不同经颅脉冲电刺激方案对体力-认知混合任务疲劳消除的效果

Effects of Different Transcranial Pulse Current Stimulation Programs on Fatigue Elimination in Physical Cognitive Mixed Tasks

目的:探讨不同经颅脉冲电刺激(tPCS)方案对体力-认知混合任务疲劳的消除效果。方法:选取30名健康大学生运动员,将其随机均分为Ⅰ’组和Ⅱ’组,每组各15人。随后两组被试均在功率自行车上运动,Ⅰ’组用主观疲劳量表(RPE)筛选出符合中度体力-认知混合任务疲劳标准的被试10人,Ⅱ’组用RPE筛选出符合重度体力-认知混合任务疲劳标准的被试10人。每组被试均接受5次tPCS干预(刺激方案A、B、C、D、E),每次干预前后均对被试进行心率变异性(HRV)与氧合血红蛋白(HbO2)浓度的测试,并判断不同刺激方案对不同程度体力-认知混合任务疲劳消除的效果,其中HRV的测量指标包括:相邻RR间期差值的均方根(RMSSD)、正常窦性R-R间期均值标准差(SDNN)、高频(HF)和低频(LF)。结果:(1)经过tPCS干预后,SDNN、HF和HbO2的值显著上升(P<0.05),LF值显著下降(P<0.05)。(2)在中度体力-认知混合任务疲劳中,tPCS方案D(20 min,感觉强度)干预后各指标变化幅度最大。(3)在重度体力-认知混合任务疲劳中,tPCS方案C(20 min,感觉强度+0.2 mA)干预后各指标变化幅度最大。结论:(1)运动员在产生体力-认知混合任务疲劳后,不同的tPCS刺激方案对体力-认知混合任务疲劳消除效果的强弱存在差异,且对于不同程度的体力-认知混合任务疲劳可能存在一个最适“刺激剂量”;(2)5种干预方案对运动员体力疲劳消除的效果表现为:对运动员中度体力-认知混合任务疲劳的消除,tPCS方案D(20 min,感觉强度)效果最好;对运动员重度体力-认知混合任务疲劳的消除,tPCS方案C(20 min,感觉强度+0.2 m A)效果最好。

Objective To explore the effect of different transcranial pulse current stimulation(tPCS)program on the elimination of fatigue in physical cognitive mixed tasks.Methods Thirty healthy college athletes were randomly divided into group I'and group Ⅱ',each of 15.Then,both groups of sub-jects exercised on power bicycles.Ten subjects were screened from Group I'and Ⅱ'meeting the crite-ria of moderate and severe physical cognitive mixed task fatigue using the Rating of Perceived Exer-tion respectively.Both groups received five tPCS interventions.Before and after each intervention,the subjects were tested for heart rate variability(HRV)and oxygenated hemoglobin(HbO.)concentration,and the effect of different stimulations on the fatigue elimination in physical cognitive mixed tasks of different severities were measured.Meanwhile,the HRV measurements included root mean square of difference between adjacent R-R intervals(RMSSD),standard deviation of all normal-to-normal intervals(SDNN),high frequency(HF)and low frequency(LF).Results①After tPCS intervention,the average SDNN,HF and HbO increased significantly(P<0.05),while the average IF decreased significantly(P<0.05).②In physical cognitive mixed task of moderate fatigue,the biggest change of each index appeared after the tPCS program D(20 min,sensory intensity).③In the physical cognitive mixed task of severe fatigue,the change range of each index was the largest after the tPCS program C(20 min,sensory intensity+O.2 mA).Conclusion After physical cognitive mixed tasks,different tPCS stimulation programs have different effects on the elimination of fatigue with an optimal"stimulant dose".②The effects of five intervention programs on the elimination of physical fatigue of athletes are as follows:For the elimination of moderate fatigue of physical cognitive mixed task,program D of tPCS(20 min,sensory intensity)has the greatest effect,while for the elimination of severe fatigue of physical cognitive mixed task,program C of tPCS(20 min,sensory intensity+0.2 mA)has the greatest effect.