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Sympathetic Stress and Whole Body Vibration Reflex

NCT05478447 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 22

Last updated 2022-10-13

No results posted yet for this study

Summary

Whole body vibration (WBV) is a therapeutic modality in the form of exercise on a vibrating platform with an amplitude of 2-4 mm at a frequency of 25-50 Hz, which is used with increased popularity in sports medicine and rehabilitation due to its beneficial effects on muscle strength, balance, postural control, bone formation, and circulation. Beneficial effects on muscle strength and athletic performance have been reported. Spinal reflexes explain these beneficial neuromuscular effects. However, the neuronal circuit and receptors of the reflex response have not been defined precisely. A group of researchers propose that the reflex system underlying the neuromuscular effects of WBV is the Tonic vibration reflex (TVR), whose receptor is the muscle spindle; other researchers claim that the reflex latency induced by WBV is 4-5 ms longer than the TVR latency, so it is a bone myoregulation reflex whose receptor is osteocytes.

The muscle spindle has sympathetic innervation. It has been reported that in case of increased sympathetic activity, muscle spindle sensitivity may increase and short-latency stretch reflex may be facilitated. The variation of muscle spindle activity with sympathetic activity may provide an opportunity to define the nature of the reflex response during WBV. Muscle spindles are more sensitive to vibrations around 100 Hz. This study has two hypotheses: According to the first hypothesis, WBV activates muscle spindles and the reflex latency induced by WBV is the same as TVR latency, and the latency does not change with increased sympathetic activity. According to the alternative hypothesis, WBV activates osteocytes, and WBV-induced reflex latency is longer than TVR latency. With increased sympathetic activity, the WBV reflex becomes dominant and the WBV-induced reflex latency becomes shorter. The aim of this research is to determine which of these two hypotheses is valid.

Conditions

  • Vibration; Exposure
  • Muscle Physiology

Interventions

PROCEDURE

Vibration

whole-body vibration, and tendon vibrations will be applied to the human body

Sponsors & Collaborators

  • Istanbul Physical Medicine Rehabilitation Training and Research Hospital

    lead OTHER_GOV

Principal Investigators

  • İlhan Karacan, Assoc Prof · Istanbul Physical Medicine Rehabilitation Training & Research Hospital

Study Design

Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
20 Years
Max Age
45 Years
Sex
MALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-09-09
Primary Completion
2022-09-29
Completion
2022-09-30

Countries

  • Turkey (Türkiye)

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05478447 on ClinicalTrials.gov