tDCS刺激对膝关节和肘关节肌群肌力的影响

Effect of tDCS Stimulation on Muscle Strength of Knee and Elbow Joint

目的:研究经颅直流电刺激(tDCS)运动中枢和情绪中枢对膝关节和肘关节屈伸肌群肌力的影响。方法:对南京体育学院体育教育与人文学院体育教育专业14名男性健康志愿者进行2 mA 20 min运动中枢与情绪中枢的tDCS阳性刺激,对被试者刺激后的膝关节和肘关节屈伸肌群的即刻力矩峰值与平均力矩峰值,采用配对样本T检验。结果:(1)受试者接受运动中枢和情绪中枢tDCS刺激后,膝关节和肘关节肌群的即刻肌力都有所提高;(2)tDCS刺激运动中枢后的膝关节伸肌、肘关节伸肌和屈肌即刻峰值力矩提升显著(P<0.05),膝关节屈肌的即刻峰值力矩提升不显著(P>0.05);(3)tDCS刺激情绪中枢后膝关节和肘关节屈伸肌群肌力提升不显著;(4)tDCS刺激运动中枢和情绪中枢后,除膝关节伸力的平均力矩峰值衰退较小外,膝关节屈力、肘关节伸力和屈力的平均力矩峰值都明显衰退。结论:(1)tDCS刺激运动中枢对膝关节和肘关节屈伸肌群肌力的提升效果好于刺激情绪中枢;(2)tDCS刺激运动中枢对膝关节肌群伸力的衰退效应较小。

Objectives:This study aimed to evaluate the effect difference of knee joint and elbow joint muscle group’s promotion between motor center and emotional center by transcranial direct current stimulation(tDCS).Method:The tDCS was applied at 2mA for 20 min to fourteen adult male students from Nanjing Sports Institute,aged 20~25 years.Paired sample t-tests was used to test the immediate peak torque and average peak torque of knee and elbow flexor and extensor muscles after stimulation.Results:(1)The immediate muscle strength of knee and elbow muscles increased after the subjects were stimulated by tDCS of motor center and emotional center;(2)The immediate peak torque of knee extensor,elbow extensor and flexor increased significantly after tDCS stimulation(P<0.05),but the immediate peak torque of knee flexor did not increase significantly(P>0.05);(3)The muscle strength of knee and elbow flexor and extensor muscles did not increase significantly after the emotional center tDCS stimulation;(4)The average torque peak after tDCS stimulation of motor center and emotional center decreased significantly in knee flexion,elbow extension and flexion,except that the decline of knee extension was small.Conclusion:(1)The effect of tDCS stimulation on motor center is better than emotional center in terms of the muscle strength of knee and elbow flexor and extensor muscles;(2)TDCS stimulation on motor center has little effect on the decline of knee muscle group extension.