Abstract Summary
The strength characteristics of the knee and ankle muscles of high-level athletes have positive significance for better design of exercise training programs and prevention of sports injuries. Taking the Chinese men's volleyball players as the research object, it is found that the balance of the maximal muscle strength of the muscles on both sides of the knee and ankle of Chinese men's volleyball players is poor. Especially at slow speeds, there is a large gap between the knee flexion and extension, the ankle joint flexion and dorsiflexion. These factors may cause an important injury to the knee and ankle joints, which should be highly valued during training; The strength M between Chinese men's volleyball players is large, and the strength of a considerable number of athletes is below average
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