Cross-training Effect of Whole-body Vibration

Not Applicable

Completed

• Conditions: Muscle Physiology
• Interventions: Device: Sham vibration; Device: Whole body vibration

• Registration Number: NCT03750799
• Lead Sponsor: Istanbul Physical Medicine Rehabilitation Training and Research Hospital

Brief Summary

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

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.

Study Timeline

• Study Start: 2018-11-12
• Study First Submitted: 2018-11-18
• Study First Submitted QC: 2018-11-20
• Study First Posted: 2018-11-23
• Primary Completion: 2019-01-01
• Study Completion: 2019-02-01
• Status Verified: 2019-04
• Last Update Submitted: 2019-04-16
• Last Update Posted: 2019-04-18

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 40

Inclusion Criteria

• Men with ages between 20-50 years
• Being healthy
• Being volunteer
• Right-sided dominant

Exclusion Criteria

• Non-cooperative subject

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Sham group	Sham vibration	Unlike the experimental group, sham vibration was applied to the control group.
Experimental group	Whole body vibration	Whole body vibration was applied on the right lower extremity.

Primary Outcome Measures

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

Trial Locations

Locations (1)

Istanbul Physical Medicine Rehabilitation Training and Research Hospital; 🇹🇷 Istanbul, Turkey