Gastrocnemius And Soleus Muscle Sound Properties Of Different Exercise Load

Research objectives:With the development of society, the modern sports not just depend on competitive strength of country,but modern science and technology capacity. If we want to improve athletic performance and issue a challenge the limit of sports, we also should depend on the power of modern science and technology. At present, sports scientific research involve many fields, for example physiology, bio-mechanics, physics, kinematics and nutrition and so on. we can synthesize research findings in various fields and use its in training and competition.So the coach is not only depend on experience but also scientific analysis to guide the athlete's training and arrange the training exercise for every athlete more scientifically and reasonably in order to make athletes play to the best standard. Human body movements are achieved through muscle contraction and relaxation of this activity changing in the strength or length. Therefore, muscle strength training for athletes is a crucial role in the improvement of sports performance. Load impact the effect of training directly.Gastrocnemius and soleus muscle are very important leg muscles.So their characteristic affect the improvement of many sports programmes athletes' performance, such as track and field, high jump, etc. In this article by studying the characteristics of gastrocnemius and soleus muscle 'sound on the the different load, to find a good parameter to reflect whether the exercise load is not appropriate, and then to guide sports training.Research content:10 healthy male college students were engaged in no-load, load 10kg, load 15kg, load 20kg, load 25kg, load 30kg of.Using time domain analysis and wavelet packet method and approximate entropy theory to analyze the characteristics of the signal.Research result:In mention chung sports,gastrocnemius and soleus muscle acoustic signal amplitude and energy decrease with the load increasing. Relative to the soleus muscle, the gastrocnemius' muscle acoustic signal energy decreased faster.On th load of 25kg and 30kg, soleus'muscle acoustic signal energy reduce fluctuationly and slowly.Gastrocnemius and soleus muscle, muscle acoustic signal energy concentrated in the 0-12.5Hz band with every load, accounted for about 50% percentages. The higher the frequency spectrum, the smaller the percentage of signal energy.compared with 0 and 30kg load, gastrocnemius muscle acoustic signal energy percentage reduce more than soleus'. Gastrocnemius'is 0.046,but soleus'is 0.0234.Using approximate entropy analysis the results shows that with increasing load the gastrocnemius and soleus muscle acoustic signal'approximate entropy increases.Compared with gastrocnemius and soleus muscle, gastrocnemius muscle acoustic signal' approximate entropy increases faster,but Soleus muscle acoustic signal' approximate entropy increase more gently. When the load of 25kg and 30kg, the soleus muscle acoustic signal' Approximate entropy is almost no increase.Conclusion:To some extent,Approximate entropy reflect muscle fiber recruitment situationt during muscle contraction with loads. Muscle sound'approximate entropy can not increased indefinitely with the load, when reached a certain value, may become stable.