摘要
目的探讨静态运动负荷诱发肌肉疲劳过程中表面肌电信号 (sEMG)疲劳相关特征变化的非疲劳特异性。方法记录 1 0名被试者等长屈肘收缩 1min肱二头肌和肱三头肌sEMG的信号 ,分析MPF、MF、ZCR、AEMG和Lempel ziv复杂度各项疲劳相关性指标的变化 ,并测量肱三头肌在疲劳运动负荷试验前、后的MVC值。结果肱二头肌在持重负荷过程中MPF、MF、ZCR和Lempel ziv复杂度均随着负荷持续时间呈线性规律递减 ,AEMG呈线性规律递增 ;肱三头肌的MVC在疲劳运动负荷前后无明显变化 ,分别为( 1 4 .0± 3.2 )kg和 ( 1 4 .6± 2 .6)kg。但MPF、MF、ZCR和Lempel ziv复杂度也呈线性递减变化且变化率明显大于肱二头肌 ,而AEMG无明显变化。结论sEMG信号线性时、频和非线性复杂度的变化不具有肌肉疲劳特异性 ,疲劳可能不是造成上述指标变化的唯一因素。
Objective To investigate the non fatigue specificity of the changes of the fatigue related parameters of sEMG signal during muscle static contractions. Method The sEMG signals of biceps brachii (BB) and triceps brachii (TB) were recorded in 10 subjects during 1 min sustained right elbow isometric flexion. Changes of a series of fatigue related indices such as MPF、MF、ZCR、AEMG and Lempel ziv complexity were then analyzed. MVCs of the extensor (TB) were measured before and immediately after fatiguing flexion. Result MPF、MF、ZCR and Lempel ziv complexity of BB all decreased regularly and linearly with continuation of contraction. Whereas AEMG of BB increased linearly. The MVCs of TB were (14.0±3.2)kg and (14.6±2.6)kg respectively before and after BB fatiguing contraction. But the slopes of decrease of MPF、MF、ZCR and Lempel ziv complexity of TB were significantly steeper than those of BB. The AEMG of TB was almost unchanged. Conclusion The changes of time and frequency domain indices and Lempel ziv complexity of sEMG signal were not as a result of muscle fatigue specifically. Fatigue might not be the only factor that caused the changes of the indices mentioned above .
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2004年第1期39-43,共5页
Space Medicine & Medical Engineering
基金
国家自然科学基金项目 ( 3 0 170 44 7)
中国 -芬兰政府间 2 0 0 3 -2 0 0 4年度科技合作项目 (AM10 2 1)
