV, the left lower extremity was in the knee-hip flexion position but was not exposed the vibration. The same experimental protocol was applied to the isometric exercise (control) group. Unlike the experimental group, sham vibration was applied to the control group. Before and after 20 session-exercise, both knee extensor isokinetic muscle strength was measured.

Official Title
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Cross-training Effect of Whole-body Vibration

Conditions
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Muscle Physiology

Intervention / Treatment
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* Device: Whole body vibration
* Device: Sham vibration


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Men with ages between 20-50 years Being healthy Being volunteer Right-sided dominant Exclusion Criteria: Non-cooperative subject

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 50 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Experimental group was exposed WBV, Control group was exposed sham WBV
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental group<br>Whole body vibration was applied on the right lower extremity. | Device: Whole body vibration<br>* Whole body vibration was applied on the right lower extremity in the experimental group.<br>|
| Sham Comparator: Sham group<br>Unlike the experimental group, sham vibration was applied to the control group. | Device: Sham vibration<br>* Sham vibration was applied on the right lower extremity in the Control sham group<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Muscle strength gain of the untrained contralateral quadriceps muscle | Untrained contralateral quadriceps muscle strength was measured with the Cybex extremity-testing system before and after trial. Unit of this parameter was Nm | four months |