| Research Objectives:The study tries to probe exercise influence of physical fitness of the Middle-aged knee joint. This article from the theoretical and practical perspective discusses exercise capacity. For example: speed, strength, stamina, agility and flexibility. And they are alterative to sports. His conclusions are based on actual evidence and experimental result, thus, the result can offer references for the future studies and researches concerned.Method:The study is about middle-aged men and women the man will divide into two groups. The group is to exercise regularly. The anther is not, and the women as well. making use of iskinetic test training and 3-D force platform survey test and control group, and evaluate physical quality of sports ground. We obtain kinematics characteristic of knee joint and some measuring results of sport quality of lower limbs. Using theoretical analysis and the statistic arrange and analyze the result, thus, combining some of the research and using the theory of biomechanics of sports, Body Structures and athletic Training probe main joint of lower joint- knee joint. Thus analyzing what affect essential factor of sport quality of lower limbs.Results and Analyses: Muscle strength: Experimental group is more than control group about the date of PT, PT/W, TW and MW of the female in concentric contraction, eccentric contraction and isometric contraction.So the muscle of experimental group does work strong. Male is as well as female. But two groups present significant difference in flex of concentric contraction. Meanwhile, the result of extend is different from foregone experts about the dominical study. It vary with angular speed which is not evident. But the four values don't vary more evident in eccentric contraction. Therefore muscle strength of the male is that humans how keeping fit is better than humans how no keeping fit. Finding regularity of them is very difficult. female and male present big in the value of TW and MW ,when angular speed of the measure is 120°/s.So it proving that they work strong. Indicators of power, speed by vertical jump of the test: PT and MH (max-height), all date present that two groups have significant difference. Following humans how not keeping fit enters co senescence gradually, explosive power turn up decline history according to the date.⑵harmony: For the Concentric and eccentric contraction, we can sum that the group of physical training is bigger than not the group of physical training for F/E. so we consider that their balancing ability is better. But the date has above 0.8 in between 180°/s and 240°/s in . We thought that the condition is vulnerable intrinsic muscles. They lose easily balance in concentric contraction. Especially, most of them is above 1.2 in eccentric contraction. The value is beyond normal range. The result of the male: the male is better than the female about harmony in concentric contraction. But they are not significant difference. Four groups are very bad in eccentric contraction Therefore their harmony of concentric contraction is better than eccentric contraction.⑶stamina: Looking form WF, TW and MW, energy of the exercise people is stronger than no exercise people. But, they fell faster than the adolescence and athlete. They decrease nearly double ness. Therefore, it is in a better position. It is unilateral. By and large, their muscular strength and muscular endurance drop quickly.⑷flexibility: their flexibility is level 1 is the worst. Their value is less than 1.the article point out that the flexibility of the men is worse than the women. And they have significant difference.⑸agility and speed: Their agility and speed decreases quickly, particularly, the value of the female drag for 1.33.They which is level 2 is the worst. So they need take more exercise. Each aspect is declining. The difference is only the decline rate difference. A trend of them : flexibility |
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