| Purposes: Research on brain science has been becoming more and more popular inthe world, thus its corresponding research methods also have gradually become a hottopic in the field of brain science. Because of its non-invasive and high temporalresolution, nowadays ERP is becoming an important experiential and analysis methodto study the EEG signals. Event-related potentials (Event-related, potential, ERP) canreflect the neural electrophysiological activity related with individual cognitivefunction and it is an important means to study the changes associated with people’scognition. Effects of exercise on the nervous system has been confirmed now, butwhen the exercise intensity and exercise time change, the index of event-relatedpotential P300in previous studies will be not the same, and the changes of P50underthe exercise intervention have not been reported currently. In this experiment,according to change the amount of exercise, the exercise intensity and the exercisetime,and then to observe how the index of event-related potentials P50and P300behave, and then make a research,which aims to find out what the effects of P50andP300on the cognitive function are. And it also can provide a reference for theformulation of Brain Gym prescription.Methods: In this experiment,12male graduate students of the Shandong NormalUniversity were selected as the subjects and they would do the test for9times. Thetime interval is at least four days for each test on an individual. The test will useERGOMEDIC839E bicycle ergometer which is produced in the Swiss MONRKcompany as the load tool. Based on the experimental design requirements, we willchange the load in the test, in order to change the exercise intensity, the amount ofexercise and the exercise time. The experiment will collect the event－relatedpotential by using Shanghai Poseidon NDI－092EMG/evoked potential instrument.In the experiment the subject’s P50and P300should be measured respectively before and after riding a bicycle exercise, in order to observe the effect of exercise conditionson the event-related potentials P50and P300. In the test, the power, heart rate andRPE will be recorded per minute in order to monitor the changes of the exerciseintensity.Results: The latency of P300and the reaction time after a high intensity exercisewere significantly smaller than that before the exercise (P<0.05); the amplitude ofS2/S1after a high intensity exercise significantly increased (P<0.05); but thedifference value of S1and S2had a significant decrease, and the value of100×（1－S2/S1） also had a significant decrease(P<0.05). And the amplitude of P300, reactionrate, the latency of S1, the latency of S2, the amplitude of S1, the amplitude of S2were not significantly different before and after the incremental load to the highintensity pedaling motion (P>0.05). Before and after the increment motion to amoderate intensity exercise, the time of reaction significantly reduced (P<0.05); thelatency of P300, the amplitude of P300, response rate and P50showed no significantdifference (P>0.05). The indexes of P300and P50also showed no significantdifference before and after the incremental exercise to a low intensity exercise(P>0.05). The indexes of event-related potential P300showed no significantdifference before and after the same time exercises of different intensity-highintensity exercise, moderate-intensity exercise and low intensity exercise (P>0.05).As the components of P50, S1latency, S2latency and amplitude of S1showedno significant difference (P>0.05);The amplitude of S2significantly increased afterhigh strength constant load exercise (P>0.05), and the amplitude of S2showed nosignificant difference after constant load exercise of moderate intensity and lowintensity constant load exercise (P<0.05); S2/S1amplitude ratio and100×(1－S2/S1)were both significantly decreased before and after the same time exercises of differentintensity in high intensity constant load, moderate-intensity constant load and lowintensity constant load; The difference of S1－S2amplitude after high strengthconstant load exercise significantly increased (P<0.05), and showed no significantdifference after moderate-intensity constant load and low intensity constant load exercise（P>0.05）。Before and after a moderate intensity subjective desire exercise,the latency of P300were significantly decreased (P<0.05); the latency of P300had nosignificant difference before and after2/3time and1/3time of the moderate intensityexercise (P>0.05).Before and after the moderate intensity exercise at different time,the amplitude of P300, reaction time, and reaction rate all showed no significantdifference (P>0.05).Before and after the moderate intensity subjective desire exercise,the amplitude ratios of S2/S1increased significantly (P<0.05)but the values of100×(1－S2/S1) significantly decreased (P<0.05); before and after moderate intensityexercise at2/3and1/3of the total time, the amplitude ratios of S2/S1and the valuesof100×(1－S2/S1) showed no significant difference respectively (P>0.05). Beforeand after moderate intensity exercise at different time, the latency of S1, S2and theamplitude of S1, S2and the difference value of S1－S2amplitude showed nosignificant difference in each test(P>0.05).Conclusions: After the incremental motion came to be a high and a moderateintensity exercise, and then continue to exercise according to the subjective intention,this would have significant influence on the event related potential P300, the reactiontime and the changes of P300latency were especially significant. Effects of tipexercise on P300index that has certain intensity and time dependence characteristics,and exercise has great influence on the speed of neural information processing theinformation. High Intensity and long-time moderate intensity exercise can make thefunction of sensory gating significantly decreased. Effects of tip motion on eventrelated potential P50has the time and intensity dependence characteristics. For thephysical fitness exercise, to control the amount of exercise based on the moderateintensity subjective intention may be more reasonable. |
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