선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- In order to characterize the time-dependent change of MDF data, the regression analysis has been used, and its derivative parameters such as initial slope, initial value and fatigue index have been employed as the fatigue determining variables in many studies (Krivickas et al, 1998; Merletti et al, 1990; Merletti et al 1995; Merletti et al, 1996; Merletti et al, 1998; Standridge et al, 1988). All of these studies obtained EMG data from isometric exercises, and the time-plot of the MDF data were close to the decreasing quasi-linear regression model. Meanwhile, it has been known that the MDF decrease is rather small because both the local muscle blood supply and muscle temperature increase due to repetitive changes in muscle length during dynamic exercise (Arendt-Nielsen and Sinkjaer, 1991; Basmajian and DelLuca, 1985; Soderberg and Cook, 1984).
- As another complement for the problem, this study tried to synchronize the epoch of FFT to the cycle of isotonic exercise, 2.4 seconds. It reduced the noise of MDF data more or less, but other preliminary trials using FFT epoch of 2.
- Accordingly, it was thought that the periodicity of repeated exercise can be a reason to cause noise in MDF data but it could not be the main component of it. From these findings, the focus of this study shifted from the periodicity of exercise to finding out proper methods for reducing noise in the MDF data, which was obtained with FFT epoch of .5 seconds.
- The purpose of this study is to compare three methods including digital low pass filter in their noise reduction effect for MDF data of fatiguing isotonic exercise. If one of the methods comes out to be satisfactory, it will enable the portable muscle fatigue monitor to provide reliable MDF data and fatigue determining variables, making the machine useful in various situations of strengthening exercises.
- Recent studies on the regression model of MDF data in fatiguing dynamic exercise, which has been scarce, revealed that it was close to linear regression model (Gamet et al, 1993; Potvin, 1997). Therefore, in this study, the linear regression model and its fatigue determining variables such as initial value, slope, and fatigue index were employed. The study on the intra-subject and inter-subject reliability of these variables in fatiguing isotonic exercise is under way in our laboratory.
대상 데이터
- was used for picking up EMG signals. It had three circular metal disk electrodes with a diameter of 12 ㎜, which were fixed in the form of an equilateral triangle with the center-to-center distance of 20 ㎜. Among these, the active and reference electrodes were laid in the direction of muscle fiber, and the ground electrode was laid lateral or medial to those two.
- Nineteen healthy college men volunteered for this study. None of them were athletes, had history of pathology in musculoskeletal or nervous system of the upper extremities and did regular muscle strengthening exercises.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.