目的:本工作旨在通过表面肌电图(SEMG)和超声生物成像(USBI)分析维生素能量饮料对肌肉疲劳的影响。
方法:选择20名健康男性进行增加负荷疲劳试验。基于改进阈值的小波阈值函数采集表面肌电信号和超声生物图像。时域和频域特征集成肌电图(IEMG),均方根振幅(RMS),平均功率频率(MPF),并分析了表面和深层肌肉的形态变化。血红蛋白浓度(HB),红细胞数(RBC),红细胞平均体积(MCV),血乳酸(BLA),丙二醛(MDA),测定磷酸肌酸激酶(CK)。
结果:1)准确性(94.10%),灵敏度(94.43%),特异性(93.75%),和精度(94.07%)的长短期记忆(LSTM)特异性对肌肉疲劳的识别高于其他模型。2)与对照组相比,BLA的水平,MDA,实验组运动后CK降低,HB水平升高(P<0.05)。3)实验组IEMG和RMS高于对照组,随时间增加(P<0.05)。4)响应信号的平均幅度随时间减小。与对照组相比,表面肌肉厚度,深层肌肉厚度,总肌肉厚度,对比,和均匀性(HOM)在实验组中降低;而角二阶矩(ASM)和对比度增加,差异有统计学意义(P<0.05)。
结论:表面肌电信号和超声生物图像可作为运动过程中肌肉疲劳的辅助监测技术。运动前饮用维生素能量饮料,可以在一定程度上缓解身体疲劳,促进肌肉微观结构的维持。
This work was aimed to analyze the effect of vitamin energy drink on muscle fatigue by surface electromyography (SEMG) and ultrasonic bioimaging (USBI).
20 healthy men were selected to do increasing load fatigue test. Surface electromyographic signals and ultrasonic biological images were collected based on wavelet threshold function with improved thresholds. Time domain and frequency domain characteristic integrated electromyography (IEMG), root mean square amplitude (RMS), average power frequency (MPF), and surface and deep muscle morphological changes were analyzed. Hemoglobin concentration (HB), red blood cell number (RBC), mean volume of red blood cell (MCV), blood lactic acid (BLA), malondialdehyde (MDA), and phosphocreatine kinase (CK) were measured.
1) the Accuracy (94.10%), Sensitivity (94.43%), Specificity (93.75%), and Precision (94.07%) of the long and short-term memory (LSTM) specificity for muscle fatigue recognition were higher than those of other models. 2) Compared with the control group, the levels of BLA, MDA, and CK in the experimental group were decreased and HB levels were increased after exercise (P < 0.05). 3) IEMG and RMS of the experimental group were higher than those of the control group, and increased with time (P < 0.05). 4) The mean amplitude of the response signal decreased with time. Compared with the control group, the surface muscle thickness, deep muscle thickness, total muscle thickness, contrast, and homogeneity (HOM) decreased in the experimental group; while the angular second moment (ASM) and contrast increased, showing great differences (P < 0.05).
Surface electromyographic signal and ultrasonic biological image can be used as auxiliary monitoring techniques for muscle fatigue during exercise. Drinking vitamin energy drinks before exercise can relieve physical fatigue to a certain extent and promote the maintenance of muscle microstructure.