Effects Of Different Intensity Exercise - Induced Fatigue On Auditory Evoked Potential P50 And Event - Related Potentials P300 In Male College Students

Sports has been booming in the world and competitive sports demands thatathletes will endure a long-time and intensive training almost under extremeconditions, which results in the appearance of scientific training research and itbecomes increasingly popular. The competitive level of athletes has been improved bythe spiral and repeated cycle way in the "sportsâ†'fatigueâ†'restorationâ†'a higher levelsof sportsâ†'fatigue againâ†'a higher level of restoration" mode. Exercise-inducedfatigue research has already been in the sights of the scholars and become animportant research direction, which focuses on interpreting the scientific mechanismof exercise-induced fatigue from multiple disciplines and multi-dimensional way inorder to promote the scientific training of athletes and the development of sportsscience.This experiment operates different scale of sports fatigue for13male collegestudents of physical education department. This experiment will has immediateauditory evoked potential P50test and event related potential P300test for thesubjects. The data which obtains from the experiment will compare with the data ofthe quiet state for statistical analysis and find the effect of exercise-induced fatigue ofauditory evoked potential P50and event related potential P300in order to concludethe logical relationship between them, which will provide certain scientific basis andtheoretical support for the study of fatigue and scientific training.This study planed to recruit13freshman or sophomore boys from institute ofphysical education of Shandong normal university as volunteers. Before volunteersjoined in the experiment, the experimenters first made PARQ&YOU questionnaire onvolunteers, which needed volunteers to fill in the physical activity index, to ensure thephysical health of volunteers and withstanding of sports load and intensity; before theexperiment, the experimenters used BFS mood scale to tested the subjects’psychological states to ensure the stable and healthy psychological state of volunteersand ensure the safety of the experiment. According to actual situation, every volunteerwas asked to fill in a guarantee called "subjects were familiar with the experiment", in which the content included the description of the experiment (for example: researchers,research purpose, research process, the risks and discomfort and income) to ensuredthat the volunteers could have a clear understanding of the lab. After the volunteershaving a detailed understanding of the experiment, the researchers needed toemphasize the problems and requirements in the process of experiment in order toensure the experiment’s safe and smooth. We performed a four-week’s testexperiments: in the first week, we tested the auditory evoked potential P50and eventrelated potential P300of the subjects under resting states; in the second week, weguided each subject to do the high strength movement to fatigue on the treadmill for aconstant heart rate ((220-age) X85%), and after the fatigue, we test immediately thesubjects’ auditory evoked potential P50and event related potential P300indexes; inthe third week, we guided each subject to do the moderate-intensity movement tofatigue on the treadmill for a constant heart rate ((220-age) X75%), and after thefatigue, we tested immediately the subjects’ auditory evoked potential P50and eventrelated potential P300indexes; in the fourth week, we guided each subject to do thelow-intensity movement to fatigue on the treadmill for a constant heart rate ((220-age)X65%), and after the fatigue, we tested immediately the subjects’ auditory evokedpotential P50and event related potential P300indexes. The test of each index adoptsNDI-092type emg/induce electrical detector test of potentiometer manufactured byShanghai Haishen medical electronic instrument factory. First of all, electrodescontacted with the skin are soaked with saline water to ensure good electricalconductivity. Then, we looked for volunteers’ heads to put the point of the electrode.For the long hair volunteers, we should first comb the hair from the middle so thatelectrode point clearly could come out. We putted on the electrode cap to volunteersand made use of the concentration of75%alcohol on volunteers’ electrodes point towipe the degreasing process, and applied various points to ensure good electricalconductivity. Next, we helped the volunteers put electrodes, respectively mounted onthe head of the front copular FPz points, Fz points, Cz points, Pz points, and the leftearlobe (A) point, with electrode cap. Then we made the connection: connected theFPz point with the grounding electrode, reference electrode with the left earlobe (A) point. We also recorded the electrodes respectively in Cz and Fz points and Pz point totest electrode resistance less than5000ohms.(left earlobe A point is wiped withconcentration of75%alcohol to degrease and daubed electrode paste, and then use thedisposable electrodes to fix).Test results show that:(1)through the data from the low intensity exercise toexercise induced fatigue shows that in comparison with resting state, Cz point ofamplitude, Fz point of amplitude and Pz point of amplitude of event related potentialP300indexes of the subjects under the low-intensity exercise-induced fatigue state areextended; Pz point’s reaction time is significantly shortened (P﹤0.05), and Czpoint’s and Fz point’s reaction time show extremely significant difference (P﹤0.01).(2) through the data from the moderate intensity exercise to exercise induced fatigueshows that in comparison with resting state, Cz point of amplitude, Fz point ofamplitude and Pz point of amplitude of event related potential P300indexes of thesubjects under the moderate-intensity exercise-induced fatigue state show a trend ofextending, and Cz point of amplitude and Fz point of amplitude are significantlyprolonged (P﹤0.05); Cz point’s, Fz point’s and Pz point’s reaction time aresignificantly shortened (P﹤0.05), and Cz point’s reaction time (P﹤0.01),compared with resting state, is extremely significant difference; Pz point’s incubationperiod is shortened, compared with resting state (P﹤0.01).(3)through the data fromhigh intensity exercise to exercise induced fatigue shows that in comparison withresting state, Cz point of amplitude, Fz point of amplitude and Pz point of amplitudeof event related potential P300indexes of the subjects under the high-intensityexercise fatigue state are extended without significant changes; Cz point’s, Fz point’sand Pz point’s reaction time show a trend of shortening（P﹤0.01）,but the change ofFz points’ reaction time and Pz point’s reaction time are not significant, only Czpoint’s reaction time is significantly shortened (P﹤0.01). Auditory evoked potentialP50S1, S2, S2/S1ratio under high intensity exercis1/.e induced fatigue state show atrend of increasing, but the trend is not obvious (P>0.05).(4) While comparing withresting state, auditory evoked potential P50does not show significant difference, butafter the experiment, we find S2/S1value increased gradually as the intensity increases gradually. The conclusion is: with the increase of strength, the sensoryirrelevant stimulus ability of the subjects after fatigue is weakened; the brain and thecentral nervous attention resource devotion present U change, after the moderateintensity exercise induced fatigue, the central nervous attention resources is thebiggest and the efficiency is the best; exercise induced fatigue can optimize people’scognitive function and help people to speed up the information processing of thecentral nervous system and the input of attention resource, and presents the bestchange after the medium intensity exercise fatigue.