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Latency of Vibration-Induced Reflex Muscle Activity (LVIRMA)

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
Bagcilar Training and Research Hospital
ClinicalTrials.gov Identifier:
NCT01780376
First received: January 28, 2013
Last updated: June 17, 2014
Last verified: June 2014
  Purpose

Whole Body Vibration (WBV) applies thrust force in opposite direction to gravity to body.This mechanical stimulation induces reflex muscular activity. Tonic vibration reflex (TVR) is most commonly cited mechanism to explain WBV-induced reflex muscular activity (WBV-IRMA), although there is no conclusive evidence that TVR occurs. The bone myoregulation reflex is another neurologic mechanism used to explain the effects of vibration on muscular performance.

Investigators hypothesized that latency of WBV-IRMA is different from latency of TVR. Primary aim of this study is to determine latency of WBV-IRMA. Secondary aim is to investigate whether WBV-IRMA is explained with TVR.

Twenty healthy young adult men are planned to include in this study. Participants will stand upright with their knees locked during WBV. PowerPlate Pro5 will be used for WBV. WBV with high amplitude at 25,30,35,40,45 and 50 Hz will be applied. Surface electrodes will be placed on both the soleus muscles. To measure TVR latency, piezo-electric accelerometer will be placed on the achilles tendon and this achilles tendon will be stimulated with spring based mechanical reflex hammer. Our pilot study was showed that motor unit potentials (MUAP) occurred in a 1:1 response with vibration. After confirmation of this finding, WBV-IRMA latency will be measured in the present study. To measure WBV-IRMA latency, piezo-electric force sensor will be placed between heel and WBV platform. Exact moment of initial strike of heel when thrust force expressed by WBV begin to be transferred to body will be determined. The time between moment of the initial strike and corresponding MUAP is defined as "WBV-IRMA latency". Piezo-electric stretch sensor will be placed between knee and malleol to simulate muscle spindle. The reflex muscle activity of soleus muscles will be measured by PowerLab (data acquisition system, ADInstruments, Australia) device.

This project is planed to be completed in 1 months.


Condition Intervention
Effects of Vibration
Procedure: whole-body vibration (WBV)

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
Official Title: Latency of Whole-Body Vibration Induced Reflex Muscle Activity

Further study details as provided by Bagcilar Training and Research Hospital:

Primary Outcome Measures:
  • latency of reflex muscle activity [ Time Frame: 1 month ] [ Designated as safety issue: No ]
    Whole-body vibration induced reflex muscle activity latency


Enrollment: 20
Study Start Date: January 2013
Study Completion Date: February 2013
Primary Completion Date: January 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: WBV group
whole-body vibration (WBV) group
Procedure: whole-body vibration (WBV)
whole-body vibration (4 mm amplitude, 25,30,35,40,45,50 Hz)
Other Name: Cyclic mechanical loading

Detailed Description:

Whole-body vibration (WBV), as a method of exercise training, is becoming increasingly popular in physical therapy, rehabilitation, and professional sports, and is increasingly used in beauty and wellness applications due to its beneficial effects on the neuromusculoskeletal system. These benefits include improved strength, power, flexibility, jump height, and balance. However, little is known about the physiological mechanisms underlying the effects of WBV on muscular performance, although the presence of reflex muscle activity during WBV has been shown. Tonic vibration reflex is the most commonly cited mechanism to explain the effects of WBV on muscular performance, although there is no conclusive evidence that TVR occurs. Studies have reported that direct vibration applied to a muscle or tendon stimulates muscle spindles, thereby causing a tonic vibration reflex to occur. As highlighted by these studies, muscle spindle discharges are sent to the spinal cord through Group Ia afferents during muscle or tendon vibration. There, they activate motoneurones that cause the muscle to contract. However, it has been reported that the sensitivity of the muscle spindle decreases or does not increase and that presynaptic inhibition occurs in Group Ia afferent fibers with vibration.

The bone myoregulation reflex (BMR) is another neurologic mechanism used to explain the effects of vibration on muscular performance. BMR is a reflex mechanism in which osteocytes exposed to cyclic mechanical loading induce muscle activity. Osteocytes embedded in the bone matrix are interconnected by numerous dendritic processes, forming a wide, mechanosensitive cellular network. Osteocytes exposed to cyclic mechanical loading send mechanical input signals to the central nervous system, influencing the neuronal regulation of muscle activity.

Investigators hypothesized that latency of WBV-IRMA is different from latency of TVR. Primary aim of this study is to determine latency of WBV-IRMA. Secondary aim is to investigate whether WBV-IRMA is explained with TVR.

Twenty healthy young adult men are planned to include in this study. Participants will stand upright with their knees locked during WBV. PowerPlate Pro5 will be used for WBV. WBV with high amplitude at 25,30,35,40,45 and 50 Hz will be applied. Surface electrodes will be placed on both the soleus muscles. To measure TVR latency, piezo-electric accelerometer will be placed on the achilles tendon and this achilles tendon will be stimulated with spring based mechanical reflex hammer. Our pilot study was showed that motor unit potentials (MUAP) occurred in a 1:1 response with vibration. After confirmation of this finding, WBV-IRMA latency will be measured in the present study. To measure WBV-IRMA latency, piezo-electric force sensor will be placed between heel and WBV platform. Exact moment of initial strike of heel when thrust force expressed by WBV begin to be transferred to body will be determined. The time between moment of the initial strike and corresponding MUAP is defined as "WBV-IRMA latency". Piezo-electric stretch sensor will be placed between knee and malleol to simulate muscle spindle. The reflex muscle activity of soleus muscles will be measured by PowerLab (data acquisition system, ADInstruments, Australia) device.

This project is planed to be completed in 1 months.

  Eligibility

Ages Eligible for Study:   20 Years to 45 Years
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Healthy men
  • Men with ages varying between 20 and 45 years
  • Right-handed men

Exclusion Criteria:

  • Bone, muscle/tendon, joint, vascular, dermatologic diseases in lower extremities and spine
  • Medication that could affect the musculoskeletal system
  • Postural abnormalities (scoliosis, kyphosis, etc)
  • Systemic diseases
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01780376

Locations
Turkey
Bagcilar Training & Research Hospital
Istanbul, Turkey
Sponsors and Collaborators
Bagcilar Training and Research Hospital
Investigators
Study Chair: ILHAN KARACAN, MD Bagcilar Training & Research Hospital
Principal Investigator: MUHARREM CIDEM, MD Bagcilar Training & Research Hospital
Principal Investigator: HALIL I CAKAR, PhD Fatih University Biomedical Engineering Instıtute
  More Information

No publications provided

Responsible Party: Bagcilar Training and Research Hospital
ClinicalTrials.gov Identifier: NCT01780376     History of Changes
Other Study ID Numbers: BEAH FTR-8
Study First Received: January 28, 2013
Last Updated: June 17, 2014
Health Authority: Turkey: Ministry of Health

Keywords provided by Bagcilar Training and Research Hospital:
whole-body vibration
latency
reflex response
muscle

ClinicalTrials.gov processed this record on November 19, 2014