| Background and objective:With the rapid development of technology,the combination of sports training and new technology has become the general trend and the development direction of competitive sports training.Transcranial direct current stimulation(tDCS)is a non-invasive brain stimulation technology,which can regulate the activity of cortical nerves by applying low-intensity current to specific brain areas through electrodes placed in the skull.In recent years,the influence of tDCS on human motion ability and its timeliness has become a research hotspot.However,there are different opinions on the influence of tDCS on motion performance.Moreover,there is still a gap in the study of the effect of tDCS on the vertical jump and its internal mechanism.Therefore,we use three types of tDCS as intervention means,to investigate the effect of tDCS on the vertical jump height of the healthy men in different periods(before and after the tDCS intervention)and its timeliness.The neuromuscular mechanism of the effect of transcranial direct current stimulation on the vertical jump ability of human was explored by using surface electromyography.In conclusion,we aim to provide theoretical and experimental basis for the application of transcranial direct current stimulation technology in related sports training.Method:21 healthy male college students participated in the experiment.Vicon infrared high-speed motion capture system(100Hz),Kistler threedimensional force measuring platform(1000Hz)and Delsys surface electromyography acquisition system(2000Hz)were used to collect the vertical jump movements of the subjects before,0 min,30 min and 60 min after tDCS intervention.Each subject was tested three times.Every test contained one stimulation mode,including anodal tDCS,cathodal tDCS and sham tDCS.The interval between the two tests was at least 48-72 h.The vertical jump was divided into eccentric and concentric phases,and the RMS amplitudes of rectus femoris,tibialis anterior,biceps femoris,gastrocnemius lateral and gastrocnemius medial were calculated.The calculation indexes include jump height,muscle contribution rate and muscle co-activation.In this study,two-way repeated ANOVA was used.The significance level was defined as p<0.05.Result:(1)Vertical jump height: the vertical jump height of subjects shows a 1.22 cm enhancement after A-tDCS immediately(p<0.05),the height become lower at the moment of 0 min,30 min,60 min after C-tDCS compared with the pre-stimulation(p<0.05).There was no significant change in the vertical jump height of subjects after the intervention of sham tDCS.In addition,there was no difference in jump height between groups.(2)Muscle activation level: In the eccentric phase of vertical jump,the activation level of tibial anterior muscle increased significantly after AtDCS immediately(p<0.05).The activation level of tibial anterior muscle has a decrease at the moment of 0 min,30 min,60 min after C-tDCS(p<0.05).In the concentric phase of vertical jump,the activation level of rectus femoris and gastrocnemius increased significantly after A-tDCS immediately(p<0.05),and decreased significantly at the moment of 0min,30 min,60 min after C-tDCS(p<0.05).(3)Muscle contribution rate: In the eccentric phase of vertical jump,the contribution rate of tibial anterior muscle increased significantly after AtDCS immediately(p<0.05),and decreased significantly at the moment of 0min,30 min,60 min after C-tDCS(p<0.05).In the concentric phase of vertical jump,the contribution rate of gastrocnemius increased significantly after A-tDCS immediately(p<0.05),and decreased significantly at the moment of 0 min,30 min,60 min after C-tDCS(p<0.05).(4)Muscle co-activation: In the concentric phase of vertical jump,the co-activation of hip joint and ankle joint decreased significantly after AtDCS(p<0.05).The co-activation of hip joint and ankle joint increased significantly after C-tDCS(p<0.05).Conclusion:Anodal tDCS can improve the jumping height of human body and has a positive effect on the improvement of human motion performance.Cathodal tDCS can reduce the vertical jump height of human body and inhibit the motion performance of human body to a certain extent.The post effect of tDCS may last for one hour,but because the duration of the significant change of vertical jump height after the intervention of anodal tDCS and cathodal tDCS is different in this study,the post effect of tDCS should be further studied.Anodal tDCS can improve the level of muscle activation,improve the contribution rate of the main muscle in the process of vertical jump,improve the ability of muscle coordination and control,and have a positive impact on the performance of human vertical jump.To sum up,the anodal tDCS can improve the performance of vertical jump,which provides a theoretical basis for the use of tDCS in improving the performance of vertical jump related sports. |
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