- ICH GCP
- 미국 임상 시험 레지스트리
- 임상시험 NCT01908439
A Simple Method to Determine the Reflex Latency During WBV
A Simple Method to Determine the Reflex Latency During Whole Body Vibration
The purpose of this study was to examine the validity of the measurement method based on observation of vibration stimulation-MUAP (motor unit action potential) (1 to 1) matching that helps to measure human WBV-induced muscular reflex latency and to compare these results with the latency determination obtained using the classical methods. The investigators' principle hypothesis is that the simple method is capable of determining the WBV induced reflex response latency as reliably as the complex methods described earlier.
To achieve this goal, the investigators have averaged the electrical responses of the soleus muscle (sEMG and multi motor unit (MMU) potential) against the vertical force data obtained during all the six vibration frequencies tested in this study. The investigators have then combined all the averaged EMG data belonging to six different vibration frequencies to generate the 'cumulative averaged' sEMG and MMU for each subject. The investigators have also obtained the standard error for the cumulative averaged records which indicated the WBV-induced muscular reflex (WBV-IMR) latency.
연구 개요
상세 설명
Subjects Five healthy volunteers will be participated in the study.
Procedures During WBV, the subjects will be asked to stand upright on a vibration platform (PowerPlate Pro5, London, United Kingdom). Their hips and knees will be in a neutral position. Subjects will be barefooted, and no sponge or foam will be placed between the vibration platform and their feet (Figure 1). The whole plate oscillates with a linear movement upward and downward. Vibration amplitude is 2.2 mm. WBV frequencies will be varied randomly to cover the following six frequencies: 25, 30, 35, 40,45 and 50 Hz. Each frequency lasts for 60 seconds and there will be a 15 seconds rest in between different frequencies.
A load sensor (FC2331-0000-2000L Compression Load Sensor, France) will be fixed on the WBV platform in order to be able to determine induced muscular response latency. Subjects will be positioned on the WBV platform such that their right heel will be placed on the load sensor.
Recordings MMUs, surface EMG (sEMG) and force recordings will be simultaneously done using the Powerlab data acquisition system (ADInstruments, Oxford, United Kingdom). A sampling frequency of 40 kiloHertz (kHz) will be used. Data will be analyzed offline using the MATLAB (R2012a 7.14.0.739).
In order to record sEMG, Ag/AgCl electrodes [KENDALL ® Arbo] with a disc radius of 10 mm will be placed 20 mm apart on the right soleus muscle belly, on shaved skin cleaned with alcohol. The ground electrode will be placed on the lateral malleolus.
To record MMU activity, a pair of Teflon® insulated silver wires (75 µm in core diameter) will be used. About 3 mm of the tips of the silver wires will be stripped of their Teflon ® coating in order to be able to record the activity of several motor units. The pair of wires will be inserted into the right soleus muscle with a 25 G needle. Needle will be immediately withdrawn leaving the fish-hooked wires in the muscle. A lip-clip electrode will be used as the ground electrode.
All cables will be carefully taped to the skin to minimize mechanical artifacts.
The subjects will be instructed to relax their muscles throughout the recordings and were trained using EMG feedback to this end. WBV may impair the sense of balance and muscles may be activated to restore balance. To overcome this issue, the subjects will be familiarized with WBV with a 15 s session of WBV, the subjects will be asked to use the handles of the WBV device to secure their balance and the base of support (distance between the heels) will be adjusted as wide. The distance between the heels usually will be about 25 cm.
Filtering and Rectification regimens All force sensor recordings will be 5 Hz high-pass filtered. All sEMG recordings will be 80 - 500 Hz band-pass filtered (Butterworth 1st order) and full-wave rectified to overcome movement artifacts. All MMU recordings will be 100-5000 Hz band-pass filtered (Butterworth 1st order) and full-wave rectified.
WBV - induced muscular reflex (WBV-IMR) latency
In a previous study, right soleus muscle sEMG measurement and force sensor measurement that is placed under right heel during WBV were taken synchronously and it was found that vibration stimulation and MUAPs would be matched 1 to 1. In this study that is based on the previous observation, it is predicted that it is possible to calculate latency by using averaging method.
All MMU and sEMG data will be analyzed by applying respectively filtering, rectification and differentiation with MATLAB (R2012a 7.14.0.739). Data analysis will be performed in two stages:
- Detection of the moment of mechanical stimulation threshold (Force Sensor Data Averaging): Force sensor data will be averaged by using Spike triggered averaging (STA) method. For this, 50 seconds of constant time intervals of preset vibration frequency in a WBV set will be used. All the positive peaks in both MMU and sEMG traces will be marked. For all the positive peaks, the force sensor trace will be segmented covering 75 ms previous positive peak. After, cumulative average of these 6 vibration sets will be averaged. The standard error on the cumulative averaged force records will be calculated. The lowest point of standard error on force sensor averaging graphic will be considered as the starting point of mechanical stimulation that triggers the muscle response.
- Determination of the MUAP onset: EMG data averaging method and manual method (vibration stimulus and MUAP coupling) will be used.
연구 유형
등록 (실제)
단계
- 해당 없음
연락처 및 위치
연구 장소
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İstanbul, 칠면조
- Bağcılar Training & Research Hospital
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참여기준
자격 기준
공부할 수 있는 나이
건강한 자원 봉사자를 받아들입니다
연구 대상 성별
설명
Inclusion Criteria:
- Young adult (20-45 yrs)
- Healthy
- Right handed
Exclusion Criteria:
- Any health problems
- Left handed
공부 계획
연구는 어떻게 설계됩니까?
디자인 세부사항
- 주 목적: 기초 과학
- 할당: 해당 없음
- 중재 모델: 단일 그룹 할당
- 마스킹: 없음(오픈 라벨)
무기와 개입
참가자 그룹 / 팔 |
개입 / 치료 |
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실험적: Whole-body vibration
A new method for muscle reflex latency measurement
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High amplitude whole-body vibration
다른 이름들:
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연구는 무엇을 측정합니까?
주요 결과 측정
결과 측정 |
기간 |
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Latency measurement method
기간: 1 day
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1 day
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공동 작업자 및 조사자
수사관
- 연구 의자: ILHAN KARACAN, MD, Bagcilar Training & Research Hospital
연구 기록 날짜
연구 주요 날짜
연구 시작
기본 완료 (실제)
연구 완료 (실제)
연구 등록 날짜
최초 제출
QC 기준을 충족하는 최초 제출
처음 게시됨 (추정)
연구 기록 업데이트
마지막 업데이트 게시됨 (추정)
QC 기준을 충족하는 마지막 업데이트 제출
마지막으로 확인됨
추가 정보
이 연구와 관련된 용어
키워드
기타 연구 ID 번호
- BEAH FTR-9
약물 및 장치 정보, 연구 문서
미국 FDA 규제 의약품 연구
미국 FDA 규제 기기 제품 연구
미국에서 제조되어 미국에서 수출되는 제품
이 정보는 변경 없이 clinicaltrials.gov 웹사이트에서 직접 가져온 것입니다. 귀하의 연구 세부 정보를 변경, 제거 또는 업데이트하도록 요청하는 경우 register@clinicaltrials.gov. 문의하십시오. 변경 사항이 clinicaltrials.gov에 구현되는 즉시 저희 웹사이트에도 자동으로 업데이트됩니다. .
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