| Research purpose: With the development of our economy and society, the level of sports contest are higher and the competition are also more competitive than before, which certainly increase the sports intensity of sporters. As a result, the intensity of sports may exceeds the bearing capacity of the body in the process of sports contest, athletic training and even exercise. If the fatigue can’t be eliminated timely after a fierce competition and high-intensive training, it will have a bad impact on sports performance and sporters’ health. Therefore, the scholars have given much more attention to the alleviation of sports fatigue and it’s recovery. So the magnetic stimulation, a mild therapeutic method to alleviate sports fatigue, is brought to the forefront, which is simple to operate and can also avoid cross-infection.Research Methods:This study uses experiment, 60 mice were randomly divided into normal group, the swimming group, low-intensity group, the high-intensity group, the normal group by conventional breeding, no treatment. The mice in swimming group swam with loads every weeks, which lasted 8 weeks. The mice in Low-intensity group swam with loads every weeks and after training they were put into pulsed magnet field with a frequency of 8Hz and the intensity of 80 m T to receive treatment and the therapeutic method is called magnet therapy. The time of the therapy was 30 min and lasted 8 weeks. The mice in High-intensity group swam with loads every weeks and after training they were put into pulsed magnet field with a frequency of 8Hz and the intensity of 120 m T to receive treatment and the therapeutic method is called magnet therapy. The time of the therapy was 30 min and lasted 8 weeks.Detection Key indicators: Weight,the last three weeks swimming time, blood lactate(LA) concentrations, creatine kinase(CK) activity, lactate dehydrogenase(LDH) activity, blood urea nitrogen(BUN) concentrations and skeletal muscle malonyl ketone(MDA), superoxide dismutase(SOD) activity.Research results:After 5 week’s swimming training, compared to swimming group, High-intensity group had obviously longer exhaustive swimming time(P<0.01) in the sixth, seventh and eighth week. And the duration of loaded swimming to exhaust of Low-intensity group were remarkably prolonged compared to High-intensity group(P< 0. 05).In the sixth week, the average weight of mice in swimming group were lighter than normal group and presented obvious difference. In addition to that, the weight of mice in swimming group, Low-intensity group and High-intensity group were lighter than before in the seventh week and in the eighth week the mouse’s weight in swimming group lost significantly.In the eighth week the concentration of LA(lactic acid) of normal group was the lowest and had the obvious difference compared with other 3 groups(P<0.05). Just after the burden swimming training, the concentration of LA of swimming group’s, Low-intensity and Low-intensity group are.significantly higher than that of normal group(P<0.01). Among the swimming, Low-intensity and High-intensity groups, swimming group’s concentration is the highest and there were no obvious differences among these three groups(P>0.05). After the training, except the swimming group, the mice in Low-intensity and High-intensitygroup were put into pulsed magnet field to receive magnet therapy. In the 15 th minutes, the concentration of LA of normal group is the lowest, followed by Low-intensity, High-intensity and swimming group. At the same time, there was obvious difference between Low-intensity and swimming group(P<0.05). In the 30 th minutes, the concentration of LA of normal group is the lowest, followed by Low-intensity, High-intensity and swimming group. At the same time, there was obvious difference among Low-intensity, High-intensity and swimming group(P<0.05).The activity of creatine kinase(CK) and lactic dehydrogenase(LDH) as well as the concentration blood urea nitrogen(BUN) and MDA in the serum of swimming group’s mice are higher than that of normal group( P<0.01).The activity of creatine kinase(CK) and lactic dehydrogenase(LDH) as well as the concentration blood urea nitrogen(BUN) and MDA in the serum of swimming group’s mice are higher than that of Low-intensity and High-intensity groups. And the activity CK and LDH as well as the concentration BUN and MDA in the serum of Low-intensity and High-intensity groups’ mice are higher than that of normal group. In addition, the activity of CK and LDH as well as the concentration MDA in the serum of Low-intensity group’s mice are higher than that of High-intensity group.The activity of superoxide dismutase(SOD) of swimming group in skeletal muscle is obviously lower than that of Low-intensity and High-intensitygroup. And the activity of superoxide dismutase(SOD) of High-intensity group in skeletal muscle is higher than that of Low-intensity group. The data of all groups have statistical significance.Research conclusions:1. The stimulation of pulsed magnet field will accelerate the elimination of body’s garbage, which helps anti-fatigue.The stimulation of pulsed magnet field will strengthen the capacity of free-radical defense system of the mice and accelerate the elimination of free radical. The pulsed magnet field could protect the intact of the cells and make it function well.2. The stimulation of pulsed magnet field can reduce the damage to cells of skeletal muscle and relieve sports fatigue.3. To some extent, the effect of pulsed magnet field with an intensity of 120 m T is better than that with 80 m T in terms of relievingperipheral fatigue... |
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