振動頻率與振幅對下肢屈膝姿勢之肌肉活化影響

Vibration frequency and amplitude on knee flexion posture Muscle activation

林明智(Ming-Chih Lin)

指導教授 ： 盧士一

中山醫學大學/健康管理學院/職業安全衛生學系/碩士(2019年)

https://doi.org/10.6834/CSMU201900260

摘要

本研究之目的是探討振動產生之肌肉運動和相應肌電訊號間的關係，並進而探討肌肉出力下，振動對股直肌活化之影響，而現今社會大多數的勞工在工作都需要長時間以站立姿勢進行作業，容易造成許多工作者肌肉不適、下肢疼痛等情形，勞工在工作上抱怨等情形，直接、間接的增加肌肉骨骼傷害風險及影響工作安全。本研究招募20名健康男性，針對振動頻率與振幅對腿部肌群影響的探討，受測者屈膝站立於全身振動器平台上，施以不同的頻率(20Hz、30Hz、40Hz、50Hz)與振幅(4mm、6mm、8mm)，利用生理肌電訊號儀量測肌肉活化程度，並使用加速規進行探討股直肌處之振動強度。
在研究中記錄肌電訊號(EMG)和三軸加速度訊號，收集來自受到振動暴露的20位受試者的肌群肌電訊號與加速度，不同頻率與振幅的振動通過正弦振盪平台遞送，經過加速度規與EMG數據訊號的分析處理來計算肌肉運動與活化情況。在實驗情境中，施加振動對股直肌的加速度與肌電反應有顯著的影響 研究結果發現股直肌的加速度對於不同振動頻率與振幅均有顯著的影響；而肌電圖訊號則對振動頻率的影響較顯著，振動振幅未達顯著差異。本研究可以評估下肢股直肌的疲勞程度與階段，尤其實驗使用加速度規對振動影響最為顯著，這可能是加速度規較接近振動源頭的關係 。

關鍵字

全身振動 ； 肌電圖 ； 肌肉疲勞 ； 股直肌

並列摘要

The purpose of this study was to investigate the relationship between muscle movements caused by vibration and the corresponding myoelectric signals, and to explore the effects of vibration on the activation of the rectus femoris under muscle output. Most workers in today's society need to work for a long time. Standing postures can easily cause muscle discomfort and lower limb pain in many workers. Workers complain about work and other situations, directly and indirectly increase the risk of musculoskeletal injury and affect work safety. This study recruited 20 healthy men to explore the effects of vibration frequency and amplitude on the leg muscles. The subjects stood on the whole body vibrator platform and applied different frequencies (20Hz, 30Hz, 40Hz, 50Hz) and amplitude. (4mm, 6mm, 8mm), the degree of muscle activation was measured by a physiological myoelectric signal meter, and the vibration intensity at the rectus femoris was examined using an accelerating gauge.
Electromyography (EMG) and triaxial acceleration signals were recorded in the study to collect myoelectric signals and acceleration from 20 subjects exposed to vibration. Vibrations of different frequencies and amplitudes were delivered through a sinusoidal oscillation platform. The analysis and processing of EMG data signals to calculate muscle movement and activation. In the experimental situation, the application of vibration has a significant effect on the acceleration of the rectus femoris and the myoelectrical response. The results show that the acceleration of the rectus femoris has a significant effect on different vibration frequencies and amplitudes; while the EMG signal is vibrating. The effect of frequency is more pronounced and the vibration amplitude is not significantly different. This study can assess the degree of fatigue and the stage of the rectus femoris muscle, especially the use of acceleration gauges, the most significant impact on vibration, which may be the relationship of the acceleration gauge closer to the source of vibration.

並列關鍵字

whole body vibration ； electromyography ； muscle fatigue ； rectus femoris

參考文獻

1. Tissot, F., Messing, K., Stock, S. (2005). Standing, sitting and associated working　conditions in the Quebec population in 1998. Ergonomics. 48 (3): 249-269.

2. King, P. M. (2002). A comparison of the effects of floor mats and shoe in-soles on standing fatigue. Applied Ergonomics. 33: 477- 484.

3. Waters, T. R., Dick, R. B. (2015). Evidence of Health Risks Associated with Prolonged Standing at Work and Intervention Effectiveness. Rehabil Nurs. 40(3): 148–165.

4. Halim, I., Arep, H., Kamat, S. R., Abdullah, R., Omar, A. R., Ismail, A. R. (2014). Development of a Decision Support System for Analysis and Solutions of Prolonged Standing in the Workplace. Safety and Health at Work. 5: 97-105.

5. 張銘坤、盧士一(2008)。全身振動暴露評估之回顧。勞工安全衛生研究季刊，第16卷第2期，第152-163頁。